ROLLED STEEL BAR OR WIRE ROD FOR HOT FORGING - NIPPON STEEL & SUMITOMO METAL CORP

Title:

ROLLED STEEL BAR OR WIRE ROD FOR HOT FORGING

Document Type and Number:

Japanese Patent JP2013040364

Kind Code:

A

Abstract:

To provide a rolled steel bar or wire rod for hot forging, which has high bending fatigue strength, contact fatigue strength and machinability, and in which heat treatment strain can be reduced.

The rolled steel bar or wire rod for hot forging comprises, by mass, 0.10 to 0.30% C, 0.30 to 0.60% Si, 0.60 to 1.00% Mn, 0.003 to 0.050% S, 1.50 to 2.00% Cr, ≤0.10% (including 0%) Mo, 0.010 to 0.050% Al and 0.0100 to 0.0250% N, and the balance Fe with impurities, and in which fn defined by formula (1): fn=Cr+2×Mo is 1.60 to 2.10. Further, a differential value between the maximum value and the minimum value is ≤10 in Ms values defined by formula (2): Ms=550-361×C-39×Mn-20×Cr-5×Mo in a plurality of measurement positions C1 to C17 in the cross-section CS of the steel bar or wire rod having a radius R.

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Inventors:

USUI YUSUKE
OFUJI YOSHIHIRO
OHASHI TETSUYA

Application Number:

JP2011176806A

Publication Date:

February 28, 2013

Filing Date:

August 12, 2011

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP

International Classes:

C22C38/00; C22C38/60

Domestic Patent References:

JP2010070827A	2010-04-02
JP2009263767A	2009-11-12
JP2009127095A	2009-06-11
JP2010150566A	2010-07-08
JP2010070827A	2010-04-02
JP2009263767A	2009-11-12
JP2009127095A	2009-06-11

Attorney, Agent or Firm:

Hidetoshi Ueba
Takao Matsuyama
Go Sakane
Kawakami Keiko
Tadashi Takezoe

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