CN201560219U - Heat treatment equipment for low temperature alloy steel products - Google Patents

Abstract

The utility model relates to heat treatment equipment of a low-temperature alloy steel product, comprising a heat treatment system and a transportation system, wherein the transportation system is used for transporting and connecting wear-resistant alloy cast steel in the heat treatment system. Along the transportation system, the heat treatment system comprises an annealing furnace, a quenching furnace and a tempering furnace in sequence. The annealing furnace, the quenching furnace and the tempering furnace can set heating temperature and residence time, and a quenching trough which can set cooling temperature and residence time and have cooling medium as water-soluble quenching fluid is arranged between the quenching furnace and the tempering furnace. The annealing furnace, the quenching furnace, the tempering furnace or the quenching trough is also provided with a time device and a temperature device which are used for detecting the wear-resistant alloy cast steel. The equipment has simple structure and high degree of automation, and the processed wear-resistant alloy cast steel can be used for manufacturing engineering machinery equipment touching with frozen rock and permafrost.

Description

Heat treatment equipment for low temperature alloy steel products

technical field

The utility model relates to heat treatment equipment for low-temperature alloy steel products, in particular to heat treatment for wear-resistant low-temperature alloy steel products with ultra-high hardness and toughness, which can be used in field mining equipment, can be adapted to high-strength, low-temperature and other harsh environment requirements equipment.

Background technique

Wear and tear is ubiquitous in many industrial sectors and has become an important cause of equipment failure or material damage, while it also consumes a lot of energy and materials. Various engineering excavator and loader bucket teeth, various wear-resistant conveying pipes, various crusher hammer heads and jaw plates, and various track shoes made of alloy cast steel, due to working conditions such as high strength and harsh weather, Its wear is more serious.

The current technical status is that the hardness and toughness of general materials are contradictory performance indicators. Usually, the higher the hardness, the poorer the toughness, and the higher the toughness, the lower the hardness. One is to emphasize the high toughness of the material, and the other is to emphasize the wear resistance of the material. And can't reach an effective unification, especially be used for the application on engineering machinery such as outdoor mining, excavation. The wear resistance of high manganese steel is conditional, and its yield strength is low and easy to deform; low and medium alloy wear resistant steel has better strength and toughness, and its wear resistance under low and medium impact loads is better than that of high manganese steel , but there are problems of low hardenability and hardenability, and poor wear resistance; the structure of high-chromium cast iron contains more than 20% of high-hardness eutectic carbides, which has excellent wear resistance, but there are high content of alloying elements, High production cost and high temperature heat treatment are prone to deformation and cracking; ordinary white cast iron and low-alloy white cast iron carbides have low hardness, carbides are distributed continuously, and are brittle. They are easy to peel off or even crack during use.

In view of the current situation, solve the contradiction between increasing hardenability and alloying element content, and obtain a simple production process, low cost, high strength and toughness, good hardenability and hardenability, and no pollution, while ensuring good work in low temperature environments. , and the wear-resistant alloy cast steel that can be used well in multiple industrial and mining conditions has become a technical problem. At the same time, it is also recognized that providing a new heat treatment process compatible with the alloy composition of wear-resistant alloy cast steel is not only a technical link in the manufacture of wear-resistant alloy cast steel, but also a reasonable heat treatment process will also affect wear-resistant alloy cast steel It has a positive effect on mechanical properties such as hardness and toughness and reducing or eliminating stress; it improves the distribution and existence of alloying elements in the structure, so that the alloy components can be used more effectively. As the automation requirements of modern enterprises, corresponding automation equipment should also be equipped to realize the above heat treatment process.

Utility model content

In order to solve the above technical problems, the utility model provides a heat treatment equipment for low-temperature alloy steel products, which includes: a heat treatment system and a transportation system for transporting and connecting the wear-resistant alloy cast steel between the heat treatment systems, and the heat treatment system There are sequentially along the transportation system: an annealing furnace, a quenching furnace, and a tempering furnace that can set the heating temperature and residence time, and there is also an annealing furnace that can set the cooling temperature and residence time between the quenching furnace and the tempering furnace. 1. A quenching tank with water-soluble quenching liquid as the cooling medium is installed; the annealing furnace, quenching furnace, tempering furnace or quenching tank is also provided with a time device and a temperature device for detecting the wear-resistant alloy cast steel in it.

The utility model has the advantages of high degree of automation, convenient remote and on-site process control for the whole process, and ensures the smooth progress of the heat treatment process. At the same time, because the quenching tank with water-soluble quenching liquid is used, it also ensures the advantages of environmental protection.

Description of drawings

Figure 1 is a schematic diagram of the present heat treatment equipment.

