Title:
HIGH STRENGTH NON-HEAT TREATED STEEL FOR STEEL TUBE
Document Type and Number:
Japanese Patent JPH10324946
Kind Code:
A
Abstract:
To provide a high strength non-heat treated steel for steel tube, having toughness and weldability as well as sufficient strength and capable of being induction hardened.
This high strength non-heat treated steel for steel tube has a composition which consists of, by weight ratio, 0.35-0.45% C, 0.10-0.80% Si, 1.2-2.0% Mn, ≤0.035% S, 0.3-0.8% Cr, 0.05-0.30% V, 0.01-0.05% Al, 0.008-0.050% N, and the balance Fe with inevitable impurities and in which the carbon equivalent Ceq, represented by Ceq=C+1/7Si+1/5Mn+1/9Cr+1/2V, is regulated to 0.83 to 0.90 and also the amount dT of inclusions based on the JIS point counting is regulated to ≤0.12.
Inventors:
OKAWA KAZUHIDE
MIYAMOTO MASAKI
AOTA TAKANORI
MIYAMOTO MASAKI
AOTA TAKANORI
Application Number:
JP13719497A
Publication Date:
December 08, 1998
Filing Date:
May 27, 1997
Export Citation:
Assignee:
KOMATSU MFG CO LTD
SANYO SPECIAL STEEL CO LTD
SANYO SPECIAL STEEL CO LTD
International Classes:
C21D8/10; C22C38/00; C22C38/38; (IPC1-7): C22C38/00; C21D8/10; C22C38/38
Attorney, Agent or Firm:
Tsutomu Inoue
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