Title:
【発明の名称】破壊靭性を向上させた深硬化鋼
Document Type and Number:
Japanese Patent JPH05507125
Kind Code:
A
Abstract:
A deep hardening steel has a composition comprising, by weight, about 0.26% to 0.37% carbon, about 0.5% to 1.0% manganese, about 1.0% to 3.0% silicon, about 1.5% to 2.5% chromium, about 0.3% to 1.0% molybdenum, from 0.05% to 0.2% vanadium, from 0.03% to 0.1% titanium, from 0.01% to 0.03% aluminum and at least 0.005% nitrogen. Also, the composition preferably contains less than about 0.025% each of phosphorus and sulfur. After quenching and tempering, articles made of this material are substantially free of aluminum nitrides, have a fine grained microstructure, and a combination of high hardness and fracture toughness. The deep hardening steel article embodying the present invention is particularly useful for ground engaging tools that are subject to breakage and abrasive wear at high temperature.
Inventors:
McBiker, Joseph E.
Application Number:
JP51852191A
Publication Date:
October 14, 1993
Filing Date:
October 21, 1991
Export Citation:
Assignee:
Caterpillar Incorporated
International Classes:
C22C38/00; C22C38/34; (IPC1-7): C22C38/00; C22C38/34
Attorney, Agent or Firm:
Aoki Akira (3 outside)