CN116445829B - Corrosion-resistant anchor rod and production process thereof - Google Patents

Abstract

The invention relates to the technical field of metal product processing, in particular to an anti-corrosion anchor rod and a production process thereof. The anti-corrosion anchor rod comprises the following components in percentage by mass: 0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As. The anti-corrosion anchor rod not only meets the anti-corrosion requirement, but also meets the chemical composition and physical property requirements of GB/T35056-2018 standard, and solves the problem of serious corrosion of the existing anchor rod under the well.

Description

Corrosion-resistant anchor and production process thereof

Technical field

The invention relates to the technical field of metal product processing, and in particular to an anti-corrosion anchor and its production process.

Background technique

Due to the special underground environment of coal mines, rock formation water often seeps into the tunnels, and the rock formation water contains certain salts, alkalis and other substances, which will cause damage to underground anchor rods, anchor cables and other supporting materials. Severe corrosion will occur, thereby destroying the strength of the supporting structure and increasing the hidden dangers in coal mine safety. Therefore, research on the anti-corrosion of underground coal mine supporting metal bodies is extremely important. From the analysis of the corrosion mechanism, it can be seen that the corrosion of anchor rods is mainly due to electrochemical corrosion caused by contact with external media; in addition, under the action of high ground stress, the impact of corrosion on anchoring materials is intensified, which will cause the service time of anchoring materials to be reduced or even Premature failure, especially for anchors under high stress, is prone to stress corrosion in corrosive environments, leading to premature failure.

Anti-corrosion anchors are an important invention for preventing underground safety accidents. Currently, most anchors are severely corroded by the high salt, high humidity, and high water leakage conditions underground, and will fail prematurely after long-term use.

Contents of the invention

One of the purposes of the present invention is to provide an anti-corrosion anchor that not only meets the requirements for anti-rust, but also complies with the chemical composition and physical performance requirements of the GB/T 35056-2018 standard, solving the problems faced by existing anchors. The problem of serious corrosion of rods underground.

The technical solution of an anti-corrosion anchor of the present invention is as follows:

An anti-corrosion anchor, its composition and mass percentage are:

C 0.21～0.25%, S 0.021～0.023%, Si 0.39～0.43%, Mn 1.01～1.06%, P 0.026～0.029%, Ni 5.5～8.4%, Cr 5.5～8.5%, Cu 0.15～0.18%, Mo 0.18 ~0.20%, N 0.18~0.20%, V 0.006~0.008%, Fe 81.76~85.83%, Sn 0.002~0.009%, Sb 0.003~0.008% and As 0.001~0.007%.

The purpose of the present invention is to provide a production process for corrosion-resistant anchors, optimize the production process of the anchors, and improve the strength, anti-oxidation performance, machining performance, tensile strength, stability, etc. of the anchor materials. , at the same time, this production process can produce quickly and flexibly according to customer needs to meet the different needs of customers.

The technical scheme of the production process of anti-corrosion anchors of the present invention is as follows:

A production process for anti-corrosion anchors, including the following steps:

(1) Smelting steel billets, smelting scrap steel, nickel and alloys to obtain primary molten steel, in which the alloys are high-carbon ferrochromium and high-carbon ferromanganese; the primary molten steel is first smelted in the oxidation phase, and then smelted in the reduction phase. After reduction, add a slagging agent to create slagging, and add fine-tuning components to fine-tune the target components before tapping to obtain refined molten steel. After cooling and stirring, the slab is obtained by cutting;

(2) Open the billet, add the slab into the heating furnace, and take it out of the furnace to make a square steel billet; roll the square steel billet into round steel I, and then shower it with cold water;

(3) Rough rolling, rolling the round bar I after cold water shower into round bar II; removing the head defects and tail defects of round bar II;

(4) Medium rolling, rolling the round bar II with defects removed into round bar III, straightening the round bar III, and measuring its length and diameter;

(5) Finish rolling, the straightened round steel III is cooled first, then phosphorus is removed, and then rolled into rebar;

(6) For the finished product, cut the rebar and cut a bevel at the tail, and then cool it to normal temperature; then, use a rounding machine to neck the head to make a round head, and then use a thread rolling machine to roll the round head part. The finished product is obtained by rolling the thread.

