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SA 105 HIC

SA 105 HIC

SA 105 HIC

(OP)
Is the strength of SA 105 HIC different from SA 105 N?

RE: SA 105 HIC

Well, did you look up SA-105 HIC up in section II?

Did you find it?  Didn't think so.

HIC is a generic term used for the treatment of steel during it's manufacturing process to prevent Hydrogen Induced Cracking.

I wasn't aware of any forging companies that were doing this process.

RE: SA 105 HIC

(OP)
Thanks for reply, Vesselfab.

Yes, HIC requires chemstry control for material. Does SA105 HIC still need to be normalized? Since the Carbon content is reduced or controlled to 0.23%, is its strength the same as SA105N?
 

RE: SA 105 HIC

It still has to meet SA 105 minimum yield strength requirements, otherwise it won't be SA 105!!!  If you are going for HIC, then ISO 15156-2 would require normalising, at least, for a forging (unless somebody wants to apply 'hot rolled' as a heat treatment term for a forging).

Steve Jones
Materials & Corrosion Engineer
http://www.oilandgaspeople.com/cv/11499664
http://www.linkedin.com/pub/8/83b/b04
 

RE: SA 105 HIC

The forging will be marked SA-105N and will meet all the chemical and physical requirements of SA-105.

If you are indeed getting HIC certified material, you should also spec out the NACE testing requirements on your order.

 

RE: SA 105 HIC

You are not going to readily find a SA-105-N HIC forging.  What we normally use for vessels with HIC requirements is to use SA-350-LF2 Cls. 1 forgings instead.  This is a low temp qualified forging with near identical chemistry to SA-105-N, but the chemistry control and testing is more suited for HIC service.  For pipe, I suggest SA-333 Grd. 6 Smls.

RE: SA 105 HIC

The chemistry is the important factor, but also important is the manufacturing method and the final heat treatment of material. I would suggest you to read carefully the whole NACE MR0175 and NACE MR0103, so you'll have a documented opinion.
In addition to your topic, take note of the NACE MR0175, Clause 8 (Evaluation of carbon and low alloy steels for their resistance to HIC/SWC), this will help you understand the selection and testing requirements for the forging materials to prevent the HIC.
Cheers,
gr2vessels

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