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A kind of heat-resistant high-strength spring steel and its production method

A production method and high-strength technology, applied in the field of metal smelting, can solve problems such as changing properties, and achieve the effects of promoting precipitation, increasing strength, and increasing dispersion

Active Publication Date: 2022-02-08
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the fact that the performance requirements of spring steel in many existing workplaces are getting higher and higher, and the existing spring steel cannot meet the problems of use in these occasions, the present invention provides a heat-resistant high-strength spring steel and its production method, adding a variety of elements to change the performance of steel to meet the high performance requirements

Method used

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  • A kind of heat-resistant high-strength spring steel and its production method
  • A kind of heat-resistant high-strength spring steel and its production method
  • A kind of heat-resistant high-strength spring steel and its production method

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Embodiment 1

[0058] The production process of the heat-resistant high-strength spring steel in this embodiment is: electric arc furnace smelting→LF furnace refining→RH or VD vacuum degassing→round billet continuous casting→square billet rolling→flaw detection, grinding→excellent rod heating furnace heating →Controlled rolling and controlled cooling→Round steel finished product→Round steel quenching and tempering treatment.

[0059] Wherein, the heating temperature of the excellent rod heating furnace is 980-1070°C, preferably 1020-1050°C, and the time for the billet in the furnace is ≤170min, preferably 140-160min. Controlled rolling and controlled cooling adopts KOCKS controlled rolling and controlled cold rolling. When rolling round steel, the starting rolling temperature is 880-945°C, preferably 900-920°C; the finishing rolling temperature is 780-840°C, preferably 800-820°C. The hot-rolled round steel adopts the following quenching and tempering heat treatment process: quenching at 870...

Embodiment 2

[0063] The spring steel of this embodiment and its production method are basically the same as in Embodiment 1, except that the chemical composition of the spring steel of this embodiment is: C 0.63%, Si 1.55%, Mn 0.83%, Cr 0.24%, V 0.27% , Mo 0.23%, W0.89%, Co 0.50%, P 0.008%, S 0.001%, and the rest are Fe and other unavoidable impurities. In this embodiment, when heating with an excellent rod heating furnace, the heating temperature is controlled at 1030° C., and the billet stays in the furnace for 145 minutes. When rolling round steel, the starting rolling temperature is 910°C; the final rolling temperature is 810°C. The heat treatment process is: 870°C quenching (oil cooling), quenching medium temperature 20°C, 400°C tempering (air cooling). After heat treatment, the structure is tempered troostite.

Embodiment 3

[0065] The spring steel of this embodiment and its production method are basically the same as in Embodiment 1, the difference being that the chemical composition of the spring steel of this embodiment is: C 0.65%, Si 1.54%, Mn 0.80%, Cr 0.21%, V 0.33% , Mo 0.25%, W1.10%, Co 0.35%, P 0.007%, S 0.002%, and the rest are Fe and other unavoidable impurities. In this embodiment, when heating with an excellent rod heating furnace, the heating temperature is controlled at 1040° C., and the billet stays in the furnace for 150 minutes. When rolling round steel, the starting rolling temperature is 915°C; the final rolling temperature is 815°C. The heat treatment process is: 870°C quenching (oil cooling), quenching medium temperature 30°C, 400°C tempering (air cooling). After heat treatment, the structure is tempered troostite.

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Abstract

The invention discloses a heat-resistant high-strength spring steel and a production method thereof, belonging to the technical field of metal smelting. The chemical composition of a heat-resistant high-strength spring steel according to the present invention is: C 0.55%-0.65%, Si 1.30%-2.00%, Mn 0.70%-0.90%, Cr 0.10%-0.30%, V 0.20 % ~ 0.40%, Mo 0.10% ~ 0.30%, W 0.60% ~ 1.20%, P trace ~ 0.015%, S trace ~ 0.010%, O≤0.0012%, N≤0.006%, the rest is Fe and other unavoidable of impurities. The chemical composition ratio needs to meet the relational formula: (1) W / (Mo+Co)≥1.5; (2) 0.9C≤0.35W+0.70Mo+0.20Cr+V≤1.5C. The invention also provides the production method and heat treatment process of the steel. Mechanical properties at room temperature after heat treatment: tensile strength ≥ 1850MPa, elongation after fracture ≥ 10%, reduction of area ≥ 40%, fatigue strength ≥ 860MPa; mechanical properties at high temperature 400 ℃ tensile strength ≥ 900MPa, stress change rate at high temperature < 35 %, has good high-temperature performance and high-temperature anti-relaxation performance, and meets the requirements of springs in high-temperature environments.

Description

technical field [0001] The invention relates to the technical field of metal smelting, and more specifically relates to a heat-resistant high-strength spring steel and a production method thereof. Background technique [0002] Spring is a key basic part of the equipment manufacturing industry. It is widely used in various fields of the national economy such as automobiles, railways, construction machinery, and electronic appliances. As a widely used device in various industries, spring plays a vital role in the stability and safety of automobiles, aircraft and machinery, so the performance requirements of spring steel are extremely high. [0003] With the lightweight of automobiles, the large-scale of major technical equipment and the limit of parameters, higher and higher requirements are put forward for the variety and performance of spring steel. According to the use requirements of different environments, many spring steel products with special properties, such as heat-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/34C22C38/30C22C38/24C22C38/22C22C38/04C22C33/04C21D8/06C21D1/18
CPCC22C38/34C22C38/30C22C38/24C22C38/22C22C38/04C22C38/002C22C33/04C21D8/065C21D1/18
Inventor 张晓瑞汪开忠尹德福龚梦强姜婷于同仁孙凯郭湛余良其丁雷吴建曦郝震宇
Owner MAANSHAN IRON & STEEL CO LTD
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