Preferably, in step (1), scrap steel, nickel and alloy are added to the electric furnace for smelting. The tapping temperature of the smelting is 1635-1685°C until the chemical composition of the crude molten steel in the electric furnace reaches C 0.19-0.30% and S 0.018 ~0.028%, Si0.32~0.46%, Mn 0.98~1.09%, P 0.020~0.034%, Ni 5.3~8.8%, Cr 5.2~9.0%, N 0.14~0.23%, V 0.002~0.013% when tapping steel, Obtain primary molten steel.

Further preferably, in step (1), the initially produced molten steel is first smelted in an oxidation phase, wherein air is blown into the refining furnace at a rate of 13 to 20 m ³ /min during the oxidation phase to reduce the phosphorus content to less than 0.03%. And the molten steel is evenly heated and heated, and then smelted in the reduction period. In the smelting period in the reduction period, ferrosilicon and aluminum with a mass ratio of 9:1 are added to the refining furnace, and nitrogen is blown into the refining furnace at a rate of 6 to 10 m ³ /min. The sulfur content is reduced to less than 0.03%, and then a slagging agent is added for slagging, and fine-tuning components are added to fine-tune the target components before steel is tapped to obtain refined molten steel; the slagging agent is composed of lime with a mass ratio of 10:3 and fluorite. The fine-tuning composition consists of manganese and ferrochromium nitride with a mass ratio of 8:3. The target composition is C 0.21~0.25%, Si0.39~0.43%, Mn 1.01~1.06%, and Ni 5.5~8.4%. , Cr 5.5～8.5%, Cu 0.15～0.18%, Mo 0.18～0.20%, V 0.006～0.008%.

Preferably, in step (2), the temperature of coming out of the furnace is 1010-1090°C; the square steel billet is rolled 15 times by a rolling mill to form a φ45mm round steel I, and then a cold water shower is used to cool down the round steel I. to 855~875°C.

Further preferably, in step (3), the round steel I after the cold water shower is rolled 5 times by a horizontal rough rolling mill into a φ35mm round steel II; an anchor shearing machine is used to remove the head defects of the round steel II and All tail defects were resected to 200-300mm.

More preferably, in step (4), the round steel II with defects removed is rolled 5 times by an intermediate rolling mill to be rolled into a φ25mm round steel III, and the diameter reduction ratio of the round steel III to the round steel II is 0.3 ~0.5, and the temperature after intermediate rolling drops below 850°C. Among them, the calculation formula of the diameter reduction ratio is as follows:

Diameter reduction ratio = (diameter of round bar II - diameter of round bar III)/diameter of round bar III.

More preferably, in step (5), the straightened round steel III is placed in a cold water spray cooling system and cooled for 3 seconds before being removed. After the round steel III is removed, the temperature decrease range is 75~85°C; cold water spray cooling The water flow nozzle of the system is arranged along the length direction of round steel III, and is 1 cm away from round steel III; the water flow rate of the cold water spray cooling system is maintained at ^25-30m3 /h, and the pressure is 0.3-0.5MPa.

More preferably, in step (5), the cooled round steel III is placed behind the first rolling mill, and the influence of the round steel temperature on the micro-tension is eliminated by rolling, and then the second rolling mill containing patterned rollers is used Rolled into φ20mm rebar.

Preferably, in step (6), double-length shears are used to cut the rebar; the tail of the rebar is cut into a bevel, cooled to normal temperature, and then the head of the rebar is necked using a rounding machine to make it There are no transverse ribs on the surface of the head and it becomes a round head. Then, a thread rolling machine is used to roll the rounded part of the rebar head to make a finished product; the finished product is inspected before being packaged.

The role of elements

Ni: It can not only improve the strength of the anchor, but also maintain good plasticity and toughness. Ni can enhance the corrosion resistance of anchors in acid and alkali environments, enhance oxidation resistance, and achieve anti-rust effects. It can reduce the formation of Fe elements and significantly reduce the tendency of σ phase formation.

