CN116445829A - 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

A kind of anti-corrosion anchor rod and its production process

technical field

The invention relates to the technical field of metal product processing, in particular to a corrosion-resistant anchor rod and a production process thereof.

Background technique

Due to the special underground environment of coal mines, rock formation water often seeps into the roadway, and the rock formation water contains certain salts and alkaline substances, which will affect the supporting materials such as anchor rods and anchor cables in the mine. Severe corrosion will destroy the strength of the support structure and increase the hidden dangers in the safety of coal mines. Therefore, it is extremely important to study the anti-corrosion of metal bodies in coal mines. According to the analysis of the corrosion mechanism, the corrosion of the anchor rod is mainly due to the electrochemical corrosion in contact with the external medium; in addition, under the action of high ground stress, the influence of corrosion on the anchor material is strengthened, which will cause the service time of the anchor material to decrease or even decrease. Premature failure, especially for bolts under high stress conditions, is prone to stress corrosion in corrosive environments leading to premature failure.

Corrosion-resistant bolts are an important invention to prevent underground safety accidents. At present, most bolts are severely corroded due to the high salt, high humidity, and high water spray conditions underground, and will fail prematurely after long-term use.

Contents of the invention

One of the objectives of the present invention is to provide a corrosion-resistant anchor rod, which not only meets the requirements of anti-corrosion, but also meets the chemical composition and physical performance requirements of the GB/T 35056-2018 standard, and solves the problem of existing anchor rods. The problem of severe corrosion of rods downhole.

The technical scheme of a kind of anti-corrosion bolt of the present invention is as follows:

A kind of anti-corrosion bolt, 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 object of the present invention is to provide a production process of anti-corrosion anchor rod, optimize the production process of the anchor rod, improve the strength, oxidation resistance, machinability, tensile strength, stability, etc. of the anchor rod material , At the same time, the production process can be quickly and flexibly produced according to customer needs to meet the different needs of customers.

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

A production process of an anti-corrosion bolt, comprising 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 ferrochrome and high-carbon ferromanganese; the primary molten steel is first smelted in the oxidation period, and then smelted in the reduction period. After reduction, add slagging agent to make slagging, and add fine-tuning components to fine-tune the target components, then tap the steel to obtain refined molten steel. After cooling and stirring, cut to obtain slabs;

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

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

(4) Intermediate rolling, rolling the round steel II with the defect removed into round steel III, straightening the round steel III, and measuring its length and diameter;

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

(6) For the finished product, cut the rebar, cut the oblique point at the tail, and then cool it to room temperature; Finished product is obtained by thread rolling.

Preferably, in step (1), steel scrap, nickel and alloys are added to the electric furnace for smelting, the tapping temperature for smelting during smelting is 1635-1685°C, and the chemical composition of the crude molten steel in the electric furnace reaches C 0.19-0.30%, 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%. Obtain primary molten steel.

Further preferably, in step (1), the initial smelting molten steel is smelted in the oxidation stage first, wherein air is blown into the refining furnace at a rate of 13-20m ³ /min during the oxidation stage to reduce the phosphorus content to below 0.03%. And the liquid steel is evenly heated and heated, and then smelted in the reduction period, in which ferrosilicon and aluminum with a mass ratio of 9:1 are added to the refining furnace during the reduction period, and nitrogen is blown in at a rate of 6-10m ³ /min. The sulfur content is reduced to below 0.03%, and then add slagging agent to make slagging, and add fine-tuning components to fine-tune the target components, and then tap the steel to obtain refined molten steel; among them, the slagging agent is composed of lime with a mass ratio of 10:3 and fluorite, the fine-tuning composition is composed of manganese and ferrochrome 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%, 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 the furnace is 1010-1090°C; the square steel billet is rolled 15 times with a rolling mill to form a φ45mm round steel I, and then the round steel I is cooled by cold water shower to 855-875°C.

Further preferably, in step (3), the round steel I after the cold water shower is rolled 5 times with a horizontal rough rolling mill to form a φ35mm round steel II; the head defects and Tail defects were resected 200 ~ 300mm.

