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Low Temp. Carbon Steel & Low Temp. Stainless Steel

Low Temp. Carbon Steel & Low Temp. Stainless Steel

Low Temp. Carbon Steel & Low Temp. Stainless Steel

(OP)
This might be a silly question...

I am aware of normal temp (min temp. = -29 deg C) vs. low temp (min temp. = -45 deg C) CARBON steel pipe and fittings, but is there a similar relationship between different types of stainless steels?

From what I see in table A-1 in B31.3, most stainless steels such as ASTM A182 & A312 can be used as low temp piping (i.e. at -45 deg C). What stainless steel piping and fittings can not be used for low temp. piping applications? (if there are any).

Thanks in advance!

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

The issue with "low temperature" materials is adequately capturing the ductile-to-brittle transition. This is a property of all ferritic steels, such as carbon steel. Most stainless steels are austenitic and do not exhibit such a transition to brittle behaviour.

Not a silly question. Good question.

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

Duplex stainless steels, ferritic stainless steels and martensitic stainless steels undergo a ductile to brittle transition as temperature decreases. All body centered cubic structured metals and alloys will undergo this transition.

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

(OP)
Thank you TGS4.

Weldstan, which stainless steels are you referring to? Does A182 & A312 fall into this?

Thanks.

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

Both ASTM spec have numerous grades. The 3XX series are austenitic (face centered cubic). The 4XX series are ferritic or martensitic (body centered cubic/body centered tetragonal). Duplex stainless alloys have a mixed ferritic and austenitic structure (approximately 50/50.

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

(OP)
Thank you Weldstan!

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

Is there any difference between carbon steel and killed carbon steel welding procedure?
Thanks.

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

ASME B31T 2015 This Standard provides requirements for evaluating the suitability of materials used in piping systems for piping that may be subject to brittle failure due to low-temperature service conditions

RE: Low Temp. Carbon Steel & Low Temp. Stainless Steel

In terms of qualification, no. However if you are qualifying a procedure requiring impact testing to be performed at low temperature, you will need to qualify your WPS with killed carbon steel made with fine grain melting practice.

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