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ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

(OP)
thread330-301517: Nickel content limit from NACE0175?

My specific enquiry is in the header. Am I correct in thinking the limit of 0.5% Nickel carries on the tradition started by NACE MR0175?

What is the current state of the science (or opinion) with respect to Nickel-bearing low alloy steels in sulphide and hydrogen service?

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

Regarding the limit, I would mostly concur with the statements in posted thread 330-301517.

RE: ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

(OP)
metengr,

There's a lot to untangle in that thread!
Bottom line is, do you think the restriction is technically justified?

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

No.

RE: ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

Hi all,
I have an additional question.

Why is nickel content in GX120CrMo34-2 limited to 0,5%. Is it only for price stability reasons or there is some other reason?
This alloy is also known as GL 21 from Klaus Kuhn and similar alloy is GX120CrMo29-2 (1.4138 steel).

Thanks guys.

RE: ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel

(OP)
Thanks metengr, an excellent article.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

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