Tuesday, March 15, 2011

Re: [MW:10352] Basic Question

Dear Mr Murugesan,
                            Then what is SB, SC & SD in ASME, where some are developed entirely by ASME. Please explain.

2011/3/14 murugesan jeyaraman <jmurugesan@gmail.com>
Hi
 
SA does not mean Section " A"  It is a wrong understanding.
 
There is a standard called ASTM International (ASTM),  known as the American Society for Testing and Materials.
It is an  international standards organization that develops and publishes technical standards for a wide range of materials, products, systems. For example A106, A105, A517 and etc...
 
Here, " A " refers it is ASTM standard, and the number 106, 105, 517 are the designation given to particular type of materials, like  naming that pariticular product with some numbering convention.
 
A 106 - Covers seamless carbon steel pipe for High temperature service
 
A 516 - cover carbon steel plates for High temperature service
 
Refer ASME sec II part A for details about this specifications.
 
Now comes to "SA"  - ASME adopts the above ASTM standard and rename the designation by  putting "SA" to same ASTM standards numbers. now it is called SA106, SA 516 and so on... for your case SA 387 This is spec for  pressure vessel plates of Chromium-Molybdenum
 
Gr-22    This refers to Grade of materials within that specification, There various grades like GR11, Gr 22, Gr 91 , Gr 5, Gr 9 and so on- this classified based on cromium content,
 
Class -2 - Above Gr 22, 22, 9, 91 materials further categorised as class 1 and class 2 based on Mechanical properties(Tensile and Yield strength)
 
B3 - alloying charactersitics for Gr 22 materials (2 1/4 chrome  1 Moly).
 
Piece of advise: You are in learning stage, you have to study more codes and standards, If you are working in a ASME accredited workshop or in a workshop that do  Boiler pressure parts, you will learn a lot ....
 
Or there are lot of online guides, please refer to those guides for basics, you read yourself from codes and standards.
 
Thanks
 
Murugesan
 
 
 
On Sat, Mar 12, 2011 at 8:03 PM, <fire_praves@indiatimes.com> wrote:
Dear Sir s

As I am a novice, please help in some basics

I have come across a material of Specification
SA 387 Gr22 Class 2

Please tell me what is denoted by 387, Gr 22 and Class 2.
Do these figures have any thing to do with strength or chemical composition?

Also for welding this material to a material of same specification, E9018 B3 is mentioned.

Please tell me what is denoted by B3?


Regards,
prv

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regards,
Harish.

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