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Heat-treatment steel for high-strength spring

A heat-treated steel and high-strength technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve the problems of the limit of direct strengthening of spring performance

Inactive Publication Date: 2014-02-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, these regulations are strong in suppressing "defects" and the deterioration of workability, and there is still a limit to the direct enhancement of spring performance.

Method used

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  • Heat-treatment steel for high-strength spring
  • Heat-treatment steel for high-strength spring
  • Heat-treatment steel for high-strength spring

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Experimental program
Comparison scheme
Effect test

Embodiment

[0135] The present invention is illustrated in detail based on the following examples.

[0136] In order to clarify the effect of the present invention, a characteristic test of a material prepared in a 16 kg vacuum melting furnace was carried out.

[0137] Table 1

[0138]

C

Si

mn

P

S

N

V

Cr

Nb

Mo

W

Example

0.61

2.37

0.57

0.004

0.009

0.0031

0.20

1.24

0.005

0.11

0.22

[0139] Steels with chemical compositions shown in Table 1 were melted in a 16 kg vacuum melting furnace, forged, then normalized, lead bath quenched, and quenched and tempered. The normalizing temperature is: (A) 1250°C × 1 hour → slow cooling, (B) 1150°C × 1 hour → slow cooling, a total of 2 levels, and then heated at 950°C respectively for lead bath quenching. Quenching and tempering is carried out at 910°C and tempering temperature of 500°C. Further, the materials (A) and (B) were respectively a...

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Abstract

The present invention provides spring-use heat treated steel which is cold coiled, can achieve both sufficient atmospheric strength and coiling workability, has a tensile strength of 2000 MPa or more, and can improve the performance as a spring by heat treatment after shaping the spring, that is, heat treated steel for high strength spring containing, by mass%, C: 0.45 to 0.9%, Si: 1.0 to 3.0%, Mn: 0.1 to 2.0%, V: over 0.1 to 1.0%, N: limited to 0.007% or less, and a balance of Fe and unavoidable impurities, and satisfying, in terms of the analyzed value of the extracted residue after heat treatment, [amount of V in filtrate filtered by 0.2 µm filter (mass%)]‰¥[amount of V in steel (mass%)]‰¥0.4.

Description

[0001] This application is a divisional application of an invention patent application with the application number 200780000426.5, the invention name is "Heat-treated steel for high-strength springs", the application date is March 29, 2007, and the date of entering the Chinese national phase is October 26, 2007 . technical field [0002] The present invention relates to a high-strength heat-treated spring steel that can be coiled in a hot state or a cold state, has high strength and high toughness, and is especially coiled in a cold state and subjected to nitriding treatment. Background technique [0003] With the reduction in weight and performance of automobiles, the strength of springs has also increased, and high-strength steels with a tensile strength exceeding 1,500 MPa after heat treatment are used as springs. In recent years, steel wires having a tensile strength exceeding 2100 MPa have also been demanded. This is to ensure a material hardness that does not cause pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34C22C38/12C21D1/18
CPCC22C38/54C22C38/50C22C38/46C22C38/42C21D2211/008C22C38/48C21D9/525C21D1/25C22C38/52C22C38/60C22C38/44Y02P10/20C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 桥村雅之越智达朗金须贵之萩原博
Owner NIPPON STEEL CORP
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