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High-strength spring steel wire excellent in spring workability, manufacturing method thereof, and high-strength spring

A technology with excellent workability and manufacturing method, applied in the field of high-strength springs, can solve the problems of grain size deviation, reduced spring quality, reduced workability, etc., and achieves the effect of good SV.

Inactive Publication Date: 2016-12-14
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, although the hardness of the structure is reduced, the grains are coarsened during slow cooling, and the deviation of the grain size is also large, so the workability is reduced, and it is not suitable for processing as high-strength spring steel.
In addition, decarburization during slow cooling is also serious, which reduces the quality of the spring as a product

Method used

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  • High-strength spring steel wire excellent in spring workability, manufacturing method thereof, and high-strength spring
  • High-strength spring steel wire excellent in spring workability, manufacturing method thereof, and high-strength spring
  • High-strength spring steel wire excellent in spring workability, manufacturing method thereof, and high-strength spring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] After smelting the steel ingots with the chemical compositions shown in the following Tables 1 and 2 in a converter, the steel ingots were subjected to billet rolling to produce billets with a cross-section of 155 mm × 155 mm, heated to 1000° C., and processed (hot rolled) into Wire diameter: circle line. Next, coils (Test Nos. 1 to 31) with a single weight of 2 ton were produced under the production conditions shown in Tables 3 and 4 below, and the structure, mechanical properties, and spring workability (drawability, windability, and SV properties) were examined. ). The adjustment of the cooling rate in Tables 3 and 4 was performed by adjusting the conveyor speed.

[0075] 【Table 1】

[0076]

[0077] 【Table 2】

[0078]

[0079] 【table 3】

[0080]

[0081] 【Table 4】

[0082]

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PUM

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Abstract

The high-strength spring steel wire rod of the present invention is a steel wire rod after hot rolling, has a predetermined chemical composition, has a pearlite area ratio of 90% or more, and the average value Pave of the particle size number of the pearlite cluster and its standard The deviation Pσ satisfies the following formulas (1) and (2), respectively: 8.0≤Pave≤12.0...(1); 0.0<Pσ≤0.5...(2).

Description

technical field [0001] The present invention relates to a high-strength spring steel wire rod having high workability (drawability, coilability, and SV properties described later) for valve springs and the like used in automobiles, a method for producing the same, and a high-strength spring steel wire rod obtained from the high-strength spring steel wire rod. High-strength springs (hard pull springs, oil tempered springs), etc. Background technique [0002] Among the springs used in automobiles, valve springs mainly used in engines are known. The valve springs are mainly oil tempered (hereinafter referred to as "OT treatment") of wire rods that have undergone wire drawing, and then applied to improve the performance. Quenching-tempering of spring properties is processed (coiled) into a spring shape and manufactured. In the manufacturing process of such a spring, the main factors which reduce the production efficiency include wire breakage during wire drawing and wire breaka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/52C22C38/18C22C38/54
CPCC21D1/84C21D6/008C21D9/02C21D9/525C21D2211/004C21D2211/009C22C38/04C22C38/20C22C38/22C22C38/24C22C38/26C22C38/34
Inventor 大浦宏之吉原直
Owner KOBE STEEL LTD