430 430F Thermal Processing

1. Annealing

Annealed 430 is in the softest and most ductile condition, and may be used for cold-working operations. The annealing temperature range is 760oC followed by cooling in air. Soak at 1500 F, furnace cool (50 F/hour) to 1100 F, then air cool.

2. Stress relieving

Stress relief after welding is not usually required, although 200-300oC is the recommended stress relieving temperature range.

3. Hot working

Initial forging and pressing temperature range:    1100  - 1150oC
Finishing temperature:                                        below 750oC

Generally the recommended method of hot forming is to work the material at between 1300 and 1500 F. Hot forming is only required on heavy sections

Avoid extended holding times above 1000oC as excessive grain growth takes place, which severally reduces ductility

Note: Soaking times to ensure uniformity of temperature are longer for stainless steel than for carbon steels. Use up to 1/2 times the time employed for the same thickness of mild steel.

Cold Working

430 can readily be fabricated by cold working. Typical operations include bending, forming, deep drawing and upsetting.

Hardening

430 does not respond to hardening by heat treatment.

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