RP,Thanks, Any one have idea about what will be cost difference incurred for HDG & Cadmium plating. and can we use Cadmium plating for bolts on high temp service (165ºC) Thanks,
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:3739] Bolts/Nuts Material
To: materials-welding@googlegroups.com
Date: Wednesday, November 25, 2009, 3:15 PM
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?
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 |
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