High-strength spring steel wire rod and high-strength spring with excellent peelability
A high-strength, steel wire technology, applied in the field of high-strength spring steel wire and high-strength spring, high-strength spring steel wire, can solve the problem of SV treatment, reduce tissue ductility, increase alloy addition, and cannot improve SV treatment To solve the problem of peeling and other problems, achieve the effect of good peeling and peeling performance
Inactive Publication Date: 2016-03-30
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 described in more detail by citing the examples, but the present invention is certainly not limited by the following examples, and can be appropriately modified and implemented within the scope of being able to meet the gist of the foregoing and the following, and these are all included in this document. within the technical scope of the invention.
[0067] After smelting a steel ingot with the chemical composition shown in the following Tables 1 and 2 with a converter, the steel ingot was subjected to slab rolling to produce a steel billet with a cross-section of 155mm×155mm, which was heated to 1000°C and then hot-rolled, as shown in the following table The conveyor loading temperature (loading temperature after rolling) shown in 3 and 4 is carried out at the average cooling rate (from the loading temperature to 600°C, and the average cooling rate from less than 600°C to 400°C) Cool to produce a wire diameter: 8.0mmφ, a coil ...
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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 total decarburized depth of the surface layer is 0.20 mm 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. A high-strength spring steel wire capable of exhibiting good peelability in a process, and a high-strength spring obtained from the high-strength spring steel wire. Background technique [0002] Springs used in such an environment as described above are required to have a high level of fatigue resistance because they are used under high stress for a long period of time. In order to improve fatigue resistance, excellent surface texture and excellent inclusion control are required. Among them, in terms of surface properties, although after the spring is formed, it will be flattened and hardened by shot peening and nitriding treatment. Breakage occurs from surface blemishes. [0003] Therefore, a p...
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IPC IPC(8): C22C38/34C22C38/54F16F1/02C21D8/06
CPCC22C38/34C21D8/06C21D8/065C21D9/02C21D2211/004C21D2211/009C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/32C22C38/40C22C38/44C22C38/46C22C38/54
Inventor 大浦宏之吉原直
Owner KOBE STEEL LTD