Cr: It can significantly enhance the anti-oxidation and anti-corrosion properties of the anchor. A certain content of Cr can enhance the strength and hardness of the material. It can also improve the impact toughness and wear resistance of the material. It can also enhance the rust resistance and resistance of the material. Corrosive, Cr promotes the passivation of the material and maintains the material in a stable passive state. The influence of Cr on the structure is that Cr is an element that strongly forms and stabilizes iron, shrinking the austenite zone.

Cu: It can enhance the machining performance of the anchor, improve the material's resistance to atmospheric corrosion, improve the stability of austenite in the material, strengthen ferrite, and improve the corrosion resistance in reducing media.

Si: It can significantly strengthen ferrite and has a strong solid volume strengthening effect. It can significantly increase the tensile strength of steel and slightly increase the yield strength of steel while reducing the plastic toughness. The addition of Si can form a dense SiO ₂ protective film on the surface of the material to prevent further corrosion of the anchor by corrosive media. The addition of silicon can also passivate the base metal in the material structure, that is, the anode area, increase the electrode potential, and effectively improve the chemical corrosion and electrochemical corrosion resistance of the anchor cable.

V: Belongs to the transition group element. When transition group element atoms interact with C atoms, they can form both metallic bonds and covalent bonds. V is both a deoxidizer and a strengthening element of the alloy. It is known as the vitamin in the alloy. , strength, toughness and other properties can be improved by adding V.

Mo: It can effectively improve the stability of anchor cables in chlorine-containing media. Molybdenum can react with chloride ions to form a molybdenum oxychloride (MoO ₂ Cl ₂ ) passivation film, which improves the corrosion resistance of chlorine ions and organizes the Graphitization is eliminated and the SiO ₂ protective film is strengthened.

beneficial effects

The components and mass percentages of the anchor rod of the present invention are as follows: C 0.21~0.25%, S 0.021~0.023%, Si 0.39~0.43%, Mn 1.01~1.06%, P 0.026~0.029%, Ni 5.5~8.4% , Cr 5.5～8.5%, Cu0.15～0.18%, Mo 0.18～0.20%, N 0.18～0.20%, V 0.006～0.008%, the balance is Fe 81.76～85.83%, Sn 0.002～0.009%, Sb 0.003～ 0.008% and As 0.001～0.007%. The present invention improves the elements and their contents in the anchor by adjusting the active ingredients in the anchor, and optimizes the production and processing technology of the anchor, thereby improving the strength, anti-oxidation performance, and Mechanical processing performance, tensile strength, stability, etc., based on the performance of conventional anchors, not only meet the anti-corrosion requirements, but also ensure that the prepared anchors comply with the technical specifications for coal mine tunnel anchors GB/T 35056-2018 standards The chemical composition, tensile strength and elongation requirements solve the problem of severe corrosion of existing anchors underground.

Description of the drawings

Figure 1 is a schematic diagram of an anchor rod in Embodiment 1 of the present invention;

Figure 2 is the anchor accelerated corrosion electrolysis test device of the present invention;

Figure 3 is a morphology diagram of the anchor rod before and after corrosion in Embodiment 1 of the present invention, where a is a morphology diagram of the anchor rod before electrolytic corrosion in Embodiment 1 of the present invention, and b is a morphological diagram of the anchor rod in Embodiment 1 of the present invention before electrolytic corrosion. After the morphology, c is the morphology of the raw ore anchor before electrolytic corrosion; d is the morphology of the raw ore anchor after electrolytic corrosion.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and are not to be construed as limiting the present invention.

1. Specific examples of the anti-corrosion anchor of the present invention are as follows:

Example 1

An anti-corrosion anchor, its composition and mass percentage are:

C 0.21～0.25%, S 0.021～0.023%, Si 0.39～0.43%, Mn 1.01～1.06%, P 0.026～0.029%, Ni 5.5～8.4%, Cr 5.5～8.5%, Cu 0.15～0.18%, Mo 0.18 ~0.20%, N 0.18~0.20%, V 0.006~0.008%, Fe 81.76~85.83%, Sn 0.002~0.009%, Sb 0.003~0.008% and As 0.001~0.007%.

