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Non-heat-treated steel for soft nitriding, and soft-itrided component

A technology of nitrocarburized parts and non-quenched and tempered steel, which is applied in the fields of non-quenched and tempered steel for nitrocarburized parts and steel for nitrocarburized parts, to achieve excellent bending correction, high bending fatigue strength, and easy manufacturing Effect

Active Publication Date: 2013-07-24
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] On the other hand, due to safety issues or equipment constraints, there are cases where only water cooling can be performed in the cooling process after nitrocarburization

Method used

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  • Non-heat-treated steel for soft nitriding, and soft-itrided component
  • Non-heat-treated steel for soft nitriding, and soft-itrided component
  • Non-heat-treated steel for soft nitriding, and soft-itrided component

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Experimental program
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Embodiment

[0110] Steels A to N having the chemical compositions shown in Table 3 were smelted in a 70-ton converter, and rolled into billets with a cross-sectional size of 180mm×180mm.

[0111] Steels A to E in Table 3 are steels whose chemical compositions are within the range specified by the present invention. On the other hand, steels F to N are steels whose chemical compositions do not satisfy the conditions specified in the present invention.

[0112] [table 3]

[0113]

[0114] The above-mentioned steel was forged into a steel bar with a diameter of 90 mm, and further forged into a steel bar with a diameter of 50 mm under conditions of a heating temperature of 1200° C. and a finishing temperature of 1000 to 1050° C. After forging, it is naturally cooled to room temperature in the atmosphere.

[0115] Selected from the R / 2 portion of each steel bar with a diameter of 50mm obtained as described above figure 1 Ono-type rotating bending fatigue test piece with the shape shown ...

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PUM

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Abstract

The present invention provides: a soft-nitrided component which, even when having been produced through water cooling after soft nitriding, has a flex fatigue strength of 600 MPa or higher and excellent straightenability; and a non-heat-treated steel for soft nitriding, which is suitable for use as a raw material for the soft-nitrided component. The non-heat-treated steel for soft nitriding has a chemical composition that contains 0.25-0.35%, excluding 0.35%, C, 0.15-0.35% Si, 0.85-1.20% Mn, up to 0.10% S, 0.010-0.030%, excluding 0.010%, Al, 0.003-0.020% Ti, and 0.010-0.020% N, with the remainder comprising Fe and impurities, in which P =0.08% and Cr=0.10%, and that satisfies 0.02C+0.22Mn+0.87Cr+0.85Al+0.72=0.96 and 2.40C-0.54Mn-9.26Cr-0.01Al+1.59=0.90.

Description

technical field [0001] The present invention relates to non-quenched and tempered steel for nitrocarburizing and nitrocarburized components. Specifically, it relates to parts used after nitrocarburizing (hereinafter referred to as "soft nitrocarburized parts") such as crankshafts of engine parts such as automobiles and construction machinery, and parts suitable for use without "quenching-tempering" after rolling. ", "Normalizing", "Annealing" and other heat treatments and used as the raw material for nitrocarburizing (hereinafter referred to as "non-quenched and tempered steel for nitrocarburizing"). More specifically, it relates to nitrocarburized parts having a high bending fatigue strength of 600 MPa or more and excellent bend correction properties, and materials suitable for use as raw materials for nitrocarburized parts requiring bend correction under various nitrocarburized conditions, especially It is a non-quenched and tempered steel for nitrocarburizing that can make...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60C21D1/06C21D8/06C21D9/30
CPCC22C38/14C21D9/30C22C38/06C22C38/02C22C38/28C22C38/04C21D9/28C23C8/26C23C8/24C22C38/001
Inventor 西谷成史高须贺干松本齐祐谷将人谷山明佐野直幸江头诚高桥宏昌斋藤勇
Owner NIPPON STEEL CORP
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