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High strength stainless steel wire excellent in ductility-toughness and modulus of rigidity and method for production thereof

A technology of rigidity modulus and manufacturing method, applied in the direction of manufacturing tools, welding media, furnace types, etc., can solve the problems of ductility and toughness that have not been studied, popularized, and restricted.

Inactive Publication Date: 2004-09-01
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP +1
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Problems solved by technology

However, this method must be quenched immediately after processing the austenite structure in the hot temperature or warm temperature region, so it is relatively limited and has hardly been popularized in industry.
[0004] In the prior art, no research has been conducted on strategies for improving ductility (ductility and toughness) and modulus of rigidity of stainless steel wires used for springs, etc.

Method used

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  • High strength stainless steel wire excellent in ductility-toughness and modulus of rigidity and method for production thereof

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Embodiment

[0083] The present invention will be further specifically described below based on the examples of the present invention.

[0084] The present invention, especially as the target property of the steel wire after cold drawing, has a tensile strength of 1700 N / mm2 or 1700N / mm 2 As mentioned above, the number of torsions, which is an important factor in the ductility and toughness of the spring steel wire, is 10 times or more, and the stiffness modulus, which is an important factor in the elastic modulus of the spring steel wire, is 63 GPa or more. An important factor of the elastic modulus is Young's modulus, but in the present invention, the modulus of rigidity is specified as a representative value.

[0085] The materials for testing of the examples were obtained by smelting, hot wire rod rolling to Φ5.5 mm, and finish rolling at 1000° C. in a normal stainless steel wire rod manufacturing process. The obtained wire rod was subjected to heat treatment (solution treatment) at 1...

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Abstract

A high strength stainless steel wire excellent in ductility-toughness and modulus of rigidity, which has a chemical composition, in mass %, C: 0.03 to 0.14 %, Si: 0.1 to 4.0 %, Mn: 0.1 to 5.0 %, Ni: 5.0 to 9.0 %, Cr: 14.0 to 19.0 %, N: 0.005 to 0.20 %, O: 0.001 to 0.01 %, S: 0.0001 to 0.012 % and balance: Fe and inevitable impurities, provided that the value of (2C + N) is 0.17 to 0.32 %, that the value of Ni equivalent of the following formula (1): Ni equivalent (%) = Ni + 0.65Cr + 0.98Mo + 1.06Mn + 0.35Si + 12.6(C + N) (1) is 20 to 24, and that H <= 4 ppm. The production of the high strength stainless steel wire is achieved through the control of the amounts of basic components, oxygen, hydrogen and sulfur as mentioned above, the formation of finer crystal grains, and the toughness improving effect of ausforming by cold wire drawing.

Description

technical field [0001] The present invention relates to high-strength stainless steel wire, and more particularly, to a technology for improving ductility (ductility, toughness) and rigidity modulus by cold drawing of high-strength austenitic stainless steel wire. Background technique [0002] Historically, high-strength stainless steel wires for springs have a problem of longitudinal cracks (aging cracks) during cold drawing. Therefore, it is proposed to specify the composition, hydrogen content and the amount of martensite caused by strain after drawing to prevent this problem. technology (JP 10-121208). [0003] In addition, regarding the strengthening and toughening technology (technique of improving ductility and toughness) of iron and steel materials, in carbon steel, it has been studied for a long time to convert austenite structure into martensite by cooling in a hot or warm state after working. Method of heat treatment for austenitic deformation. (For example, Jou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26
CPCB23K35/262C21D2211/008C22C38/02C22C38/42C21D8/065C21D9/525B23K2201/36C21D7/10C22C38/58C21D2211/001C22C38/44C22C38/001C21D6/004B23K2101/36
Inventor 高野光司竹内和久多田好宣谷本好则秋月孝之
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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