More preferably, in step (4), the round steel II with the defect removed is rolled 5 times in an intermediate rolling mill to form a round steel III with a diameter of φ25 mm, 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 diameter reduction ratio is as follows:

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

More preferably, in step (5), the straightened round steel III is placed in a cold water spray cooling system for 3 seconds and then removed, and the temperature reduction range of the round steel III after removal is 75~85°C; cold water spray cooling The water flow nozzle of the system is arranged along the length direction of the round steel III, and is 1cm away from the round steel III; the water flow rate of the cold water jet cooling system is kept at 25-30m ³ /h, and the pressure is 0.3-0.5MPa.

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

Preferably, in step (6), the rebar is cut with double ruler scissors; the tail of the rebar is cut obliquely, cooled to normal temperature, and then the head of the rebar is necked by a rounding machine, so that There is no transverse rib on the surface of the head, and it becomes a round head. Then, the rounded part of the rebar head is rolled by a thread rolling machine to make a finished product; the finished product is inspected before packaging.

The role of elements

Ni: It can not only improve the strength of the anchor rod, but also maintain good plasticity and toughness. Ni can enhance the corrosion resistance of the bolt in acid-base environment, enhance the oxidation resistance, realize the anti-rust effect, reduce the formation of Fe ferrite, and significantly reduce the tendency of σ phase formation.

Cr: It can significantly enhance the oxidation resistance and corrosion resistance of the anchor rod. A certain content of Cr can enhance the strength and hardness of the material, and can also improve the impact toughness and wear resistance of the material, and can also enhance the rust resistance and corrosion resistance of the material. Corrosion, Cr promotes the passivation of the material and keeps the material in a stable passive state. The effect of Cr on the structure is that Cr is an element that strongly forms and stabilizes iron body and reduces the austenite zone.

Cu: It can enhance the machinability of the bolt, improve the atmospheric corrosion resistance of the material, improve the stability of austenite in the material, strengthen the ferrite, and improve the corrosion resistance in reducing media.

Si: It can significantly strengthen ferrite and has a strong solid capacity strengthening effect. It can significantly increase the tensile strength of steel, slightly increase the yield strength of steel and reduce the plastic toughness. The addition of Si can form a dense _SiO2 protective film on the surface of the material to prevent further corrosion of the anchor rod by the corrosive medium. The addition of silicon can also passivate the matrix 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 bolt and cable.

V: Belongs to transition group elements. When transition group element atoms interact with C atoms, they can form metal bonds and covalent bonds. V is not only a deoxidizer but also a strengthening element for alloys. It is known as the vitamin in alloys. , by adding V, the strength, toughness and other properties can be improved.

Mo: It can effectively improve the stability of anchor rods and 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 chloride ions and organizes Graphitization is eliminated and the SiO ₂ protective film is strengthened.

Beneficial effect

The composition and mass percentage of the bolt 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 rod by adjusting the effective components in the anchor rod, optimizes the production and processing technology of the anchor rod, and improves the strength, oxidation resistance, Machining performance, tensile strength, stability, etc., based on the performance of conventional bolts, not only meet the anti-corrosion requirements, but also ensure that the prepared bolts meet the technical specifications for coal mine roadway bolts GB/T 35056-2018 standard The requirements of chemical composition, tensile strength and elongation rate solve the problem of severe corrosion of existing bolts in the well.

Description of drawings

Fig. 1 is the schematic diagram of anchor rod in the embodiment 1 of the present invention;

Fig. 2 is the bolt accelerated corrosion electrolytic test device of the present invention;

Fig. 3 is the topography of the anchor before and after corrosion in Example 1 of the present invention, wherein a is the topography of the anchor before electrolytic corrosion in Example 1 of the present invention, and b is the electrolytic corrosion of the anchor in Example 1 of the present invention After the topography, c is the topography of the bolt for raw mine before electrolytic corrosion; d is the topography of the bolt for raw mine 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 by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

One, the specific embodiment of anti-corrosion bolt of the present invention is as follows:

Example 1

A kind of anti-corrosion bolt, 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 bolt, 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

A corrosion-resistant anchor rod, 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 bolt, 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%.

