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Austenitic stainless steel sheet

A soft nitriding part, non-quenching and tempering technology, applied in the direction of centrifugal force-resistant rotating parts, furnace types, bearings, etc., can solve problems such as surface cracks, and achieve high bending fatigue strength and excellent bending correction effect.

Active Publication Date: 2017-08-18
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, when the HV hardness at the position 0.05 mm from the surface of the crankshaft is set to 410 or more, cracks will occur on the surface layer during bending correction.

Method used

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  • Austenitic stainless steel sheet
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Examples

Experimental program
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Effect test

Embodiment

[0132] Steels A to N having the chemical compositions shown in Table 1 were smelted in a 70-ton converter, continuously cast, and then initially rolled into billets with cross-sectional dimensions of 180 mm×180 mm.

[0133] Next, each billet was hot-forged at a heating temperature of 1200° C. and a final temperature of 1000 to 1050° C., and processed into a steel bar with a diameter of 90 mm. The steel bar after hot forging is left to cool in the atmosphere and cooled to room temperature.

[0134] Steels A to H in Table 1 are steels whose chemical compositions are within the range specified in the present invention, and steels I to N are steels whose chemical compositions are outside the range specified in the present invention.

[0135] [Table 1]

[0136] Table 1

[0137]

[0138] The steel bar with a diameter of 90 mm thus obtained was heated to 1200° C., and hot forged at a final temperature of 1,000 to 1,050° C. to produce a steel bar with a diameter of 50 mm. The st...

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Abstract

A non-tempered soft-nitrided component that comprises a base steel material having a chemical composition which comprises, in terms of mass%, 0.35-0.50% C, 0.10-0.35% Si, 2.3-2.8% Mn, up to 0.10% S, 0.0030-0.0250% N, 0-1.0% Cu, 0-0.3% Mo, 0-0.5% Ni, 0-0.020% Ti, and Fe and impurities as the remainder and which satisfies 3.10 <= (0.316C+0.122)*(0.7Si+1)*(5.1Mn-1.12)*(0.364Ni+1)*(2.16Cr+1)*(3Mo+1) <= 6.00, the impurities including P, Al, and Cr in amounts of up to 0.08%, up to 0.05%, and less than 0.20%, respectively. In the non-tempered soft-nitrided component, a stress concentration part has a hardness HV, as measured at a depth of 0.05 mm from the surface, of 410-480 and a hardness HV, as measured at a depth of 1.0 mm from the surface, of 200 or greater and has a compound layer depth of 5 [mu]m or less. The metallographic structure of the base steel material is a bainite structure. The non-tempered soft-nitrided component has excellent straightenability and high fatigue strength.

Description

technical field [0001] The invention relates to non-tempered nitrocarburized parts. More specifically, it relates to a non-tempered nitrocarburized part having high bending fatigue strength and excellent bending straightening properties. [0002] "Non-tempered nitrocarburized part" refers to a part that is subjected to nitrocarburized treatment without undergoing the so-called "tempering treatment", that is, "quenching-tempering treatment" after machining. Hereinafter, the above-mentioned "parts subjected to nitrocarburization treatment" will be simply referred to as "soft nitrocarburized parts". Background technique [0003] Crankshafts, connecting rods, etc. used in automobiles, industrial machinery, and construction machinery are manufactured by forging and machining into desired shapes, and then performing nitrocarburizing instead of quenching and tempering. . In particular, in the manufacture of automobile parts requiring high fatigue strength, wear resistance, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/00C22C38/60C21D9/28C21D9/30C23C8/32C23C8/80C22C38/06C22C38/38C22C38/42C22C38/58C21D1/06C21D2211/002C22C38/001C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16F16C3/06F16C2204/74
Inventor 西谷成史高须贺干长谷川达也祐谷将人泷谷善弘
Owner NIPPON STEEL CORP
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