Material Heat treatment of Martensitic Stainless Steel castings

[AJIRAJ NATARAJAN]

Dear Experts.

We have purchased martensite SS Cast components complying to 1.4405 (GXCrNiMo16-5-1)

However, the manufacturer did not carry out the tempering as required in the specification. We tried to carry out the missing heat treatment locally in UAE and see if the results are satisfactory.

The following cycle was used.

Holding temp-630C, Duration 1 hr 30 minutes, heating rate from 300 C-100/hr.

The test results after the tests are as given 

UTS is 1004 N/mm2, Elongation- 6.4% and hardness 376 HV10.

The required elongation is minimum 15% and hardness below 240 HV10.

Please advise the Heating cycle that is to be followed to achieve the above values.

Looking forward to hearing your feedback.

Best regards.

 Aji