INDUCTION HARDEN ASTM A514 2

[joebk]

Attempting to replace a European mtrl specification with something commercially available in the USA. ASTM A514 has been suggested due to the fact that the required mechanical properties of ASTM A514 are within spec.

However, the original design required some sections to be induction hardened. Spec is HRC 50 0.3 mm deep, I know HRC is probably not applicable but this is the original spec on the drawing.

Can ASTM A514 safely and successfully induction hardened (without detriment to the core properties)?

It was my understanding that in general carbon content should be between 0.3-0.4% for induction hardening.

Thanks!

 

[metengr]

There are six grades of A 514 steel plate that are supplied in a quenched and tempered condition for use in structural applications (the through hardening characteristics for the A 514 steel grades can result in a hardness range of 280-360 BHN).

You will not achieve 50 HRc on the surface because the carbon content is too low. The A 514 steel plate grades typically contain carbon contents from 0.21 down to 0.15%.

 

[metengr]

Have you considered a 4140 steel plate? This is a workhorse material and responds nicely to induction hardening.

 

[joebk]

4140 is still in the running, as is 8620. The parts need min yield of 116 KSI, so 4140 must be hardened.

Parts are stamped and formed (nothing extreme) prior to hardening so distortion due to hardening process is likely to be a problem.

It is possible that the hardness of the A514 is already sufficient. We are unfortunately trying to revive a very old design so we can only hope to replicate the obscure material specified, no time to fully redesign the part.

 

[EdDanzer]

There is little difference between A514 and 8620’s chemistry and neither will induction to 50RC without carburizing first. C1040/1045 can be induction harden to 50 RC at a much lower material cost but may not be tough enough at 116 KSI core temper to allow stamping.

Ed Danzer

http://www.danzcoinc.com

http://www.dehyds.com