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Heat-resistant spring steel with tensile strength>2100mpa and production method thereof

A 2100mpa, tensile strength technology, applied in the field of spring steel, can solve the problems of difficult to meet the use, poor performance, tensile strength, toughness, impact resistance and poor fatigue strength, so as to improve high temperature performance and good heat resistance , the effect of high tensile strength

Active Publication Date: 2021-12-14
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the performance of existing spring steel, such as relatively poor tensile strength, toughness, impact resistance and fatigue strength, especially its above-mentioned performance at high temperature is relatively poor, thus it is difficult to meet its requirements. Insufficient for use under high temperature conditions, a heat-resistant spring steel with a tensile strength > 2100MPa and its production method are provided

Method used

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  • Heat-resistant spring steel with tensile strength>2100mpa and production method thereof
  • Heat-resistant spring steel with tensile strength>2100mpa and production method thereof
  • Heat-resistant spring steel with tensile strength>2100mpa and production method thereof

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Embodiment 1

[0063] The chemical composition of the spring steel in this embodiment is: C: 0.55%, Si: 1.80%, Mn: 0.80%, Cr: 1.10%, V: 0.15%, Nb: 0.040%, Mo: 0.10%, W: 0.60 %, P: 0.015%, S: 0.010%, O: 0.0010%, N: 0.005%, and the rest are Fe and other unavoidable impurities. The microstructure of the hot-rolled wire rod is pearlite + ferrite, and its austenite grain size is 11 grades.

[0064] Its processing step adopts technological process of the present invention, and wherein double quenching heat treatment condition is:

[0065] Quenching at 850°C for 20min (oil cooling), tempering at 480°C for 120min (air cooling) → quenching at 800°C for 20min (oil cooling), tempering at 400°C for 120min (air cooling).

[0066] Then its normal temperature mechanical properties and high temperature mechanical properties after double quenching heat treatment are tested, the results are shown in image 3 and Figure 4 . Finally, its thermal conductivity at different temperatures was tested, and the re...

Embodiment 2

[0068] The chemical composition of the spring steel in this embodiment is: C: 0.65%, Si: 1.30%, Mn: 0.70%, Cr: 1.20%, V: 0.35%, Nb: 0.02%, Mo: 0.12%, W: 0.65%, P: 0.012%, S: 0.020%, O: 0.0009%, N: 0.002%, and the rest are Fe and other unavoidable impurities. The hot-rolled wire rod structure is pearlite + ferrite, and its austenite grain size is 11.5.

[0069] Its processing step adopts technological process of the present invention, and wherein double quenching heat treatment condition is:

[0070] Quenching at 860°C for 30min (oil cooling), tempering at 500°C for 120min (air cooling) → quenching at 830°C for 30min (oil cooling), tempering at 430°C for 120min (air cooling).

[0071] Then its normal temperature mechanical properties and high temperature mechanical properties after double quenching heat treatment are tested, the results are shown in image 3 and Figure 4 .

[0072] Finally, its thermal conductivity at different temperatures was tested, and the results are ...

Embodiment 3

[0074] The chemical composition of the spring steel in this embodiment is: C: 0.65%, Si: 2.00%, Mn: 0.90%, Cr: 1.10%, V: 0.16%, Nb: 0.02%, Mo: 0.10%, W: 1.20 %, P: 0.018%, S: 0.010%, O: 0.0006%, N: 0.007%, and the rest are Fe and other unavoidable impurities. The hot-rolled wire rod structure is pearlite + ferrite, and its austenite grain size is 11.5.

[0075] Its processing step adopts technological process of the present invention, and wherein double quenching heat treatment condition is:

[0076] Quenching at 870°C for 30min (oil cooling), tempering at 450°C for 100min (air cooling) → quenching at 820°C for 30min (oil cooling), tempering at 450°C for 100min (air cooling).

[0077] Then its normal temperature mechanical properties and high temperature mechanical properties after double quenching heat treatment are tested, the results are shown in image 3 and Figure 4 .

[0078] Finally, its thermal conductivity at different temperatures was tested, and the results are...

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Abstract

The invention discloses a heat-resistant spring steel with a tensile strength greater than 2100MPa and a production method thereof, belonging to the technical field of spring steel. The weight percent range of its components is as follows: C: 0.55% to 0.65%, Si: 1.30% to 2.00%, Mn: 0.70% to 0.90%, Cr: 1.10% to 1.50%, V: 0.15% to 0.35%, Nb : 0.02% ~ 0.04%, Mo: 0.10% ~ 0.30%, W: 0.60% ~ 1.20%, P: trace ~ 0.015%, S: trace ~ 0.010%, O≤0.0010%, N≤0.007%, the rest For Fe and other unavoidable impurities. Its processing flow is: electric arc furnace smelting, LF furnace refining, RH or VD vacuum degassing, round billet continuous casting, billet rolling, finishing peeling, high-speed wire rod controlled rolling, Stelmore cooling wire controlled cooling, wire rod Wire rod finished and double quenching heat treatment. The mechanical properties of the obtained spring steel at room temperature are: tensile strength ≥ 2100MPa, elongation after fracture ≥ 10%, reduction of area ≥ 40%, fatigue strength ≥ 960MPa; its high-temperature mechanical properties are: tensile strength at 400°C ≥ 900MPa; At a temperature of 20°C to 700°C, the thermal conductivity ranges from 30W / (m·K) to 35W / (m·K).

Description

technical field [0001] The invention belongs to the technical field of spring steel, and more specifically relates to a heat-resistant spring steel with a tensile strength >2100MPa and a production method thereof. Background technique [0002] Spring steel has excellent comprehensive mechanical properties and elastic resistance, and is widely used in key fields of the national economy such as automobiles, aviation and military. In recent years, with the continuous development of industrial technology, higher and higher requirements have been put forward for the performance of spring steel. Not only are spring steels required to have high strength, good toughness, and good fatigue properties, but they also need to meet many other special properties, such as corrosion resistance and tensile resistance, depending on their use in different environments. [0003] With the rapid development of the domestic aviation industry, the demand for heat-resistant spring steel is increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/34C21D6/00C21D8/06C22C33/04
CPCC22C38/02C22C38/04C22C38/34C22C38/24C22C38/26C22C38/22C22C33/04C21D6/002C21D6/005C21D6/008C21D8/065
Inventor 张晓瑞汪开忠尹德福龚梦强于同仁姜婷丁雷孙凯郭湛余良其吴建曦牟祖茂
Owner MAANSHAN IRON & STEEL CO LTD