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Patent Searching and Data


Title:
METHOD FOR HEAT-TREATING STEEL
Document Type and Number:
Japanese Patent JPH04263009
Kind Code:
A
Abstract:

PURPOSE: To enable heat treatment for steel material of plural kinds of different C contents simultaneously without developing decarbonization and carburization.

CONSTITUTION: Atmospheric gas containing N2 as the main component and a small quantity of CO or CO+H2 is fed into a heating furnace, and during raising temp. of the steel materials to 700°C, composition of an atmospheric gas is controlled so as to satisfy the following conditions, 1 to 4% CO, ≤0.15% CO2, 0 to 4% H2, ≤-20°C dew point and PF:{(%CO)2/(%CO2)}=50 to 250. Under securing this condition, the steel materials are heated to the prescribed temp. exceeding 700°C for heat treatment.


Inventors:
MIZUGUCHI KEIICHI
WATANABE KAZUNORI
SAKO KAZUAKI
Application Number:
JP532091A
Publication Date:
September 18, 1992
Filing Date:
January 21, 1991
Export Citation:
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Assignee:
DAIDO STEEL CO LTD
International Classes:
C21D1/76; (IPC1-7): C21D1/76