Vacuum degassing 1

[ElCidCampeador]

Hi, I have a seamless pipe A 106 gr.B and I need to determine if it was subjected to vacuum degassing process by steelmaker. I don't have any clues or certificates, just the pipe itself. Do you know any kind of mechanical/chemical test in order to demonstrate it? Thank you

 

[SJones]

Probably, the best you will get is information with which to make a judgement on the likelihood of the material having received such a treatment. Things could get a bit expensive for a piece of A106 GrB. Firstly, the low grade of the material is suggestive of degassing not being applied. You will then need a hydrogen, oxygen, nitrogen, sulphur chemical analysis, say ASTM E1016 related, followed by a bit of metallography, ASTM E45. A person with substantial steelmaking experience should then be able to suggest a likelihood.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[EdStainless]

It will cost less to buy a new piece of pipe.
In the end there is no definitive way to know, just professional hunch.


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P.E. Metallurgy

 

[ElCidCampeador]

It will cost less to buy a new piece of pipe.

mmm no, because all of my suppliers don't have it and I need only a few meters (So I can't go directly to the steelmakers and ask for this small quantity...).

 

[EdStainless]

If you can't find it then you probably don't have it.
Why do you want/need it?

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P.E. Metallurgy

 

[ElCidCampeador]

If you can't find it then you probably don't have it.
Why do you want/need it?

It's for an annoying pressure vessel that I'm building :/

 

It's for an annoying pressure vessel that I'm building :/

Translation: it's for a really bad technical specification ordered by an ignorant client.

Am I right?

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[weldstan]

Your chances of finding A-106B vacuum degassed are slim and next to none. You may have a better chance with A-333 6. Ask your potential steel makers.

 

[Dhurjati Sen]

Dear ElCidCampeador,

Find out inclusion content of the steel. ASTM E45 - 18a would come handy.

Then compare the result with standard inclusion charts to determine if the steel was vacuum degasssed.

Regards.

DHURJATI SEN
Kolkata, India