Method for reducing stress corrosion cracking in high-temperatur

Details Method for reducing stress corrosion cracking in high-temperatur Method for reducing stress corrosion cracking in high-temperatur

1982-04-26

1984-04-24

Camby, John J.

Heating

Processes of heating or heater operation

Of heating a fluid

266 44, F24H 700, C21B 1300

Patent

active

044445555

ABSTRACT:
Stress corrosion cracking which occurs in metallic portions of a high-temperature regenerative air heater can be alleviated by the disclosed methods. The methods include the step of storing a gas charge within a heated regenerative air heater, which gas charge is substantially devoid of free oxygen. The substantial absence of free oxygen from the gas charge prevents or reduces formation of nitrogen-containing oxides which typically form within an air-containing gas charge stored in a regenerative air heater held at high temperature. Conditions conducive to stress corrosion cracking are thereby alleviated by reduction of these nitrogen-containing oxides which are precursors to corrosive acids. The methods are particularly suitable for reducing stress corrosion cracking in blast furnace stoves.

REFERENCES:
patent: 3746503 (1973-07-01), Miyashita et al.
patent: 4022573 (1977-05-01), Kuntziger

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