Two, the specific embodiment of the production technology of anti-corrosion bolt of the present invention is as follows:

Example 4 (cold shower to 867°C)

A production process of an anti-corrosion bolt, comprising the following steps:

(1) Smelting billets

Electric furnace smelting, adding scrap steel, nickel and alloys (the alloys are high-carbon ferrochromium and high-carbon ferromanganese) into the electric furnace for smelting, the tapping temperature of the smelting is controlled at 1635-1685°C during smelting, and 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% of the standard is tapped to obtain primary molten steel;

Refining in an argon-oxygen refining furnace, the primary molten steel is first smelted in the oxidation period, in which air is blown into the refining furnace at a rate of 13-20m ³ /min during the oxidation period to reduce the phosphorus content to less than 0.03%, and to make the molten steel Heating evenly, and then smelting in the reduction period, in which ferrosilicon and aluminum with a mass ratio of 9:1 are added to the refining furnace during the reduction period, and nitrogen is blown in at a rate of 6-10m ³ /min to reduce the sulfur content to 0.03% or less; after reduction, add a slagging agent to make slagging, and add fine-tuning components to fine-tune the target components, then tap out to obtain refined molten steel, which is cooled and stirred, and cut to obtain slabs; wherein, the slag-forming agent is made of Composed of lime and fluorite with a mass ratio of 10:3, the fine-tuning composition is composed of manganese and ferrochromium nitride with a mass ratio of 8:3, and the target composition is C 0.21-0.25%, Si 0.39-0.43%, 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) Billet opening, the slab is poured into a pusher type heating furnace, the furnace temperature is 1010-1090°C, and it is released into a square billet; the rolled square billet is rolled 15 times by a rolling mill, and rolled into a φ45mm round steel, Since the reduction in rolling temperature is less, round bar I will be cooled to 865°C ± 10°C with a cold shower.

(3) Rough rolling, the φ45mm round steel I after the cold water shower is rolled 5 times with a horizontal rough rolling mill, and rolled into φ35mm round steel II; the head and tail defects of the round steel II are cut off with an anchor shearing machine, of which , the excision length of the head defect of the round steel II is 200-300 mm, and the excision length of the tail defect of the round steel II is 200-300 mm.

(4) Intermediate rolling, the φ35mm round steel II with the head and tail defects removed is rolled 5 times by the intermediate rolling mill, and the intermediate rolling mill reduces the roundness of the round steel II, and rolls 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 steel III, and measure the length and diameter of the round steel III to ensure the quality of the round steel III;

(5) For finishing rolling, a cold water jet cooling system is installed before the finished product rolling. The water flow nozzle is arranged along the direction of the anchor rod and is 1cm away from the anchor rod. The water flow rate is kept at 25-30m ³ /h, and the pressure is 0.3-0.5 MPa; After the φ 25mm round steel III entered the cold water injection cooling system, it was cooled in this cooling system for 3 seconds and then moved out quickly, cooling in this 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 round steel III after phosphorus removal is sent to the finishing rolling mill for rolling. After the second rolling mill, the second rolling mill contains patterned rolls and rolls them into φ20mm rebar.

For the finished product, cut the threaded steel according to the required size with double ruler scissors, and cut the tail of the threaded steel obliquely, and cool it to room temperature; then, use a rounding machine to shrink the head of the threaded steel to make the surface There are no more transverse ribs, and it becomes a round head; then the thread rolling machine is used to roll the rebar with the rounded head to make the finished rebar. If the rebar transverse rib is not flattened, it is easy to jump the knife; finally, Check whether the finished rebar is qualified, and can be packaged only after passing the qualification.

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%, Sn 0.002～0.009%, Sb 0.003～0.008% and As0.001～0.007%.

The anchor rods in the above-mentioned embodiments 1-3 are also produced by the production process of embodiment 4.

Characterization and analysis of anti-corrosion performance of bolt

(1) Purpose of the test

According to the analysis of the corrosion mechanism and main corrosion influencing factors of bolts in a mine area, it can be seen that the corrosion of bolts by chloride ions in mine water is the most significant. In order to test the corrosion resistance of the bolt material, the bolt was tested through an electrolysis test, and the enhanced corrosion solution obtained by magnifying the concentration of chloride ions by 5 times on the basis of simulated mine water was used as the electrolyte to observe the corrosion of the bolt and analyze the corrosion of the bolt. Corrosion resistance of the rod. The anchor rod of Embodiment 1 of the present invention is shown in FIG. 1 .

