The basic difference is that 316 is austenitic SS v/s 13Cr gives a martensitic stainless steel - for valve seat applications, hardness is the main requirement hence the substitution with any other type of martensitic type SS will be accepted.
Date: Mon, 25 Feb 2008 02:15:53 -0800
Subject: [MW:604] Re: 13% Cr steel valve trims
To: email@example.com; firstname.lastname@example.org
Dear Ravi,If a steel contains 13% Cr. it means it is stainless Steel.The material specifications provided by your vendor are adequate. You may even use SS304 grade.Regards,
ravi kiran yeleswarapu <email@example.com> wrote:Gents,Best regards,
Please share your views on following:
"As per specs valve trims are required to be of 13% Cr steel" no further details given w.r.t. material specs nor clarified with client then.
However vendor has supplied A276-316 for stem and A351 CF8M for disc.
Are above acceptable as per spec of 13% cr steel.
As per client's interpretation of 13% Cr steel means AISI 410 or equivalent but not 316.
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