Example 2

An anti-corrosion anchor, its composition and mass percentage are: C 0.21%, S 0.023%, Si 0.39%, Mn 1.01%, P 0.029%, Ni 6.5%, Cr 6.5%, Cu 0.15%, Mo 0.20%, N 0.18%, V 0.008%, Fe84.78%, Sn 0.009%, Sb 0.004% and As 0.007%.

Example 3

An anti-corrosion anchor, its composition and mass percentage are: C 0.25%, S 0.021%, Si 0.43%, Mn 1.06%, P 0.026%, Ni 7.47%, Cr 8.4%, Cu 0.18%, Mo 0.18%, N 0.20%, V 0.006%, Fe81.76%, Sn 0.002%, Sb 0.008% and As 0.007%.

Example 4

An anti-corrosion anchor, its composition and mass percentage are: C 0.23%, S 0.023%, Si 0.41%, Mn 1.04%, P 0.028%, Ni 7.3%, Cr 7.6%, Cu 0.16%, Mo 0.19%, N 0.19%, V 0.008%, Fe82.8%, Sn 0.007%, Sb 0.007% and As 0.007%.

2. Specific examples of the production process of the anti-corrosion anchor of the present invention are as follows:

Example 4 (cold shower to 867°C)

A production process for anti-corrosion anchors, including the following steps:

(1) Smelting steel billet

For electric furnace smelting, scrap steel, nickel and alloys (the alloys are high-carbon ferrochromium and high-carbon ferromanganese) are added to the electric furnace for smelting. During smelting, the tapping temperature of the smelting is controlled to be 1635-1685°C. When the chemical composition of the crude molten steel in the electric furnace reaches C 0.19～0.30%, S 0.018～0.028%, Si 0.32～0.46%, Mn 0.98～1.09%, P 0.020～0.034%, Ni 5.3～8.8%, Cr 5.2～9.0%, N 0.14～0.23%, V 0.002 ~0.013% standard when steel is tapped to obtain primary molten steel;

For refining in an argon-oxygen refining furnace, the initially made molten steel is first smelted in the oxidation phase. During the oxidation phase, air is blown into the refining furnace at a rate of 13 to 20 m ³ /min to reduce the phosphorus content to less than 0.03%, and to make the molten steel Heating and raising the temperature evenly, and then smelting in the reduction period. In the smelting period in the reduction period, ferrosilicon and aluminum with a mass ratio of 9:1 are added to the refining furnace, and nitrogen is blown into the refining furnace at a rate of 6 to 10 m ³ /min to reduce the sulfur content to 0.03% or less; after reduction, add slagging agent for slagging, and add fine-tuning components to fine-tune the target components before tapping the steel to obtain refined molten steel. After cooling and stirring, the slab is obtained by cutting; wherein, the slagging agent is composed of It consists of lime and fluorite with a mass ratio of 10:3. The fine-tuning component consists of manganese and ferrochromium nitride with a mass ratio of 8:3. The target components are C 0.21~0.25%, Si 0.39~0.43%, and Mn 1.01~1.06 %, Ni 5.5～8.4%, Cr 5.5～8.5%, Cu 0.15～0.18%, Mo 0.18～0.20%, V 0.006～0.008%.

(2) For billet opening, the slab is poured into a pusher-type heating furnace, and the furnace temperature is 1010~1090°C, and it is discharged into a square steel billet; the square steel billet is rolled 15 times using a rolling mill, and rolled into a φ45mm round steel. Since the rolling temperature decreases less, a cold water shower will be used to cool round bar I to 865°C ± 10°C.

(3) Rough rolling: use a horizontal rough rolling mill to roll the φ45mm round steel I after cold water shower 5 times into φ35mm round steel II; use an anchor shear to remove the head and tail defects of the round steel II, where , the head defect removal length of round steel II is 200~300mm, and the tail defect removal length of round steel II is 200~300mm.

