ASME B31.12 Hydrogen Piping -- Reason for 0.5% Nickel Limit in Steel 1

[Guest102023]

thread330-301517

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?"

 

[metengr]

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

 

[Guest102023]

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?"

 

[metengr]

No.

 

[metengr]

http://www.degruyter.com/dg/viewart...2fcorrrev-2014-0027$002fcorrrev-2014-0027.xml

 

[Martinos]

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.

 

[Guest102023]

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?"

 

[SJones]

@Brimstoner

This corrects the mistakes:

http://www.degruyter.com/view/j/cor...ev-2014-0058/corrrev-2014-0058.xml?format=INT

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

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