Steel wire rod with excellent shavability for high-strength spring, and high-strength spring
A high-strength, steel wire technology, which is applied in the fields of high-strength spring steel wire, high-strength spring steel wire and high-strength spring, can solve the problem of SV handleability reducing tissue ductility, failure to improve SV handleability, and alloy addition change To achieve the effect of good peeling performance and good peeling and shavings discharge performance
Inactive Publication Date: 2014-11-26
KOBE STEEL LTD
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Problems solved by technology
However, the current situation is that the main reason for the reduction of SV treatability is the influence of alloy-based carbides, nitrides, etc. that affect the ductility and toughness of the structure.
[0007] On the other hand, in Patent Document 3, the SV treatability is improved by specifying the mechanical properties, but in this technology, the amount of alloy addition increases, and in spring steel with many precipitations of alloy-based carbides and nitrides, the current situation is Only satisfying mechanical properties does not improve SV handling
Method used
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[0066] Hereinafter, the present invention will be explained in more detail with examples. However, the present invention is of course not limited by the following examples. Of course, the present invention may be appropriately modified and implemented within a range that can conform to the gist described above and below. These are all included in the present invention. Within the technical scope of the invention.
[0067] After smelting the steel ingots with the chemical composition shown in the following Tables 1 and 2 in the converter, the steel ingots were billeted and rolled to produce a slab with a cross-section of 155mm×155mm, heated to 1000°C, and then hot rolled to the following table The conveyor mounting temperature shown in 3 and 4 (the mounting temperature after rolling) is performed at an average cooling rate (from the mounting temperature to 600°C, and from less than 600°C to 400°C) After cooling, a coil with a wire diameter of 8.0 mmφ and a unit weight of 2 ton was...
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This steel wire rod for a high-strength spring is a hot-rolled steel wire rod which has a prescribed chemical composition and a texture such that: the area fraction of pearlite is 90% or more; and the average grain size number of pearlite nodules, namely Pave, satisfies the relationship (1) 6.0 <= Pave <= 12.0. In the hot-rolled steel wire rod, the overall depth of the decarburized surface layer is 0.20mm or less, and the content of Cr-based alloy carbides is 7.5% or lower relative to the mass of the steel wire rod. The wire rod for a high strength spring and a high-strength spring obtained using the same as the raw material exhibit excellent shavability and ensure excellent discharge of shavings and excellent SV processing which is not accompanied with the breaking of wire.
Description
Technical field [0001] The present invention relates to high-strength spring steel wires and high-strength springs useful as raw materials for high-strength springs (especially valve springs) used in automobile clutches, engines, fuel injection devices, suspension mechanisms, etc., and particularly relates to peeling A high-strength spring steel wire material capable of exhibiting good peelability in the process and a high-strength spring obtained from the high-strength spring steel wire material. Background technique [0002] Springs used in such environments are required to have a high level of fatigue resistance due to long-term use under high stress. In order to improve fatigue resistance properties, excellent surface properties and excellent inclusion control are required. Among them, for the surface texture, although the spring is flattened and hardened by shot peening and nitriding treatment after the spring is formed, if there are defects of only tens of microns or so, i...
Claims
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IPC IPC(8): C22C38/34C22C38/54F16F1/02C21D8/06
CPCC22C38/34C22C38/32C22C38/22C22C38/20C22C38/54C21D8/06C22C38/06C22C38/04C22C38/24C22C38/26C22C38/40C21D8/065C21D9/02C21D2211/004C21D2211/009C22C38/44C22C38/46
Inventor 大浦宏之吉原直
Owner KOBE STEEL LTD