INDUCTION HARDENED CRANKSHAFT AND METHOD FOR PRODUCING MATERIAL FOR INDUCTION HARDENED CRANKSHAFT

Title:

INDUCTION HARDENED CRANKSHAFT AND METHOD FOR PRODUCING MATERIAL FOR INDUCTION HARDENED CRANKSHAFT

Document Type and Number:

WIPO Patent Application WO/2020/004060

Kind Code:

A1

Abstract:

Provided is an induction hardened crankshaft having an excellent balance of fatigue strength, machinability, and quenching crack resistance. The induction hardened crankshaft has a chemical composition containing, in mass%, 0.30-0.60% of C, 0.01-1.50% of Si, 0.4-2.0% of Mn, 0.01-0.50% of Cr, 0.001-0.06% of Al, 0.001-0.02% of N, 0.03% or less of P, 0.005-0.20% of S, and 0.005-0.060% of Nb, with the remainder comprising Fe and impurities, wherein the microstructure of non-induction hardened portions is mainly composed of ferrite/pearlite, the fraction of ferrite, Fα, satisfies expression (1) below, the microstructure of induction hardened portions is mainly composed of martensite or annealed martensite, and the grain size of prior austenite is 30 μm or less. (1): Fα≥-150×[C%]+84, wherein [C%] is the content (in mass%) of C in the induction hardened crankshaft.

More Like This:

JPH0649235	INDUSTRIAL APPLICABILITY [Title of invention] Method for producing crude steel
JPH10204540	PRODUCTION OF COLD ROLLED HIGH-CARBON STEEL STRIP
JP2602894	INDUSTRIAL APPLICABILITY: Extrusion pin for plastic molding

Inventors:

KUBOTA MANABU (JP)
MAEJIMA TAKETO (JP)

Application Number:

PCT/JP2019/023491

Publication Date:

January 02, 2020

Filing Date:

June 13, 2019

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C22C38/00; C21D8/00; C22C38/60; F16C3/06

Domestic Patent References:

WO2016098143A1

2016-06-23

Foreign References:

JP2010280978A	2010-12-16
KR20100127548A	2010-12-06
KR20100041499A	2010-04-22
KR20110139530A	2011-12-29
JP2018141216A	2018-09-13