Detailed ways

The utility model provides a heat treatment equipment suitable for a new type of wear-resistant alloy cast steel, wherein the chemical composition and mass percentage of the cast steel are: C: 0.27-0.32; Mn: 0.70-0.90; Si: 0.90-1.30 ; Cr: 1.40-1.80; Mo: 0.10-0.20; Ni: 0.10-0.20; Ti: 0.02-0.03. The main functions of each alloy are:

Carbon (C): The higher the carbon content, the higher the strength and hardness of the steel, and the lower the plasticity and toughness;

Silicon (Si): Strengthen ferrite, increase tensile strength and yield strength, improve heat resistance and corrosion resistance, reduce toughness and plasticity;

Manganese (Mn): Improves strength, hardness and wear resistance;

Chromium (Cr): reduces the thermal conductivity of steel and improves wear resistance;

Molybdenum (Mo): Strengthen ferrite, improve high temperature performance and improve brittleness;

Nickel (Ni): expands the austenite zone, is an effective element for austenitization, improves strength without significantly reducing plasticity, and has good corrosion resistance;

Titanium iron (Ti): can strengthen ferrite, deoxidize and refine grain;

The equipment for heat treatment of the above wear-resistant alloy cast steel is:

1. Annealing furnace 1: the temperature can be set to 850°C-900°C, and the residence time can be set to 3-5 hours in the annealing furnace 1; the wear-resistant alloy cast steel 8 is placed at a temperature of 850°C-900°C In the annealing furnace 1, heat insulation 3-5 hour is released from the furnace, then as for the first air cooling place 1, carry out the first air cooling;

The annealing furnace used in the preferred embodiment is a pusher type annealing furnace, such as RJT-150-8 pusher type isothermal annealing furnace, which is divided into 7 heating zones, and the temperature of each heating zone is set at 850°C-900°C. A plurality of wear-resistant alloy cast steel 8 workpieces that are prefabricated to the size of the annealing furnace 1 pass through the above-mentioned 7 heating zones in batches, are heated up, and are kept warm in the above-mentioned 7 heating zones sequentially and continuously. In order to make the wear-resistant alloy cast steel 8 obtain an effective length of holding time in the annealing furnace. The number of heating zones can also be other numbers, and one of the basis for determining it is to adapt to the required heating time of the workpiece, so as to ensure the heating requirement of the workpiece and the requirement of large-scale continuous production.

At the same time, in order to achieve the purpose of automatic production and more effective control of the annealing process, a temperature monitoring device 9 can be provided in the above-mentioned 7 heating zones to realize temperature display, recording and remote reporting, and further realize the temperature control of the annealing furnace. Adjust in time. Preferably, the heating zone 1, 2, 3, 4 and 5 adopts TCW-32A three-phase voltage regulation, the temperature in zone 6 and 7 is indicated by a digital display, and each zone has an EL-100-60 multi-point recorder to display and record temperature . Wear-resistant alloy cast steel 8 comes out of the furnace after being incubated for 3-5 hours, then as for the first air cooling place 1, carries out air cooling for the first time.

2. Quenching furnace 2 and quenching tank 7: the temperature can be set to 900°C±10°C, and the residence time can be set to 150 minutes for quenching furnace 2; after cooling, the product temperature is set to 300°C, and the cooling medium is water-soluble The quenching tank 7 of the quenching liquid 3; the above-mentioned wear-resistant alloy cast steel 8 that has been air-cooled for the first time is placed in the quenching furnace 2 whose temperature is controlled at 900°C±10°C and kept for 150 minutes, then taken out and placed in the quenching tank 7 for quenching, and cooled The medium is a water-soluble quenching liquid 3, and the wear-resistant alloy cast steel 8 is cooled to about 300°C and then transported out of the quenching tank 7.

A preferred embodiment adopts a cast chain plate type quenching furnace, which consists of 5 heating zones, and the temperature of each heating zone is controlled to 900°C±10°C. After the workpiece is kept warm for 150 minutes, it is automatically placed into the quenching tank 7 for quenching. Each heating zone can be equipped with a temperature monitoring device 9 to realize temperature display, record and remote report, and further realize timely adjustment of the temperature of the quenching furnace. Preferably, each heating zone can be equipped with a digital display intelligent temperature controller master control, and a multi-point recorder can record and monitor centrally. In addition, the number of heating zones can also be other numbers, and one of the basis for determining it is to adapt to the required heating time of the workpiece, so as to ensure the heating requirements of the workpiece and the requirements of large-scale continuous production.

