[MW:18699] RE: 18696] Query regarding valve material with dual certification

Carbon content is low enough to be below the maximum carbon of CF-3M but tensile properties are high enough to meet the minimum requirements of CF-8M. Therefore it can be dual certified.

Wrought corollary is 316L and 316. This is common practice and you will especially see it for 304 and 304L.

John A. Henning

Welding & Materials

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Gurunath Hanamar
Sent: Wednesday, September 18, 2013 7:03 AM
To: materials-welding@googlegroups.com
Subject: [MW:18696] Query regarding valve material with dual certification

Dear Experts,

Dear All,

We are having valve with body material requirement as A351 CF8M but we have got a body which is dual certified for A351 CF3M as well as CF8M & it is embossed on the body as A351 CF3M / CF8M.

Problem here is TPI is telling us client requirement is A351 CF8M only, so body should be embossed with only A351 CF8M so grind CF3M embossing on the body of all the valves.

Kindly please help me with code reference's if available regarding dual certification & acceptable clause. Else please give more information(picture) regarding dual certification & how it came into practice.

Thanks in advance for your valuable time.

ವಂದನೆಗಳೊಂದಿಗೆ / Best regards,

Gurunath Hanamar

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