316 SS RoHS Compliance
316 SS RoHS Compliance
(OP)
I have a general question about a 316 stainless steel part we will be fabricating that we require to be RoHS compliant for our customer's application. The RoHS directive restricts the use of certain hazardous substances to the following levels for stainless steel:
Lead – Pb 0.35%
Mercury – Hg 0.1%
Cadmium – Cd 0.01%
Hexavalent chromium – Cr (VI) 0.1%
Polybrominated biphenyls – PBB 0.1%
Polybrominated diphenyl ethers – PBDE 0.1%
In our drawing, we have specified 316SS as per ASTM spec A240 where the relative concentrations of alloying elements are described. However, for a lot of materials in that spec, there is a large concentration of "other" which is why I am concerned. For 316 stainless it is more than 50% by weight devoted to "other". How do I know that the "other" portion of the material is primarily iron and not a prohibited amount of mercury, cadmium or anything else prohibited by RoHS? Any help would be greatly appreciated.
Lead – Pb 0.35%
Mercury – Hg 0.1%
Cadmium – Cd 0.01%
Hexavalent chromium – Cr (VI) 0.1%
Polybrominated biphenyls – PBB 0.1%
Polybrominated diphenyl ethers – PBDE 0.1%
In our drawing, we have specified 316SS as per ASTM spec A240 where the relative concentrations of alloying elements are described. However, for a lot of materials in that spec, there is a large concentration of "other" which is why I am concerned. For 316 stainless it is more than 50% by weight devoted to "other". How do I know that the "other" portion of the material is primarily iron and not a prohibited amount of mercury, cadmium or anything else prohibited by RoHS? Any help would be greatly appreciated.





RE: 316 SS RoHS Compliance
RE: 316 SS RoHS Compliance
Unless you have been dry grinding or cutting and leaving dust on the parts that contains Cr+6.
There is no detectable Pb, Hg or Cd in stainless.
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Plymouth Tube
RE: 316 SS RoHS Compliance
RE: 316 SS RoHS Compliance
So, can I assume that the "other" is pure iron for 316 stainless?
RE: 316 SS RoHS Compliance
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Plymouth Tube
RE: 316 SS RoHS Compliance
Other than the lead (Pb) concentration, RoHS does not pertain to bulk metals like steel or stainless steel alloys. Cd, Hg, Cr6+, PBB, and PBDE only pertain to polymers, coatings or surface contamination, not the bulk metal.