BLACK OXIDE ON 4140 PH
BLACK OXIDE ON 4140 PH
(OP)
WILL THE A CALL OUT FOR BLACK OXIDE GIVE THE SURFACE RESISTANCE TO RUSTING?
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RE: BLACK OXIDE ON 4140 PH
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: BLACK OXIDE ON 4140 PH
RE: BLACK OXIDE ON 4140 PH
RE: BLACK OXIDE ON 4140 PH
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P.E. Metallurgy, Plymouth Tube
RE: BLACK OXIDE ON 4140 PH
RE: BLACK OXIDE ON 4140 PH
You didn't provide the process spec for your black oxide coating, but MIL-DTL-13924 is a commonly used one. Your 4140 Pre Hardened material would use MIL-DTL-13924 class 1. If the final material hardness is >Rc39, you will also require hydrogen embrittlement relief treatment.
I would highly recommend taking some time to educate yourself a bit about the black oxide process and the coating characteristics. Understanding the process steps, quality assurance requirements, specifying supplementary treatment, etc. will be very helpful when specifying the coating on your engineering documentation and preparing vendor work orders so that your delivered product is exactly what you want. MIL-HDBK-205 is an excellent reference on the subject.