The cooling medium used in quenching is water-soluble quenching liquid 3. Preferably, it is equipped with a water-soluble quenching solution of 10% PVA, 1% trihexanolamine, 0.2% sodium benzoate, and 0.2% Swire oil. In order to realize further automatic production, the quenching medium system 5 connected to the quenching tank 7 can adopt a large circulation form with high automation capability, and is equipped with a special stirring function to ensure the continuous and stable supply of quenching liquid. The temperature of the quenching liquid 3 before quenching can be a normal temperature, such as below 30 degrees. The wear-resistant alloy cast steel 8 stays in the quenching liquid 3 for 8-25 minutes, and the cooling temperature of the workpiece is detected by the temperature monitoring device 9 in the quenching tank 7. When the workpiece is cooled to about 300°C, it is then lifted by the quenching tank 7 to the conveyor belt. The workpiece is sent out of the quenching tank 7 to area II, and then tempered.

3. Tempering furnace 4: Tempering furnace 4 whose temperature can be set to 200-230°C and residence time can be set to 3-4 hours; place the aforementioned quenched wear-resistant alloy cast steel 8 at a temperature of 200-230°C Put it in the tempering furnace at 4°C, keep it warm for 3-4 hours, take it out, and then put it in the second air cooling place III for air cooling.

Preferably, a mesh belt tempering furnace is used: it consists of 5 heating zones, and the temperature of each heating zone rises to 200-230 ° C, and the heat preservation is carried out for 3-4 hours. Take it out for air cooling. The number of heating zones can also be selected based on the above reasons, and each heating zone can be equipped with a digital display intelligent temperature controller master, a multi-point recorder for centralized recording and monitoring, and other temperature monitoring devices 9 to achieve temperature display , recording and remote reporting.

4. Transportation system: it transports and connects the wear-resistant alloy cast steel between the heat treatment systems, so as to realize the heat treatment process of the wear-resistant alloy cast steel.

It includes the following parts: transport the wear-resistant alloy cast steel 8 from the annealing furnace 1 to the first air cooling place I, and then to the first transport device A of the quenching furnace 2; The wear-resistant alloy cast steel 8 of the quenching furnace 2 is transported to the quenching tank 7 for cooling, and then transported to the second transport device B at the area II; the wear-resistant alloy cast steel 8 is transported to the tempering furnace 4 , and then transported to the third transport unit C of the second air cooling place III. For example, lifting devices, conveyor belts and other linear transportation devices are used.

In addition, this heat treatment equipment is also equipped with a timing device 10 for detecting the time that the wear-resistant alloy cast steel stays in the above-mentioned furnace in the above-mentioned area that needs time control, and can realize time display, recording and remote reporting, which is convenient for the whole production. Highly automated.

As a further improvement, this heat treatment equipment also has a host control unit 6, and the annealing furnace 1, quenching furnace 2, quenching tank 7, quenching medium system 5, tempering furnace 4 and transportation system in this system can pass through respectively or simultaneously. The form of wired or wireless 11 is connected with the upper control unit 6, so that the upper control unit 6 can obtain the data signal sent by the timing device 10 and the temperature monitoring device 9 in this system, and adjust the temperature and residence time in the furnace in time, And control the transportation system to cooperate with timely transportation, and finally realize the large-scale system automatic control of the whole system.

The above-mentioned heat treatment equipment has the characteristics of high degree of automation, convenient remote and on-site process control throughout the whole process, ensuring the smooth progress of the heat treatment process, and enabling the wear-resistant alloy cast steel to achieve the required mechanical properties.

After the cast steel described in the utility model is processed by the above-mentioned equipment, its tensile strength: 1500-1800MPa, yield strength: 1200-1400MPa, elongation: δ57-15%, V-shaped notch impact toughness Akv25-40J, hardness: 48- 55HRC. It is also suitable for engineering machinery and equipment in contact with frozen rock and frozen soil in low temperature environments, such as -20°C-0°C, and meets the requirements of long-term work in cold zone environments.

The various functional structures and embodiments disclosed in the utility model are embodied and protected by the claims, and any enlightenment obtained from the drawings and embodiments shown in the utility model all fall into the scope of the utility model. within the scope of protection.

Claims (2)

1. A kind of heat treatment equipment of low-temperature alloy steel product, it is characterized in that, it comprises: A heat treatment system and a transportation system for transporting and connecting the wear-resistant alloy cast steel between the heat treatment systems; The heat treatment system has sequentially along the transportation system: an annealing furnace, a quenching furnace, and a tempering furnace where the heating temperature and residence time can be set, and a cooling temperature can be set between the quenching furnace and the tempering furnace and residence time, equipped with a quenching tank whose cooling medium is a water-soluble quenching liquid; The annealing furnace, quenching furnace, tempering furnace or quenching tank is also provided with a time device and a temperature device for detecting the wear-resistant alloy cast steel therein. 2. The heat treatment equipment for low-temperature alloy steel products according to claim 1, characterized in that: the annealing furnace, quenching furnace or tempering furnace may have multiple heating zones. The annealing furnace has seven heating zones, the quenching furnace has five heating zones or the tempering furnace has five heating zones.

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