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Calcined processing method for high strength alloy steel

An alloy steel, high-strength technology, applied in the field of post-calcination of high-strength alloy steel, can solve the problems of high workpiece surface hardness, long annealing heat treatment time, oxidation and decarburization of workpiece surface, etc., to improve comprehensive mechanical properties and simplify heat treatment. process, the effect of shortening the heat treatment cycle

Inactive Publication Date: 2018-05-22
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 34CrNi3Mo alloy steel is one of the high-strength alloy steels widely used in the machinery manufacturing industry. It has good comprehensive mechanical properties, good plasticity, toughness, wear resistance, corrosion resistance and certain heat resistance. Tempering stability, wide tempering temperature range, and good cold and hot workability, therefore, 34CrNi3Mo alloy steel is mainly used for gear shafts and other parts, and is especially suitable for important parts with large cross-sections, high loads and impact loads. Forgings; the traditional manufacturing method of gear shaft includes forging process, post-forging heat treatment process, machining process and quenching and tempering process, etc. However, in the actual production process, the annealing heat treatment takes a long time, which may cause the surface oxidation of the workpiece Decarburization affects the effect of the subsequent quenching and tempering treatment process, makes the surface hardness of the workpiece higher, affects the comprehensive mechanical properties of the workpiece, and cannot meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A post-calcination treatment method for high-strength alloy steel, comprising the following:

[0014] (1) Electrodeposit nano-scale zinc coating on the surface of alloy steel to obtain a zinc coating with a thickness of 15 μm. The electroplating temperature of the zinc coating is 28 ° C. After completion, heat it to 1000 ° C in a protective atmosphere, keep it warm for 40 minutes, and control cooling The speed is 40°C / hour, controlled cooling to 120°C;

[0015] The plating solution components include zinc sulfate heptahydrate 190g / L, cobalt sulfate heptahydrate 60g / L, sodium sulfate 30g / L;

[0016] (2) Heat in a walking beam heating furnace to a temperature of 1165°C in the soaking section, keep it warm for 3 hours, and then temper it in a muffle furnace with a set temperature of 200°C for 30 minutes after rapid cooling, then cool to room temperature , that is.

[0017] Wherein, the protective atmosphere is an ammonia decomposition protective atmosphere; the heating o...

Embodiment 2

[0020] A post-calcination treatment method for high-strength alloy steel, comprising the following:

[0021] (1) Electrodeposit nano-scale zinc coating on the surface of alloy steel to obtain a zinc coating with a thickness of 20 μm. The electroplating temperature of the zinc coating is 26°C. After completion, heat it to 1050°C in a protective atmosphere, keep it warm for 35 minutes, and control cooling The speed is 40°C / hour, controlled cooling to 120°C;

[0022] Plating solution components include zinc sulfate heptahydrate 140g / L, cobalt sulfate heptahydrate 80g / L, sodium sulfate 25g / L;

[0023] (2) Heat in a walking beam heating furnace to a temperature of 1150°C in the soaking section, keep it warm for 4 hours, and then temper it in a muffle furnace with a set temperature of 200°C for 30 minutes after rapid cooling, then cool to room temperature , that is.

[0024] Wherein, the protective atmosphere is pure nitrogen; the heating of the walking beam heating furnace is div...

Embodiment 3

[0027] A post-calcination treatment method for high-strength alloy steel, comprising the following:

[0028] (1) Electrodeposit nano-scale zinc coating on the surface of alloy steel to obtain a zinc coating with a thickness of 10 μm. The electroplating temperature of the zinc coating is 30°C. After completion, heat it to 950°C in a protective atmosphere, keep it warm for 45 minutes, and control cooling The speed is 40°C / hour, controlled cooling to 120°C;

[0029] Plating solution components include zinc sulfate heptahydrate 240g / L, cobalt sulfate heptahydrate 40g / L, sodium sulfate 35g / L;

[0030] (2) Heat in a walking beam heating furnace to a temperature of 1180°C in the soaking section, keep it warm for 2 hours, and then temper it in a muffle furnace with a set temperature of 200°C for 30 minutes after rapid cooling, then cool to room temperature , that is.

[0031] Wherein, the protective atmosphere is pure argon; the heating of the walking beam heating furnace is divided...

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Abstract

The invention belongs to the technical field of high strength alloy steel processing, in particular to a calcined processing method for a high strength alloy steel. The calcined processing method comprises the steps that a nanoscale zinc coating is electrodeposited on the surface of the alloy steel, and heating treatment is carried out in a step beam heating furnace. Compared with the prior art, the calcined processing method for the high strength alloy steel has the following advantages that a zinc coating is deposited on the surface of the alloy steel, and the heating treatment is carried out under the protective atmosphere, so that the obtained zinc coating is compact in crystallization, oxidation is avoided, and at the same time decarburization is effectively prevented; the step beam heating furnace and a muffle furnace are used for tempering, so that the process of the heat treatment is simplified, the period of the heat treatment is shortened, and the comprehensive mechanical property of the high strength alloy steel is improved.

Description

technical field [0001] The invention belongs to the technical field of high-strength alloy steel processing, and in particular relates to a post-calcination treatment method of high-strength alloy steel. Background technique [0002] 34CrNi3Mo alloy steel is one of the high-strength alloy steels widely used in the machinery manufacturing industry. It has good comprehensive mechanical properties, good plasticity, toughness, wear resistance, corrosion resistance and certain heat resistance. Tempering stability, wide tempering temperature range, and good cold and hot workability, therefore, 34CrNi3Mo alloy steel is mainly used for gear shafts and other parts, and is especially suitable for important parts with large cross-sections, high loads and impact loads. Forgings; the traditional manufacturing method of gear shaft includes forging process, post-forging heat treatment process, machining process and quenching and tempering process, etc. However, in the actual production pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22C25D5/50C21D1/74C21D6/00
Inventor 高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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