Heat Resisting Austenitics - Fabrication

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Thermal processing and fabrication

 

ANNEALING

Annealing of the heat resisting austenitics is achieved by heating to between 1 030°C and 1 150°C for 60 minutes per 25mm thickness (2.5min/mm) followed by water quenching. Annealing will ensure that any carbide precipitates are taken back into solution.

HOT WORKING

The heat resisting austenitics can be forged, hot headed and upset satisfactorily. Uniform heating of the steel in the range of 1 150°C to 1 250°C is required. The finishing temperature should not be below 950°C. Forgings should be cooled rapidly in air or water.

COLD WORKING

The heat resisting austenitics can be deep drawn, stamped, headed and upset without difficulty. Since austenitic stainless steels work harden, severe cold forming operations should be followed by annealing.

MACHINING

Like all the austenitic stainless steels, this alloy group machines with a rough and stringy swarf. Rigidly supported tools with as heavy a cut as possible should be used to prevent glazing.

WELDING

The heat resisting austenitics can be satisfactorily welded and brazed by all methods, giving a tough weld. Welding procedures for the U-310S types have to be selected with care in order to avoid hot cracking due to the fully austenitic weld microstructure obtained from using matching filler metals.