30msv6

[mali325]

dear sirs
one of microalloyed steels is 30msv6(according to pegeot standar).Recommended heat treatmet for yield(Min.580n/mm^2) and tensile is as followinh:
heating: 1100-1200o/C----> still in air

what means still in air?( is it important to know cooling rate)

Best regards

 

[TVP]

Still air means no movement/circulation/velocity. If there is no cooling rate specified in the standard, then it is not important. Accelerated cooling by fan or other means is not recommended.

 

[mali325]

Dear sirs
Thank you for your answere,but Is it possible to have following mechanical properties for this steel grade when it cool in still air:
Yield point:Min. 580N/mm^2
Tensile:850-1000N/mm^

Best Regards

 

[yates]

For 30MSV6, the properties you mention will not be obtained by austenization and still air quench only, some tempering will be required.

 

[mali325]

dear yates,
I think,your idea is that mentioned properties made in quenched in oil and then tempering.