(4) Intermediate rolling. The φ35mm round steel II with head and tail defects removed is rolled 5 times by an intermediate rolling mill. The intermediate rolling mill reduces the rounding of round steel II and rolls it into φ25mm round steel III, round steel III and round steel II. The diameter reduction ratio is 0.3~0.5, and the temperature has dropped below 850°C at this time; straighten the round bar III, and measure the length and diameter of the round bar III to ensure the quality of the round bar III;

(5) Finish rolling: Set up a cold water spray cooling system before rolling the finished product. The water flow nozzles are arranged along the direction of the anchor rod and 1cm away from the anchor rod. The water flow rate is maintained at 25~ ^30m3 /h and the pressure is 0.3~0.5 MPa; when the φ25mm round steel III enters the cold water spray cooling system, it is quickly removed after cooling in the cooling system for 3 seconds. Cooling in the cooling system can reduce the temperature of the round steel III by 75~85°C; then, the round steel III enters the phosphorus removal box, and the dephosphorized round bar III is sent to the finishing rolling unit for rolling. After the round bar III enters the first rolling mill, the influence of the temperature of round bar III on the micro-tension is eliminated through rolling, and then enters After the second rolling mill, the second rolling mill contains patterned rollers to roll φ20mm rebar.

For the finished product, double-length shears are used to cut the rebar according to the required size, and the tail of the rebar is cut into a bevel and cooled to normal temperature; then, a rounding machine is used to neck the rebar head to make the surface of the rebar head There are no more transverse ribs and it becomes a round head; then a thread rolling machine is used to roll the rebar with a rounded head to obtain the finished rebar. If the transverse ribs of the rebar are not flattened, tool skipping is likely to occur; finally, Check whether the finished rebar product is qualified. Only when it is qualified can it be packaged.

The composition and mass percentage of the finished product are as follows:

C 0.21～0.25%, S 0.021～0.023%, Si 0.39～0.43%, Mn 1.01～1.06%, P 0.026～0.029%, Ni 5.5～8.4%, Cr 5.5～8.5%, Cu 0.15～0.18%, Mo 0.18 ~0.20%, N 0.18~0.20%, V 0.006~0.008%, the balance is Fe 81.76~85.83% and Sn 0.002~0.009%, Sb 0.003~0.008% and As0.001~0.007%.

The anchor rods in the above-mentioned Embodiments 1 to 3 are also produced by the production process of Embodiment 4.

Characterization and analysis of anchor anti-corrosion performance

(1) Test purpose

An analysis of the corrosion mechanism and main corrosion influencing factors of anchor rods in a certain mining area shows that the corrosion of anchor rods by chloride ions in mine water is the most significant. In order to test the corrosion resistance of the anchor material, the anchor was tested through an electrolysis test. An enhanced corrosion solution obtained by amplifying the chloride ion concentration by 5 times on the basis of simulated mine water was used as the electrolyte to observe the corrosion of the anchor and analyze the anchor. Rod corrosion resistance. The anchor rod of Embodiment 1 of the present invention is shown in Figure 1.

(2) Test device and principle

This experiment uses a self-made anchor accelerated corrosion electrolysis test device, which mainly includes a reaction tank, electrolyte (the electrolyte is mainly a chloride ion solution of 350 mg/L), wires, DC power supply, liquid container, anchor specimen and graphite electrode . The anchor specimen electrode and the graphite electrode are energized through a DC power supply, causing the anchor specimen to produce an electrochemical reaction in the electrolyte and accelerating the corrosion rate of the anchor specimen. After the assembly is completed, measure the resistance of the electrolytic system to keep the resistance values of each test group consistent and ensure the consistency of the test conditions. The reaction tank made of transparent material makes it easy to observe the electrolysis reaction process and electrode changes. The anchor accelerated corrosion electrolysis test device is shown in Figure 2.

(3) Test plan

An enhanced corrosion solution obtained by amplifying the chloride ion concentration by 5 times based on simulated mine water is used as the electrolyte. The electrodes made of anchor rods and graphite electrodes are placed in the reaction tank filled with electrolyte. The lines are connected and the DC power supply is used. Provide a stable 2A current to the anchor sample electrode and the graphite electrode, conduct electrolysis for 15 hours, and then take out the sample to observe the corrosion of the anchor rod.

(4) Analysis of anchor corrosion morphology

After the electrolysis of the anchor rod is completed, take out the test piece, remove rust and dry it after removing the appendages, and take photos to record the corrosion status of the test piece. The morphology of the specimen before and after corrosion is shown in Figure 3.

