Title:
MACHINE STRUCTURAL PARTS MADE OF NONMAGNETIC MN-CR STEEL
Document Type and Number:
Japanese Patent JPH04141572
Kind Code:
A
Abstract:
PURPOSE: To produce nonmagnetic machine structural parts each having a desired hardened surface layer by forming a nitrogen enriched layer in the surface of austenitic Mn-Cr steel by nitriding, then carbonitriding.
CONSTITUTION: Austenitic Mn-Cr steel contg. about 10-20% Mn, about 3-20% Cr and about 0-5% Ni is worked into machine structural parts each having a margin for final precision finishing. The steel is then subjected to nitriding as heat treatment and held under heating at about 700-900°C for about 6-12hr in a carbonitriding atmosphere to form a hardened surface layer having ≥55 Rockwell C hardness in ≥2mm thickness. Machine structural parts made of nonmagnetic Mn-Cr steel and usable in a strong magnetic field are obtd.
Inventors:
MAEDA KIKUO
NAKAJIMA HIROKAZU
UEDA AKIFUMI
OKUGAMI KOUICHI
NAKAJIMA HIROKAZU
UEDA AKIFUMI
OKUGAMI KOUICHI
Application Number:
JP26226890A
Publication Date:
May 15, 1992
Filing Date:
September 28, 1990
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
C23C8/24; C23C8/32; F16C33/12; (IPC1-7): C23C8/24; C23C8/32; F16C33/12
Attorney, Agent or Firm:
Hisao Ishii (1 outside)