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Steel wire for springs, and spring

A steel wire quality technology, applied in the field of spring steel wire and high-strength spring steel wire, can solve the problems of low elastic weakening resistance, spring recovery force reduction, insufficient elastic weakening resistance technology, etc., to achieve durability Excellent elastic weakening property and good processability

Active Publication Date: 2018-07-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the weakening resistance is low, there will be a problem that the weakening amount of the spring becomes large under a high stress load, and the restoring force as a spring decreases.
However, with such a technique, the effect of improving fatigue properties and weakening resistance is small.
[0009] As described above, conventionally proposed technologies for improving the weakening resistance are insufficient, and high-strength steel wires for springs capable of improving the weakening resistance of springs that can meet the recent demand for higher strength of springs have not yet been obtained.

Method used

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  • Steel wire for springs, and spring
  • Steel wire for springs, and spring
  • Steel wire for springs, and spring

Examples

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Embodiment

[0093] Converter cast steels having the compositions shown in steel grades A to Z in Table 1 and steel grades AA to AV in Table 2 were continuously cast, and if necessary, passed through a soaking diffusion treatment process and a billet rolling process to produce 162 mm Square rolled raw material. Thereafter, it was heated to 1150° C. and hot rolled to form a φ8.0 mm steel wire rod. The surface of the steel wire rod was peeled to φ7.4 mm, heated to 950° C., and then lead quenching was performed at the temperatures shown in Tables 3 and 4. After cold drawing to φ4.0mm, quenching and tempering were performed, and the heating temperature before quenching was changed within the range shown in Tables 3 to 4, thereby manufacturing the size of the iron-based carbides in each steel wire and density of existence. In addition, by using a water-soluble quenching liquid (liquid temperature: 40° C.), adjusting the degree of stirring (0 to 50 cm / sec), and changing the cooling rate, each ...

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Abstract

A steel wire for springs contains C: 0.40-0.75% by mass, Si: 1.00-5.00% by mass, Mn: 0.20-2.00% by mass, P: 0.0001-0.0500% by mass, S: 0.0001-0.0500% by mass, Cr: 0.50-3.50% by mass, Al: 0.0005-0.0500% by mass, N: 0.0020-0.0100%% by mass, Mo: 0-2.00% by mass, V: 0-0.50% by mass, W: 0-0.50% by mass, Nb: 0-0.100% by mass, Ti: 0-0.100% by mass, Ca: 0-0.0100% by mass, Mg: 0-0.0100% by mass, Zr: 0-0.1000% by mass, B: 0-0.0100% by mass, Cu: 0-1.00% by mass, and Ni: 0-3.00% by mass, the remainder being Fe and inevitable impurities. The structure includes tempered martensite having an area ratio of 90% or greater. The old austenite grain size number is 12.5 or higher. The concentration of iron carbide having an equivalent circle diameter of 0.15-0.50 um is 0.40 units / um2 to 2.00 units / um2 inclusive.

Description

technical field [0001] The present invention relates to steel wires for springs mainly used in high-strength springs such as valve springs, clutch damper springs, and suspension springs used in automobiles, and in particular to steel wires for high-strength springs that are excellent in spring weakening resistance after spring processing, and A spring made from this steel wire. [0002] this application claims priority based on Japanese Patent Application No. 2015-174730 for which it applied to Japan on September 04, 2015, and uses the content here. Background technique [0003] As automobiles become lighter and more functional, springs used in the above-mentioned various applications are also directed to increase the design stress. In this case, the load stress of the spring increases, and thus a spring excellent in fatigue strength and weakening resistance is required. The so-called elastic weakening refers to the occurrence of plastic deformation in the stress load. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60F16F1/02C21D9/52
CPCC21D1/25C21D1/48C21D6/002C21D6/008C21D8/065C21D9/02C21D9/525C21D2211/004C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34F16F1/02C21D9/52C22C38/60
Inventor 寺本真也枪田博铃木章一
Owner NIPPON STEEL CORP
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