Title:
材質異方性が小さくかつ強度、靱性および被削性に優れる非調質鋼およびその製造方法
Document Type and Number:
Japanese Patent JP4802435
Kind Code:
B2
Abstract:
Provided is a non heat-treated steel that requires no particular controls over cooling rates and no aging treatments after hot working, that can sufficiently increase tensile strength, yield strength and toughness even at lightly deformed parts, and furthermore, that has excellent material anisotropy and machinability as an alloy steel for machine structures. In other words, it is a non heat-treated steel that contains: C: more than 0.05 mass% to less than 0.10 mass%; Si: 1.0 mass% or less; Mn: more than 2.2 mass% to 5.0 mass%; S: less than 0.020 mass%; Cu: more than 1.0 mass% to 3.0 mass%; Ni: 3.0 mass% or less; Cr: 0.01 to 2.0 mass%; Al: 0.1 mass% or less; Ti: 0.01 to 0.10 mass%; B: 0.0003 to 0.03 mass%; N: 0.0010 to 0.0200 mass%; O: 0.0060 mass% or less; and the balance Fe and inevitable impurities, and that the steel structure is bainitic having block structures at 10% or more in area ratios.
Inventors:
Kazukuni Hase
Yasuhiro Omori
Toshiyuki Hoshino
Yi Geon
Yasuhiro Omori
Toshiyuki Hoshino
Yi Geon
Application Number:
JP2001569428A
Publication Date:
October 26, 2011
Filing Date:
March 22, 2001
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D8/00; C22C38/40; C22C38/42; C22C38/50; C22C38/54; C22C38/58; C22C38/60; C21D8/02; C21D8/06
Domestic Patent References:
| JP2000017376A | 2000-01-18 |
Attorney, Agent or Firm:
Kenji Sugimura
Kosaku Sugimura
Kosaku Sugimura