S136 Assab steel sand spot issue
S136 Assab steel sand spot issue
(OP)
Hi all,
We've been experiencing some issues on S136 steel for the past few projects. We have had sand spots(sand like pot holes) on polished surface of S136 steel. The steel were hardened to HRC50. WE're in China and the steel are purchased from dealer in China with cert and everything. So with the Authenticity of steel aside, is there any other cause for this problem?
We've been experiencing some issues on S136 steel for the past few projects. We have had sand spots(sand like pot holes) on polished surface of S136 steel. The steel were hardened to HRC50. WE're in China and the steel are purchased from dealer in China with cert and everything. So with the Authenticity of steel aside, is there any other cause for this problem?






RE: S136 Assab steel sand spot issue
www.doerrenberg.com.sg
RE: S136 Assab steel sand spot issue
By the way, we re-EDM and repolish the surface about 0.02mm altogether and the spots are gone. Apparently its an over-polish issue and not pitting corrosion as we first thought. We're also going to coat this surface to avoid further corrosion issue which we heard are quite common on these stainless steel.