Heat-resistant spring steel with tensile strength larger than 2100 MPa and production method thereof

A 2100mpa, tensile strength technology, applied in the field of spring steel, can solve the problems of poor tensile strength, strong toughness, impact resistance and fatigue strength, poor performance, and difficulty in use, to improve high temperature performance and good heat resistance. , to ensure the effect of stability

Active Publication Date: 2020-10-09
MAANSHAN IRON & STEEL CO LTD
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  • 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 larger than 2100 MPa and production method thereof
  • Heat-resistant spring steel with tensile strength larger than 2100 MPa and production method thereof
  • Heat-resistant spring steel with tensile strength larger than 2100 MPa and production method thereof

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Embodiment 1

[0063] The spring steel of this embodiment has chemical composition: 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%, the rest is Fe and other unavoidable impurities. The hot rolled structure of the wire rod is pearlite + ferrite, and its austenite grain size is 11 grades.

[0064] The processing steps adopt the process flow of the present invention, wherein the double quenching heat treatment conditions are:

[0065] Quench at 850℃ for 20min (oil cooling), temper at 480℃ for 120min (air cooling)→quench at 800℃ for 20min (oil cooling), temper at 400℃ for 120min (air cooling).

[0066] Then the room temperature mechanical properties and high temperature mechanical properties after double quenching heat treatment are tested, and the results are shown respectively image 3 and Figure 4 . Finally, its thermal conductivity at different temperatures was tested, and the results are shown in Figure 5 .

Embodiment 2

[0068] The chemical composition of the spring steel of 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%, the rest is Fe and other unavoidable impurities. The hot rolled structure of the wire rod is pearlite + ferrite, and its austenite grain size is 11.5.

[0069] The processing steps adopt the process flow of the present invention, wherein the double quenching heat treatment conditions are:

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

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

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

Embodiment 3

[0074] The spring steel of this embodiment has chemical composition: 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 structure of the wire rod is pearlite + ferrite, and its austenite grain size is 11.5.

[0075] The processing steps adopt the process flow of the present invention, wherein the double quenching heat treatment conditions are:

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

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

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

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Abstract

The invention discloses a heat-resistant spring steel with the tensile strength larger than 2100 MPa and a production method thereof and belongs to the technical field of spring steel. The heat-resistant spring steel is prepared from, by weight percent, 0.55%-0.65% of C, 1.30%-2.00% of Si, 0.70%-0.90% of Mn, 1.10%-1.50% of Cr, 0.15%-0.35% of V, 0.02%-0.04% of Nb, 0.10%-0.30% of Mo, 0.60%-1.20% ofW, the trace amount to 0.015% of P, the trace amount to 0.010% of S, not larger than 0.0010% of O, not larger than 0.007% of N and the balance Fe and inevitable impurities. The machining process comprises the steps of electric-arc furnace smelting, LF furnace refining, RH or VD vacuum degassing, round billet continuous casting, square billet rolling, finishing and peeling, high-speed wire controlrolling, Stelmor cooling line controlled cooling, wire rod finishing and double quenching heat treatment. According to the normal-temperature mechanical properties of the obtained spring steel, the tensile strength is larger than or equal to 2100 MPa, the percentage elongation after fracture is larger than or equal to 10%, the reduction percentage of the cross section is larger than or equal to 40%, and the fatigue strength is larger than or equal to 960 MPa; and according to the high-temperature mechanical properties, the tensile strength at the temperature of 400 DEG C is larger than or equal to 900 MPa, and the heat conductivity coefficient at the temperature of 20 DEG C to 700 DEG C ranges from 30 W/(m.K) to 35 W/(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> 2100 MPa and a production method thereof. Background technique [0002] Spring steel has excellent comprehensive mechanical properties and elastic resistance, and is widely used in key areas 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 placed on the performance of spring steel. Not only is the spring steel required to have high strength, good toughness, and good fatigue properties, but also, depending on its use environment, it also needs to meet many other special properties, such as corrosion resistance and tensile resistance. [0003] With the rapid development of the domestic aviation industry, the demand for heat-resistant spring steel is increasing, and the require...

Claims

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Application Information

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Patent Type & Authority Applications(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
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