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ASTM A105 VS A234 or A350 VS A420
- tigertrung
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I am studying piping material. They are separated to group.
Example:
Pipe: ASTM A53 GR.B
Fitting: <2" : ASTM A105
>=2": ASTM A234 GR.WPB
or Pipe: ASTM A333 GR.6
Fitting: <2": ASTM A350 LF2
>=2": ASTM A420 WPL6
Although I read the standard, but I don't understand when do we choose A105 or A234 as well as A350 or A420
Should you make me clearly this subject ?
Thank you very much.
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- 11echo
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...When I work on the Alaskan Pipeline, I used all these quite offen! Good Luck!
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- tigertrung
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Thank you for your response
A105 is forged carbon steel & A234 is wrought carbon steel, not casting. I see the mechanical properties of A105 isn't too difference with A234.
Tensile Strength Yield(KSI)
A234 WPB 60-85 35
A105 70 36
So, why do we use A105 for smaller SW fittings, but not A234 ?
Well I see two issues here ...A105 & A350 are forged steels, so for smaller threaded or socket welded fittings. A234 & A420 are cast steels used on larger fitting (casting is MUCH cheaper process then forging!) ...The other issue I see is usage A105 & A234 is a regular usage steel ...normally down to -20 Deg.s F ...A350 & A420 is a cold temp steel, used where temp.s go below the -20 mark. Same thing on the pipe steels A53-B is regular usage, A333-6 is used in cold application.
...When I work on the Alaskan Pipeline, I used all these quite offen! Good Luck!
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- 11echo
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To answer your last question, A105 steel is a hammer forged steel … (causing the molecules in the steel to be closer together, because of the hammer forged process) …producing very strong steel, and any fittings or flanges fabricated from these forged billets. However this forging process is an expensive process, so trying to fabricate "big expensive" fittings is counter productive, when cheaper A234 (non-forged steel) is available and can do the job ...bottomline it's just an economy factor.
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- tigertrung
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Thank you for your consultancy.
Where are you from ?
Have a nice day.
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