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Maximum hardness value for P1 materials

Maximum hardness value for P1 materials

Maximum hardness value for P1 materials

I need a code or standard specify the maximum value of hardness after PWHT on P1 materials.
In many specs. it is 200 BHN but no official reference has been mentioned.

RE: Maximum hardness value for P1 materials

NACE MR0103, 2.1.7/ ISO 17945, for stress relief of cold formed items

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.

RE: Maximum hardness value for P1 materials

NACE SP 0472
API RP 582

These are recommended practices and standard practices. I believe they limit the hardness to 200 BHN in cracking environments, otherwise it is 225 BHN.

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