High-temperature steel for boiler making

Details High-temperature steel for boiler making High-temperature steel for boiler making

1995-03-07

1996-11-12

Yee, Deborah

Metal treatment

Stock

Ferrous

C22C 3822, C22C 3824, C22C 3828

Patent

active

055736050

ABSTRACT:
A high-temperature steel for boiler making having improved creep strength and low tendency to hardening in welded condition, having the following melt analysis (wt. %):
C 0.050 to 0.100%
Si 0.15 to 0.45%
Mn 0.30 to 0.70%
P .ltoreq.0.020%
S .ltoreq.0.010%
Al .ltoreq.0.020%
Cr 2.20 to 2.60%
Mo 0.90 to 1.10%
V 0.20 to 0.30%
Ti 0.05 to 0.10%
B 0.0015 to 0.0070%
N .ltoreq.0.01%
The balance of the steel is comprised of iron and ordinary impurities. The steel is annealed for a period of about 30 to about 60 minutes at about 980.degree. C. to about 1040.degree. C., thereupon cooled in air, and then tempered for at least one hour at about 730.degree. C. to about 760.degree. C.

REFERENCES:
patent: 4799972 (1989-01-01), Masuyama et al.
patent: 5211909 (1993-05-01), Iseda et al.

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