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High-strength high-ductility spring steel used in high-temperature and high-pressure conditions and production method of high-strength high-ductility spring steel used in high-temperature and high-pressure conditions

A high-temperature, high-pressure, production method technology, applied in the field of metal smelting, can solve the problems that the heat resistance performance needs to be further improved, achieve high yield ratio, improve tensile strength and fatigue strength, and reduce the effect of high temperature tempering brittleness tendency

Active Publication Date: 2020-11-10
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application is designed through niobium vanadium microalloying composition, smelting, refining, vacuum degassing, continuous casting, wire rolling, after heat treatment, the tensile strength of spring steel is ≥2000MPa, excellent fatigue resistance, and has good corrosion resistance performance, but its heat resistance needs to be further improved

Method used

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  • High-strength high-ductility spring steel used in high-temperature and high-pressure conditions and production method of high-strength high-ductility spring steel used in high-temperature and high-pressure conditions
  • High-strength high-ductility spring steel used in high-temperature and high-pressure conditions and production method of high-strength high-ductility spring steel used in high-temperature and high-pressure conditions
  • High-strength high-ductility spring steel used in high-temperature and high-pressure conditions and production method of high-strength high-ductility spring steel used in high-temperature and high-pressure conditions

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Experimental program
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Effect test

Embodiment 1

[0063] The specific production process of 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→finishing peeling→high-speed wire rod rolling→Stelmore Cooling line slow cooling → Φ6.5 ~ 25mm wire rod finished product → wire rod quenching and tempering treatment.

[0064] Wherein, during the high-speed wire rod rolling, the heating temperature of the high-speed wire rod heating furnace is 980-1050°C, preferably 1000-1030°C. The time for the billet in the furnace is ≤120min, preferably 100min. During wire rod rolling, the starting rolling temperature is 880-980°C, preferably 900-920°C; the final rolling temperature is 750-830°C, preferably 780-810°C; the spinning temperature is 830-860°C, preferably 840-850°C.

[0065] The wire rod rolling adopts high speed, no torsion and small tension rolling. During rolling, the billet heating temperature is controlled at ≤1050°C, ...

Embodiment 2

[0069] 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 0.35%, Si 1.56%, Mn 0.85%, Cr 0.23%, V 0.18% , Nb 0.028%, Mo0.21%, W 0.84%, P 0.007%, S 0.003%, and the rest are iron and other impurities. In this embodiment, during high-speed wire rolling, the heating temperature of the high-speed wire heating furnace is preferably 1010°C. The billet is preferably in the furnace for 110 minutes. When rolling the wire rod, the starting rolling temperature is preferably 910°C; the finishing rolling temperature is preferably 790°C; and the spinning temperature is preferably 842°C. The heat treatment process is: 830°C quenching (oil cooling), quenching medium temperature 20°C, 400°C×120min tempering (air cooling). After heat treatment, the structure is tempered troostite. The hot-rolled structure is pearlite + ferrite, and its austenite grain size is ...

Embodiment 3

[0071] 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 0.42%, Si 1.55%, Mn 0.83%, Cr 0.24%, V 0.25% , Nb 0.030%, Mo0.23%, W 0.88%, P 0.009%, S 0.002%, and the rest are iron and other impurities. In this embodiment, during high-speed wire rolling, the heating temperature of the high-speed wire heating furnace is preferably 1020°C. The billet is preferably in the furnace for 110 minutes. When rolling the wire rod, the starting rolling temperature is preferably 915°C; the finishing rolling temperature is preferably 800°C; and the spinning temperature is preferably 845°C. The heat treatment process is: 830°C quenching (oil cooling), quenching medium temperature 30°C, 400°C×120min tempering (air cooling). After heat treatment, the structure is tempered troostite. The hot-rolled structure is pearlite + ferrite, and its austenite ...

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Abstract

The invention discloses high-strength high-ductility spring steel used in high-temperature and high-pressure conditions and a production method of the high-strength high-ductility spring steel used inthe high-temperature and high-pressure conditions, and belongs to the technical field of metal smelting. The spring steel comprises the following components in percentage by weight: 0.30%-0.50% of C,1.30%-1.80% of Si, 0.80%-1.00% of Mn, 0.10%-0.30% of Cr, 0.10%-0.30% of V, 0.020%-0.040% of Nb, 0.10%-0.30% of Mo, 0.60%-1.20% of W, 0.015% of trace P, 0.010% of trace S and the balance Fe and impurities. The chemical component proportions meet the following condition: Meq=[C]-(0.10[Cr]+0.20[V]+0.03[Nb]+0.05[W]+0.08[Mo]). The steel has good heat-resistant performance, so that the use requirementsof springs under the high-temperature conditions are met.

Description

technical field [0001] The invention relates to the technical field of metal smelting, and more specifically relates to a high-strength and high-toughness spring steel for high-temperature and high-pressure conditions and a production method thereof. Background technique [0002] 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. High strength, high elongation, high area reduction and high fatigue resistance are the development trends of spring steel in the future. [0003] Not only that, the demand for heat-resistant spring steel that can withstand high temperature and high pressure under special use conditions is also increasing, and the requirements are getting higher and higher. Therefore, the research and development of heat-resistant, high-strength and high-toughness spring steel is conducive to improving the ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34C22C38/26C22C38/24C22C38/22C22C38/04C22C33/04C21D8/06C21D1/18
CPCC22C38/34C22C38/26C22C38/24C22C38/22C22C38/04C22C38/002C22C33/04C21D8/065C21D1/18C21D2211/005C21D2211/003C21D2211/004
Inventor 张晓瑞汪开忠于同仁尹德福姜婷龚梦强郭湛丁雷余良其孙凯丁新军许文喜牟祖茂
Owner MAANSHAN IRON & STEEL CO LTD
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