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Re: [MW:3745] Bolts/Nuts Material

By Materials & Welding
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?

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

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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.

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