Hardness on NACE Material
pradip kumar sil
We are going to fabricate carbon steel to carbon steel pipe ( A-106 To
A 106 Gr. B/ A-105/ A234 GR. B ) with NACE Specification as per MR-175
without POST WELD HEAT TREATMENT.
In this case how much is maximum limit of hardness in BASE METAL/HAZ &
WELD MENT & where it is specified.
Can we use normal ER-70S2 filler wire & E-7018 Electrode ( Without
HICC & SSIC Certificate )
Regards
Pradip
mubeen mubeen
Pradip
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pgoswami
Dear Pradip,
Is the service is for upstream (offshore oil and gas) or downstream (oil and gas refining) environments.
If the service is for upstream environments then MR-0175-ISO-15156-2 requirements as stated below will be applicable. Refer Annex-A of MR-0175 for this.
Welding consumables and procedures that produce a deposit containing more than 1 % mass fraction nickel are acceptable after successful weld SSC qualification by testing in accordance with Annex B. ER-70S-2 and E-7018 will not have problem with respect to this issue. However advise would be to get the " Confirmation from the consumable manufacturer", as welding consumables meet requirements of MR-0175/ISO-15156.
Thanks.
Pradip
Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,
Canada.
Email-p...@sympatico.ca,
pgos...@quickclic.net
Maximum acceptable hardness values for carbon steel, carbon-manganese steel and low-alloy steel welds
