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Re: [MW:12719] Material Selection

By Materials & Welding
Hi Vijay,

Please find below response:-

1:- Google "Material Selection for xyz service" and you will get loads of stuff to study, very fundamental question.

2:- PWHT is generally not required for mentioned grade, but sometimes required in special services to achieve higher corrosion resistance which would require approval from Customer, also Hold time and temperature range shall be carefully selected to avoid sensitisation.

3- A387 is low alloy pressure vessel plate used at elevated temperatures, Gr. 22 has higher allowable stresses at given temp. than Gr 11 (please review ASME Sec II part D).

Regards
Manpreet Singh


From: Vijay Katkar <katkar.vijay22@gmail.com>
Sent: Tue, 18 Oct 2011 13:49:43
To: materials-welding@googlegroups.com
Subject: [MW:12690] Material Selection
Dear Allr,

Anybody Can Advice following points
  1. Sir how do we select the materials for the process equipments and what is the criteria for selection of materials ? If you have good literature on this topic, please forward it to me or send me some good links.

  1. In ASME code for Austenitic stainless steel ( 18Cr-8Ni) no PWHT requirement is given, it says PWHT is neither permitted nor prohibited, but my service requires PWHT so how should we perform the PWHT and what are the factors should i consider while ordering the materials.
  1. Sir can you put some light on LAS materials ( 2 1/4 Cr - 1Mo and 1 1/4 - 1/2 Mo), like what is the difference and when should we choose SA 387 Gr.11 CL.1 / CL.2 and SA 387 Gr.22 CL.1/ CL.2 ?


Regards
Manpreet Singh


Sir please shear your experience of above points.

Regards


Vijay Katkar

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