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Hydrogen Embrittlement- Steel Alloys

Hydrogen Embrittlement- Steel Alloys

Hydrogen Embrittlement- Steel Alloys

(OP)
I have a SCM435 part that is loaded in shear which I'm concerned about hydrogen embrittlement. Hardness is specified at HRC: 28-32. Finish is Ni-SnCO Barrel plating. The material and finish were shosen for their yield strength and toughness.

My questions are:

1) Do my specs lend a part that is susceptible to hydrogen embrittlement?
2) If so, is there a better material and/or finish to reduce or eliminate this concern?

Thanks in advance

RE: Hydrogen Embrittlement- Steel Alloys

Hydrogen embrittlement manifests itself under conditions of tensile loading. If your part is actually loaded in pure shear and there are no residual tensile stresses, you should not have a problem. Even with tensile stresses, your hardness is at the very bottom end of the range where hydrogen embrittlement would be a concern. Is the barrel plating process electrolytic or is it mechanical plating?

RE: Hydrogen Embrittlement- Steel Alloys

(OP)
Well, the loading may be better described as shear and some bending with tensile on one half of a cylinder. Right, I chose that hardness range to meet strength requirements and minimize HE. The plating is electrolytic.

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