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Anonymous Poster

Material Specification for Gate Valve

05/31/2006 8:25 AM

jalel dhaouadi writes:
For gate valves 6'' API 6D design WE asked for a body A216WCB and solid wedge disc A182 F6.
We received an offer body A216WCB and disc flexible wedge WCB+13%Cr.
Could anyone help to explain the difference between the two disc specs and if the offered is acceptable from material equivalence point of view?
NB for the stem the offer was as asked A182F6.

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Active Contributor

Join Date: Jun 2006
Posts: 10
#1

Gate Valve Spec

06/01/2006 10:16 AM

Spoke to an engineer on our staff who handles these items and he replies: Hi Ken, Body specification is offered as the same (i.e. A216WCB, the original specification for the flexible wedge is ASTM A182 F6, and what was offered is WCB+13% Cr. If I look at the specification in detail for ASTM A182 F6 the actual material is a 13% Chromium Alloy steel, so in other words I believe they are getting what they asked for. Cr13, 410ss, or F6 ASTM A182-F6a This is the most common trim material for carbon steel valves. C Mn P S Si Cr Mo Ni ASTM A182-F6a 0.15 max 1.00 max 0.04 0.03 1.00 max 11.5 to 13.5 ... 0.50 max Carbon Manganese Phosphorus Sulpher Silicon Chromium Molybdenum Nickel This reference information may be used as a guide only. Before specifying any material for a given application all factors must be taken into consideration and the proper ASTM, API, ANSI, ASME, MSS, or other related specifications must be consulted. Tony

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Participant

Join Date: Jul 2006
Posts: 2
#2
In reply to #1

Re:Gate Valve Spec

07/12/2006 2:03 AM

I think there is no harm in using WCB+13%Cr. This is now common spec every body fllows to reduce cost of forging and flexible wedge gives better life in high teperatures as compared to solid wedge.And size is not small it is 6" and with offered spec I think you are paying less compared to specs.

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Anonymous Poster
#3
In reply to #1

Re: Gate Valve Spec

06/14/2007 8:32 AM

Can we use Stellite 6 insted on 13% cr

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Anonymous Poster
#4

Re: Material Specification for Gate Valve

06/14/2007 8:34 AM

No please explain me

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Anonymous Poster (2); Ken (1); Raj100 (1)

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