Heat Treatment of SS 420 2

[Salmet]

Dear Members, please suggest suitable heat treatment of stainless steel 420 grade we have been quenching and tempering it to achieve UTS in excess of 1300 Mom and need % elongation of 8... Results are never stable wrt to elongation while we consistently achieve its required hardness. Thanks in advance

 

[EdStainless]

Have you tried different austenitizing temps?
Are you sure that you are getting a complete quench?
What is your temper temperature?

Very small changes in C can change HT response a lot.
Typically for 0.35% C I would start with a 1850F aust, it should quench to 53-56 HRC.
Then temper for 2hr at 900F as a starting point.

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

http://www.crucible.com/PDFs/DataSheets2010/Data Sheet 420.pdf

 

[Salmet]

Thank you very much Edstainless and metengr for your kind help.