Steel for nitrocarburizing and nitrocarburized parts

A technology for processing parts and nitrocarburization, which is applied in the direction of chemical instruments and methods, coatings, layered products, etc., can solve the problems that have not been specifically disclosed, and achieve the effect of high fatigue strength and small heat treatment deformation

Inactive Publication Date: 2011-06-08
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The crankshaft disclosed in Patent Document 7 has excellent machinability and high fatigue strength despite the nitrocarburizing treatment on the surface, but there is no specific disclosure about the hardened layer.

Method used

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  • Steel for nitrocarburizing and nitrocarburized parts
  • Steel for nitrocarburizing and nitrocarburized parts
  • Steel for nitrocarburizing and nitrocarburized parts

Examples

Experimental program
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Effect test

Embodiment

[0103] Steels having the composition shown in Table 1 were produced.

[0104] In the embodiment shown in table 2, the billet of thickness 50mm is carried out hot rolling under the condition shown in table 2, is made into the steel plate of thickness 25mm, cut into the test piece of Φ 10mm afterwards, carries out cold forging processing, Made into a cold forged part with a thickness of 10 mm and a diameter of 14 mm.

[0105] In the example shown in Table 3, a steel billet of Φ25 mm was hot forged under the conditions shown in Table 3 to make a hot forged part with a thickness of 10 mm and a diameter of 35 mm. Hot forged components are machined into gear shapes after forging. Figure 5 The shape of one tooth 51 on the gear is shown.

[0106] Underlined numerical values ​​and symbols in Tables 1 to 3 are outside the scope of the present invention.

[0107]

[0108] The hardness after hot rolling was obtained by cutting and grinding so that the L cross-section of the test pi...

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Abstract

The present invention relates to a steel material giving more effective case hardening for improving the fatigue strength and is characterized by containing, by mass %, C: 0.01 to 0.3%, Si: less than 0.1%, Mn: 0.4 to 3%, Cr: 0.5 to 3%, and Al: 0.01 to 0.3%, further containing one or both of Mo: 0.2 to 1.5%, and V: 0.05 to 1.0%, having a balance of Fe and unavoidable impurities, and comprising a structure having 50% or more of bainite.

Description

technical field [0001] The present invention relates to a steel for nitrocarburization that has workability and strength and can obtain a deep effective hardened layer, and a nitrocarburized component produced by performing nitrocarburization on the steel for nitrocarburization. Background technique [0002] A large number of parts that have been subjected to surface hardening treatment for the purpose of improving fatigue strength are used in automobiles and various industrial machines. Typical surface hardening methods are carburizing, nitriding, induction hardening, and the like. [0003] Unlike other methods, nitriding treatment is performed at a low temperature below the transformation point of steel, so it has the advantage of being able to reduce heat treatment deformation, but because it is treated at a low temperature, the effective hardened layer becomes shallower. [0004] Nitriding treatment carried out under ammonia atmosphere can obtain high surface hardness, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C22C38/38C22C38/32C23C8/50
CPCC22C38/22B32B15/04C22C38/26C22C38/06C22C38/28C22C38/24C22C38/02C22C38/04C22C38/001C23C8/32C21D2211/002
Inventor 千田彻志久保田学樽井敏三平上大辅
Owner NIPPON STEEL CORP
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