Observe the corrosion of anchor rod specimens:

It can be seen from Figures 3a and 3b that the overall color of the anchor rod specimen in Example 1 of the present invention is darker after corrosion, the surface is smooth but has black spots, and the overall color is mainly pitted. The depth of corrosion at each point is shallow, mostly rust spots, and the corrosion pits are small in size and few in number. The overall corrosion of the anchor rod is uniform and to a small extent, the diameter of the rod body changes very little, and the loss of cross-sectional area at each position is also small.

It can be seen from Figures 3c and 3d that after corrosion, the raw ore anchor bolt specimens are generally yellow-brown, with rough surfaces, mainly localized corrosion, and the overall corrosion pits are widely distributed and large in size. Corrosion is severe in some locations, significant cross-sectional area loss has occurred, the diameter of the rod body has been significantly reduced, and the size fluctuations are uneven.

Comparing the electrolytic corrosion conditions of the anchor rods prepared in the present invention and those used in raw ore under the chloride ion-enhanced electrolyte, it can be seen that the corrosion degree of the anchor rods in the present invention is much smaller than that of the anchor rods used in raw ores, and the local corrosion is lighter. The diameter consistency of the rod body is excellent, and the cross-sectional area loss of the anchor rod is small.

(5) Quality loss analysis and results

After the electrolysis of the anchor rod in Embodiment 1 of the present invention is completed, the anchor rod is taken out, and after removing attachments such as wires, rust is removed and dried, and then the anchor rod is weighed. By comparing the quality of the anchor before and after the test, the quality changes of the anchor can be obtained. The quality of anchor bolts before and after corrosion is shown in Table 1.

Table 1 Quality comparison of anchor bolts before and after electrolytic corrosion

As can be seen from Table 1, by comparing the mass loss of the anchor rods of the present invention and the original ore anchor rods, it is found that the mass loss rate of the anchor rods of the present invention is significantly reduced, from 5.42% to 1.03%. If the test time is increased, the decrease will be further increase.

Comprehensive comparison of the appearance changes and mass loss of the anchor rods of the present invention and the original ore anchor rods shows that the corrosion degree of the inventive anchor rods is significantly lighter than that of the original ore anchor rods. In summary, the anchor rod of the present invention has outstanding corrosion resistance and obvious advantages.

The tensile strength of the 20mm diameter anchor produced by the above process is at least 12t, and the elongation is not less than 15%. The anchor of the present invention complies with the chemical composition and tensile strength of the technical specification for coal mine tunnel anchors GB/T 35056-2018. Strength and elongation requirements.

It can be seen from the above technical solution that the anti-corrosion anchor rod and its production process of the present invention, compared with the existing production process and products, play an anti-corrosion role and can reduce the probability of underground safety accidents. At the same time, According to customer needs, we can quickly and flexibly produce anchor rods that meet different customer needs.

In the present disclosure, the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" etc. mean the specific features, structures, materials or materials described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (9)

1. The corrosion-resistant anchor rod is characterized by comprising the following components in percentage by mass:

0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 6.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As.

2. A process for producing a corrosion resistant rock bolt according to claim 1, comprising the steps of:

(1) Smelting a steel billet, namely adding scrap steel, nickel and alloy into an electric furnace to perform smelting, wherein the steel tapping temperature is 1635-1685 ℃, and tapping when the steel tapping temperature reaches 1635-1685 ℃, and when the chemical components of crude steel water in the electric furnace reach C0.19-0.30%, S0.018-0.028%, si 0.32-0.46%, mn 0.98-1.09%, P0.020-0.034%, ni 5.3-8.8%, cr 5.2-9.0%, N0.14-0.23% and V0.002-0.013%, obtaining primary molten steel, wherein the alloy is high-carbon ferrochrome and high-carbon ferromanganese; smelting primary steelmaking water in an oxidation period, smelting the primary steelmaking water in a reduction period, adding a slag former to perform slag formation after reduction, adding a fine tuning component to fine tune target components, tapping to obtain refined molten steel, cooling, stirring, and cutting to obtain a slab;

