Welding Q&T steels
Welding Q&T steels
(OP)
I have a low alloy boron steel with carbon 0.15-0.21% and Cr-0.8%, Mn-1.2%, after quenching I get a hardness of 40-44 HRC.
I have two situations 1) temper at high temperatures (>750 F) to say 34-37 HRC to soften the martensite and to improve the toughness or
2) temper at lower temperatures (~400-450F) and keep the hardness around 40-44HRC
So now, is one better than the other if I also wanted this steel to be weldable? in other words does the softer more tougher martensite is better for welding compared to the hard martensite?
Thanks in advance!
I have two situations 1) temper at high temperatures (>750 F) to say 34-37 HRC to soften the martensite and to improve the toughness or
2) temper at lower temperatures (~400-450F) and keep the hardness around 40-44HRC
So now, is one better than the other if I also wanted this steel to be weldable? in other words does the softer more tougher martensite is better for welding compared to the hard martensite?
Thanks in advance!





RE: Welding Q&T steels
If this is an air hardening steel, then after welding you could re-temper at the same temp to improve the ductility of the HAZ.
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Plymouth Tube
RE: Welding Q&T steels
RE: Welding Q&T steels
Additional info: they are water spray quenched.
EdStainless, is there a specific reason why we prefer the softer martensite and does the toughness increase because of high temperature tempering have any effect on the weldability?
metengr, thanks and yes strict weld procedures should help the issue here. But I am also looking for an explanation on why we in general go for softer martensite eve if the carbon equivalent is <0.5? why not temper at low temperatures and still keep the strength and hardness as well if there is no issues in welding? again ==> tougher martensite has effect on weldabiliy?
Cheers
RE: Welding Q&T steels
RE: Welding Q&T steels
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Plymouth Tube
RE: Welding Q&T steels