(2) Test device and principle

This experiment adopts the self-made bolt accelerated corrosion electrolysis test device, which mainly includes reaction tank, electrolyte (the electrolyte is mainly 350mg/L chloride ion solution), wire, DC power supply, liquid container, anchor specimen and graphite electrode . The electrode of the anchor rod specimen and the graphite electrode are energized by a DC power supply, so that the anchor rod specimen undergoes an electrochemical reaction in the electrolyte, and the corrosion rate of the anchor rod specimen is accelerated. After the assembly is completed, measure the resistance of the electrolysis 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 is convenient for observing the electrolytic reaction process and electrode changes. The bolt accelerated corrosion electrolytic test device is shown in Figure 2.

(3) Test plan

Use the enhanced corrosion solution obtained by magnifying the chloride ion concentration by 5 times on the basis of simulated mine water as the electrolyte, place the electrode made of the anchor rod and the graphite electrode in the reaction tank with the electrolyte, connect the line, and pass the DC power supply Provide a stable 2A current to the anchor rod sample electrode and graphite electrode, electrolyze for 15 hours, then take out the sample and observe the corrosion of the anchor rod.

(4) Analysis of corrosion morphology of bolt

After the electrolysis of the bolt is completed, the test piece is taken out, after removing the appendages, it is derusted and dried, and the corrosion of the test piece is recorded by taking pictures. The morphology of the specimen before and after corrosion is shown in Fig. 3.

To observe the corrosion of the anchor rod test piece:

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 dark after corrosion, the surface is flat but has black spots, and the overall corrosion is mainly pitting. The corrosion depth of each point is shallow, mostly rust spots, and the corrosion pits are small in size and small in number. The overall corrosion of the anchor rod is uniform and small, 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 rock bolt specimens used in raw mines are yellowish-brown overall, with rough surfaces, and localized corrosion is the mainstay, and the corrosion pits are widely distributed and large in size as a whole. Corrosion is serious in some positions, and obvious loss of cross-sectional area occurs, the diameter of the rod body is obviously reduced, and the size fluctuation is uneven.

Contrast the electrolytic corrosion situation of the bolt made by the present invention and the bolt for raw mine under the chloride ion enhanced electrolyte, the corrosion degree of the bolt of the present invention is far less than the bolt for raw mine, and the local corrosion is lighter, the bolt The diameter of the rod body is very consistent, 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 Example 1 of the present invention is completed, the anchor rod is taken out, the wire and other appendages are removed, rust removal and drying are carried out, and then it is weighed. By comparing the quality of the anchor before and after the test, the quality change of the anchor can be obtained. The quality of anchor rods before and after spot corrosion is shown in Table 1.

Table 1 Quality comparison of bolts before and after electrolytic corrosion

As can be seen from Table 1, by comparing the mass loss situation of the bolt of the present invention and the ore bolt, the mass loss rate of the bolt of the present invention is significantly reduced, from 5.42% to 1.03%, as increasing the test time, the decline will be further increase.

A comprehensive comparison of the appearance change and quality loss of the bolts of the present invention and the bolts used in raw mines shows that the corrosion degree of the bolts of the present invention is obviously lighter than that of the bolts used in raw mines. To sum up, the anchor rod of the present invention has outstanding corrosion resistance and obvious advantages.

The tensile strength of the bolt with a diameter of 20mm obtained by the above process is at least 12t, and the elongation is not less than 15%. The bolt of the present invention complies with the chemical composition, tensile Strength and elongation requirements.

