Re Heat Treatment of Stainless Steel Forging

[disisshahid]

In reference to thread367-195557

For a petro-chemical project, we have the following Heat Treatment requirement. Tempering at 740 Deg C for ASTM A182 F11 Class 1 material. However, the material available in market is Tempered at 620 Deg C which is the basic ASTM requirement. Can Re heat treatment(Normalizing and then Tempering at 740 Deg C) be considered a solution ? Will this re-heat treatment change the physical properties of material beyond the requirement ?

 

[metengr]

I would evaluate using only a higher temperature tempering heat treatment on the ASTM A182 F11 Class 1 material to satisfy your client's requirement for tempering at 740 deg C and to avoid having to re-heat treat the forging and risk distortion. This will require mechanical testing to verify compliance with the higher tempering temperature mechanical property requirements. However, this can be done using a coupon of similar material.

 

[EdStainless]

I agree, re-temper only would be the best route.
Get coupons of the material heat treated to the 620 temper and re-temper them at 740 and test them.
They should come out exactly as you expect.

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