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Preparation method for bainite, martensite and austenite complex-phase corrosion-resistant steel

A technology of corrosion resistance and austenite zone, which is applied in the field of preparation of Bemao multiphase corrosion-resistant steel, can solve the problems of difficult temperature control, large amount of martensite, and difficulty in controlling the cooling rate of large-scale production products, etc. problems, to achieve the effect of easy control and simple process

Active Publication Date: 2019-05-31
紫荆浆体管道工程股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the on-site production, especially in the heat treatment and cooling of large cross-section products, the internal temperature and the external temperature cooling rate are different. It is difficult to control the internal and external cross-section temperature of medium-temperature and isothermal products. It is difficult to solve a variety of complex wear problems with a large amount of densities

Method used

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  • Preparation method for bainite, martensite and austenite complex-phase corrosion-resistant steel
  • Preparation method for bainite, martensite and austenite complex-phase corrosion-resistant steel
  • Preparation method for bainite, martensite and austenite complex-phase corrosion-resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation process of a kind of Bemao composite anti-corrosive steel is as follows:

[0051] 1. According to the alloy mass percentage alloy of Example 1 in Table 1,

[0052] 2. After smelting the above alloy, perform online control of rolling ratio and temperature to roll 200mm billet, then perform rapid cooling to 200 degrees, and then heat up to 600 degrees for 2 hours and then cool to room temperature.

[0053] 3. Reheat the above-mentioned offline rolled products to 1200°C and hot-press with an abrasive tool to form the required product steel pipe or rail, then cool it to 650°C and keep it at room temperature for 4 hours.

[0054] 4. Heat the above-mentioned hot-formed steel products from room temperature to complete austenitization and heat preservation for 5 hours;

[0055] 5. Cool the above-mentioned steel products from austenite state directly with quenching liquid to 350 degrees, and then pile and cool to room temperature;

[0056] 6. After heating the above to 350 ...

Embodiment 2

[0059] The preparation process of a kind of Bemao composite anti-corrosive steel is as follows:

[0060] 1. According to the alloy mass percentage alloy of Example 2 in Table 1,

[0061] 2. After the above alloy is melted, the rolling ratio and temperature are controlled online to form a 300mm thick plate, then pile-cooled to room temperature, and then heated to 650 degrees for 4 hours and then cooled to room temperature.

[0062] 3. The above-mentioned offline rolled products are cold processed by mechanical equipment to make required products such as wheels and liners,

[0063] 4. The above-mentioned cold-formed steel products are heated to complete austenitization and heat preservation for 6 hours;

[0064] 5. Directly use quenching liquid to quickly cool the above-mentioned steel products from austenite state to 300°C and furnace cool to 100°C;

[0065] 6. After heating the above to 300°C for 3 hours, directly air cooling to room temperature is completed.

[0066] Obtaining effect: Th...

Embodiment 3

[0068] The preparation process of a kind of Bemao composite anti-corrosive steel is as follows:

[0069] 1. According to the alloying element mass percentage alloy of Example 3 in Table 1,

[0070] 2. After being smelted by conventional steelmaking process, it is casted by sand casting or precision casting process;

[0071] 3. Cool the castings formed by the above cast steel to 100 degrees;

[0072] 4. Reheat the above-mentioned casting products to 500±50°C for 4 hours, then heat up to 880°C for heat preservation, and then directly cool to 100°C for 4 hours with water.

[0073] 5. After heating the above to 350 degrees for 6 hours, directly air cooling to room temperature is completed.

[0074] Obtaining effect: The above process is suitable for large-section casting of corrosion-resistant steel, obtaining upper bainite and lower bainite with more martensite and more retained austenite, which is suitable for large cutting of materials, weak impact, corrosion electrochemical / chemical corr...

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Abstract

The invention discloses a preparation method for bainite, martensite and austenite complex-phase corrosion-resistant steel. The preparation method is characterized in that a few multi-alloy elements are added to mutually restrain, i.e., a structure range is obtained by widening an upper bainite structure, a thermal treatment way adopts quick-cooling from austenite to a BS point, upper and lower bainite strcutures are obtained by adopting slow-cooling temperature-varying at a medium temperature, and a martensite residual-austenite structure is obtained at equal temperature within a low-temperature range. The whole process is used for continuously producing to obtain wear-resisting steel which consists of upper and lower bainites, martensite and austenite, and the wear-resisting steel resistimpact and cutting abrasion under various environments as well as corrosion. The production process simplifies the process of controlling cooling speed, and facilitates the preparation method for thebainite, martensite and austenite complex-phase corrosion-resistant steel which is simple in large-scale control, is good in quality and is high in wear resistance.

Description

Technical field [0001] The invention relates to the technical field of metal material processing, in particular to a preparation method of Beimao multiphase wear-resistant steel. Background technique [0002] Metal wear-resistant liners and steel balls are mainly widely used in all mechanical equipment such as thermal power, iron and steel, smelting, machinery, coal, mining, chemical, cement, port and wharf companies such as conveying systems, pulverizing systems, crushing systems, etc. on; [0003] Wear mechanism-wear forms are mainly divided into: scratch friction, impact wear, chemical corrosion, and electrochemical corrosion. The factors affecting the quality of metal wear-resistant products depend on the organization and mechanical properties. At present, metal wear-resistant liners and steel balls are basically divided into three categories. The first type of high-manganese steel austenitic structure cast liners and steel balls has good plasticity, better impact resistance, ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/58C22C38/54C22C38/46C22C38/50C22C38/48C21D8/00C21D1/18
Inventor 刘鑫朱明张弛刘文利
Owner 紫荆浆体管道工程股份公司
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