Re: [MW:3739] Bolts/Nuts Material

I was referring coating of HDG/Cd Plating on CS bolts only i.e.a193GRB7 and not on B8 bolts which are ss.HDG/Cd plating shall not be any issue on A193B7 bolts.

Regards

Aarpee

On Wed, Nov 25, 2009 at 11:41 AM, Ohm-Srinivasulu. K <nirgunaya@yahoo.com> wrote:

RP,   Thanks, I should not deviate from company specs, what I can do is whether to approve the vendor proposal or not. on A193 GR. B8 HDG may not stick unless zinc penetrates the passive oxide film on SS Does A193 Gr. B7 material can be HDG? ohm guru namasivaya --- On Wed, 11/25/09, Ramprasad Chari <ramprasad.chari@gmail.com> wrote: From: Ramprasad Chari <ramprasad.chari@gmail.com> Subject: Re: [MW:3732] Bolts/Nuts Material To: materials-welding@googlegroups.com Date: Wednesday, November 25, 2009, 9:26 AM Zinc Electroplating is not a very durable/useful coating.Its thk is also around 15 microns only.Better ones are Cadmium Plating,Hot Dip galvanizing and Barium carbonate coating. Regards Aarpee On Tue, Nov 24, 2009 at 6:30 PM, Ohm-Srinivasulu. K <nirgunaya@yahoo.com> wrote: HI,   I want to clarify a deviation request from Valve vendor, As per the client specs,   For Bolting for Bonnet, Packing-box etc All carbon steel or low alloy steel bolting shall be zinc plated(elctro-deposited), bichromated.   but vendor is proposing   Our proposal for A216 WCC Body (Non-Sour) as follows; Body Studs & Nuts (21000 Series): A193 Gr.B7 / A194 Gr.2H zincplated (without chromated) Body Studs & Nuts (35002 Series): A193 Gr.B8 CL.1 / A194 Gr.8 Gland Studs & Nuts : A193 Gr.B8 CL.1 / A194 Gr.8   so my dout is in humid areas like Japan we need the bolts to be Zincplated/bichromated to prevent white rust and in hot areas like Qatar its not required.  Please confirm my understanding, (As the specs were basically developed by JGC they specified as zinc plated/bichromated)     Ohm-Srinivas Sr. Piping Engg. ohm guru namasivaya -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.