Method for thermal treatment of alloy for heat transfer pipes

Details Method for thermal treatment of alloy for heat transfer pipes Method for thermal treatment of alloy for heat transfer pipes

1985-11-15

1987-12-22

Dean, R.

Metal treatment

Compositions

Heat treating

148158, 148162, C22F 110

Patent

active

047145013

ABSTRACT:
An alloy for heat transfer pipes excellent in an alkali stress corrosion cracking resistance which is obtained by heating and retaining said alloy at a temperature within the range of a temperature (T.degree.C.), at which a carbide in said alloy is thoroughly solubilized, to T+100.degree. C. for 1 minute or more; cooling it once to a level of 200.degree. C. or less; and carrying out a thermal treatment under conditions within a hatched range Z in FIG. 2, said alloy comprising: in terms of % by weight, 0.15% or less of C; 1.0% or less of Si; 1.0% or less of Mn; 25 to 35% of Cr; 40 to 70% of Ni; 0.5% or less of Al; 0.01 to 1.0% of Ti; 0.5 to 5.0%, in all, of one or more of Mo, W and V; 0.30% or less of P; 0.020% or less of S; and the residue of Fe and impurities.

REFERENCES:
patent: 3303531 (1967-02-01), Ogden
patent: 3573901 (1971-04-01), Economy

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