Title:
高硬度高靭性鋼
Document Type and Number:
Japanese Patent JP4812220
Kind Code:
B2
Abstract:
In order to provide a high-hardness, high-toughness steel, Si, Al, Cr, Mo, V, W, Ni, and Co are more appropriately added so that the steel can have an HRC hardness of 50 or higher and a Charpy impact value of 5 kgf m/cm<2 >or more by tempering at a high temperature of 600° C. or higher. The steel is a martensite steel containing at least C: 0.15 to 1.2% by weight and Si: 0.05 to 1.8% by weight, wherein Si is partially replaced by 0.15 to 1.6% by weight of Al. The steel further contains Ni: 0.3 to 2.5% by weight; Cr: 0.1 to 3.5% by weight; Mo: 0.1 to 1.7% by weight, wherein the amount of Mo is not more than the upper limit determined by the relation formula: Mo(% by weight)=1.7-0.5x(Si(% by weight)+Al(% by weight)); one or both of V: 0.05 to 0.40% by weight and W: 0.1 to 1.0% by weight; at least one alloying element of Mn, Co, Cu, Ti, B, and Nb; inevitable impurities including P, S, N, and O; and the balance consisting essentially of Fe.
More Like This:
Inventors:
Takayama Takemori
Application Number:
JP2002135274A
Publication Date:
November 09, 2011
Filing Date:
May 10, 2002
Export Citation:
Assignee:
KOMATSU LTD.
International Classes:
B25D17/02; C22C38/00; C21D1/06; C21D6/00; C21D9/00; C21D9/22; C21D9/32; C21D9/42; C22C38/22; C22C38/30; C22C38/54; C23C8/22
Domestic Patent References:
| JP578781A | ||||
| JP8295990A | ||||
| JP4857816A |
Attorney, Agent or Firm:
Tsutomu Inoue