(2) Cogging, namely adding the slab into a heating furnace, and discharging to prepare square billets; rolling square billets into round steel I, and then showering with cold water;

(3) Rough rolling, namely rolling the round steel I subjected to cold water shower into round steel II; cutting off head defects and tail defects of the round steel II;

(4) Intermediate rolling, namely rolling the round steel II with the defects cut into round steel III, straightening the round steel III, and measuring the length and the diameter of the round steel III;

(5) Finish rolling, namely firstly cooling the straightened round steel III, then removing phosphorus, and then rolling into deformed steel bars;

(6) Cutting the deformed steel bar, cutting the tail part into inclined tips, and cooling to normal temperature; then, necking the head of the die by adopting a round pressing machine to form a round head, and rolling the round head by adopting a thread rolling machine to obtain the finished product.

3. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in the step (1), primary steelmaking water is subjected to oxidation-stage smelting, wherein the oxidation-stage smelting is carried out in a refining furnace at a speed of 13-20 m ³ Air is blown in at the speed of/min, the phosphorus content is reduced to below 0.03%, and then reduction smelting is carried out, wherein the mass ratio of the reduction smelting to the refining furnace is 9:1, and is 6-10 m ³ Nitrogen is blown in at the speed of/min, the sulfur content is reduced to below 0.03%, then a slag former is added for slag formation, fine adjustment components are added for fine adjustment of target components, and then tapping is carried out, so that refined molten steel is obtained; wherein, the slag former comprises the following components in percentage by mass: 3, lime and fluorite, wherein the fine tuning component comprises the following components in mass ratio of 8:3, wherein the target components comprise 0.21-0.25% of C, 0.39-0.43% of Si, 1.01-1.06% of Mn, 5.5-8.4% of Ni, 6.5-8.5% of Cr, 0.15-0.18% of Cu, 0.18-0.20% of Mo and 0.006-0.008% of V.

4. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in step (2), the tapping temperature is 1010 to 1090 ℃; rolling square billets for 15 times by adopting a rolling mill, rolling the square billets into round steel I with the diameter of 45mm, and then cooling the round steel I to 855-875 ℃ by adopting a cold water shower.

5. The process for producing the corrosion-resistant anchor rod according to claim 4, wherein in the step (3), the round steel I after cold water showering is rolled 5 times by a horizontal roughing mill to form round steel II with phi 35 mm; and cutting off the head defect and the tail defect of the round steel II by 200-300 mm by adopting an anchor rod shearing machine.

6. The process for producing a corrosion-resistant rock bolt according to claim 5, wherein in the step (4), the round steel II from which the defect is removed is rolled 5 times by a middle rolling mill to form a round steel III having a diameter reduction ratio of phi 25mm, the ratio of the round steel III to the round steel II is 0.3 to 0.5, and the temperature after the middle rolling is reduced to below 850 ℃.

7. The process for producing a corrosion-resistant rock bolt according to claim 6, wherein in the step (5), the straightened round steel III is placed in a cold water jet cooling system for cooling for 3 seconds and then is removed, and the temperature reduction range of the round steel III after removal is 75-85 ℃; the water flow nozzle of the cold water jet cooling system is arranged along the length direction of the round steel III and is 1cm away from the round steel III; the water flow of the cold water jet cooling system is kept between 25 and 30m ³ And/h, the pressure is 0.3-0.5 MPa.

8. The process for producing a corrosion-resistant rock bolt according to claim 7, wherein in the step (5), after the cooled round steel III is placed in the first rolling mill, the influence of the round steel temperature on the micro tension is eliminated by rolling, and then the deformed steel bar with a diameter of 20mm is rolled by the second rolling mill having a patterned roll.

9. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in the step (6), a screw steel is sheared by a pair of shearing machines; cutting the tail of the screw thread steel into an inclined tip, cooling to normal temperature, necking the head of the screw thread steel by adopting a round pressing machine to ensure that the surface of the head is free of transverse ribs, turning the head into a round head, and rolling the round pressing part of the head of the screw thread steel by adopting a thread rolling machine to obtain a finished product; and (5) checking the finished product and packaging.