As can be seen from the above technical solutions, the anti-corrosion bolt of the present invention and its production process, compared with the prior art production process and products, have played an anti-corrosion effect, and can reduce the occurrence probability of downhole safety accidents, and can simultaneously According to customer needs, quickly and flexibly produce anchor rods that meet different customer needs.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A corrosion-resistant bolt, characterized in that its composition and mass percentages 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%. 2. A production process of an anti-corrosion bolt as claimed in claim 1, characterized in that, comprising 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 ferrochrome and high-carbon ferromanganese; the primary molten steel is first smelted in the oxidation period, and then smelted in the reduction period. After reduction, add slagging agent to make slagging, and add fine-tuning components to fine-tune the target components, then tap the steel to obtain refined molten steel. After cooling and stirring, cut to obtain slabs; (2) Open billet, put the slab into the heating furnace, and make square steel billet out of the furnace; roll the square steel billet into round steel I, and then shower with cold water; (3) Rough rolling, rolling the round steel I after the cold water shower into round steel II; cutting off the head defects and tail defects of the round steel II; (4) Intermediate rolling, rolling the round steel II with the defect removed into round steel III, straightening the round steel III, and measuring its length and diameter; (5) Finish rolling, the straightened round steel III is cooled first, then dephosphorized, and then rolled into rebar; (6) For the finished product, cut the rebar, cut the oblique point at the tail, and then cool it to room temperature; Finished product is obtained by thread rolling. 3. The production process of anti-corrosion bolt according to claim 2, characterized in that, in step (1), steel scrap, nickel and alloys are added to an electric furnace for smelting, and the tapping temperature for smelting during smelting is 1635-1685° C, the chemical composition of 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%, the steel is tapped to obtain primary molten steel. 4. The production process of anti-corrosion bolt according to claim 3, characterized in that, in step (1), the primary molten steel is smelted in the oxidation period, wherein the smelting in the oxidation period is carried out to the refining furnace with a volume of 13-20m ³ Air is blown in at a rate of 1/min to reduce the phosphorus content to below 0.03%, and then smelting in the reduction period is carried out, in which ferrosilicon and aluminum with a mass ratio of 9:1 are added to the refining furnace in the reduction period smelting, and 6-10m ³ Nitrogen is blown in at a rate of 1/min to reduce the sulfur content to less than 0.03%, and then slagging agent is added to make slagging, and fine-tuning components are added to fine-tune the target components, and then the steel is tapped to obtain refined molten steel; among them, the slagging agent It is composed of lime and fluorite with a mass ratio of 10:3, and the fine-tuning composition is composed of manganese and ferrochromium nitride with a mass ratio of 8:3. The target composition is C 0.21-0.25%, Si 0.39-0.43%, 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%. 5. The production process of the anti-corrosion bolt according to claim 2, characterized in that, in step (2), the temperature of the furnace is 1010-1090°C; the square steel billet is rolled 15 times with a rolling mill, Be rolled into the round steel I of φ 45mm, then, adopt cold water shower that round steel I is cooled to 855～875 ℃. 6. The production process of anti-corrosion bolt according to claim 5, characterized in that, in step (3), the round steel I after the cold water shower is rolled 5 times by a horizontal rough rolling mill, and rolled into a round steel of φ35mm II: Remove 200-300mm of the head defect and tail defect of the round steel II by bolt shearing machine. 7. The production process of anti-corrosion bolt according to claim 6, characterized in that, in step (4), the round steel II with the defect removed is rolled 5 times by an intermediate rolling mill, and rolled into round steel III with a diameter of 25 mm , the diameter reduction 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°C. 8. The production process of anti-corrosion bolt according to claim 7, characterized in that in step (5), the straightened round steel III is placed in a cold water jet cooling system and cooled for 3 seconds before being removed, and the round steel The temperature reduction scope after III is removed is 75～85 ℃; The water flow nozzle of cold water jet cooling system is arranged along the length direction of round steel III, and is apart from round steel III 1cm; The water flow of described cold water jet cooling system remains on 25 ～30m ³ /h, the pressure is 0.3～0.5MPa. 9. The production process of anti-corrosion bolt according to claim 8, characterized in that in step (5), the cooled round steel III is placed in the first rolling mill, and the temperature of the round steel is eliminated by rolling The impact on the micro tension, and then use the second stand rolling mill with patterned rolls to roll into φ20mm rebar. 10. The production process of anti-corrosion bolt according to claim 2, characterized in that, in step (6), double-scale shears are used to cut the rebar; the tail of the rebar is cut obliquely and cooled to At room temperature, the head of the rebar is necked by a rounding machine so that the surface of the head has no transverse ribs and becomes a round head. Then, the rounded part of the rebar head is rolled by a thread rolling machine to make a finished product; Check the finished product before packing.