Warped thin parts after heat treat.
Warped thin parts after heat treat.
(OP)
I have some 2.25mm thick parts, ring shaped, 1020 steel, that are warping after heat treating.
Case hardening spec.
Nitrocarborize 0.01 to 0.03mm Dep compound depth zone
surface hardness 60 Rc min. (file hard)
Diffusion layer depth 0.15mm min.
oil quenched
The parts are flat (w/in 0.015mm) after being stamped out and I've tried straightening the parts after heat treating. They would either spring back to the warped condition or break in half.
Analysis shows the parts meet the required case hardening specifications. I'm wondering if the stamping operation adds stress to the steel that shows up in heat treating. Should I stress relieve them before heat treating?
Materials isn't really an area of expertise of mine so any ideas would be appreciated.
Thanks.
Case hardening spec.
Nitrocarborize 0.01 to 0.03mm Dep compound depth zone
surface hardness 60 Rc min. (file hard)
Diffusion layer depth 0.15mm min.
oil quenched
The parts are flat (w/in 0.015mm) after being stamped out and I've tried straightening the parts after heat treating. They would either spring back to the warped condition or break in half.
Analysis shows the parts meet the required case hardening specifications. I'm wondering if the stamping operation adds stress to the steel that shows up in heat treating. Should I stress relieve them before heat treating?
Materials isn't really an area of expertise of mine so any ideas would be appreciated.
Thanks.





RE: Warped thin parts after heat treat.
RE: Warped thin parts after heat treat.
RE: Warped thin parts after heat treat.
One of the best at this is Ken Lloyd of Peerless Saw Co. in Groveport,800 973-3753 Ohio. He said he’d be happy to talk to you although he wasn’t sure how much he could help you. They laser cut and heat treat saw blades, they don’t stamp but they do know heat treating of flat parts.
tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: Warped thin parts after heat treat.
Would clamping these parts and reheating them save ones that have already been warped? I have like $10k in parts that are out of spec I would like to save if possible.
Thanks again, this project just kind of got dumped on me after the bad parts were produced.
RE: Warped thin parts after heat treat.
RE: Warped thin parts after heat treat.
Is this your company’s operation? What does the steel supplier say? How soft is the steel when stamped?
Steel has stresses in it.
1. Steel is never perfectly flat or perfectly homogenous.
2. Steel is rolled which induces stress. (We are fighting a project now where the direction of the original rolling determines the kind of warping we get after brazing.)
3. Uncoiling and straightening add stresses.
4. Stamping or laser cutting add stresses.
5. Heat treating releases stresses but may release stress unevenly.
Peerless has been a good supplier of ours for many years. I believe they have stress relief process before they laser cut the parts. They stress relief afterwards as well.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
RE: Warped thin parts after heat treat.