At OGC Energy we help the energy industry with finding answers to some of their most difficult questions. We have created this section hoping that you will find answers to some of the most common questions in the following areas:

  • Corrosion in offshore industry
  • Downhole corrosion
  • Materials Selection
  • ANSI/NACE MR0175 / ISO 15156
  • H₂S

If you require technical support in metallurgy, corrosion, or welding; or if you need assistance meeting the requirements of ANSI/NACE MR0175/ISO 15156 then contact our team, we are here to help you.

  • 191.

    NACE MR0175 and the requirements for HSC, GHSC and SSC

    Galvanic Corrosion NACE: Understanding HSC and GHSC The inquiry concerns HSC, which describes hydrogen embrittlement in metals that are not sensitive to SSC but can be embrittled when galvanically coupled with another metal that is actively corroding. The term “”galvanically induced HSC”” is used to describe the mechanism for this cracking. However, in NACE MR0175-1 […]

    Read more
  • 192.

    is 3D printing considered within the scope of NACE MR0175 / ISO 15156?

    Is 3D Printing Considered a Manufacturing Process Within the Scope of NACE MR0175 / ISO 15156? The inquiry asks if metal additive manufacturing, also known as 3D printing, is considered a manufacturing process within the scope of NACE MR0175 / ISO 15156. If not, the inquiry wonders if a material or alloy listed as acceptable […]

    Read more
  • 193.

    NACE MR0175 and cold work of 316L and other austenitic stainless steels.

    NACE Stainless Steels Inquiry The inquiry refers to NACE MR0175 / ISO 15156-3 (2015) and seeks clarification on a comment in the notes section of Table A.2 applicable to UNS S31603. Clarification on Limits for UNS S31603 The note states that after the final solution annealing and quenching treatment, hardness and cold work incidental to […]

    Read more
  • 194.

    Maximum Hardness for AISI 4130 Q&T (>140 ksi) in NACE MR0175 Table A.3?

    Is There a Maximum Hardness Limit for AISI 4130 Q&T? Introduction Inquiry asks if there is a maximum hardness limit for AISI 4130 Q&T with a yield of 140 ksi for temperatures above 80°C in Table A.3. This inquiry pertains to NACE MR0175/ISO 15156-2 A., Table A.2, and Table A.3. Reference is made to ISO […]

    Read more
  • 195.

    What are the NACE MR0175 hardness requirements for a buttweld with inner CRA cladding?

    CRA Cladding NACE: Applicability to Carbon Steel HAZ of Clad Pipe’s CRA Girth Weld Overview The inquiry seeks to clarify if NACE MR0175/ISO 15156-2 section A.2.1.5 and Table A.1, as well as section A.13.1 in NACE MR0175/ISO 15156-3, are applicable to the carbon steel HAZ of a clad pipe’s CRA girth weld, except for the […]

    Read more
  • 196.

    Which NACE MR0175 table applies to 718 (regardless of heat treated condition)?

    Is UNS N07718 a Solid-Solution Alloy? The inquiry questions whether a nickel alloy without any age/precipitation-hardening heat treatment should be categorized as a solid-solution alloy and, therefore, covered by Tables A.12 to A.16 in the NACE standard. The response discusses the heading of Tables A.31 to A.34 pertaining to precipitation-hardened Nickel-based alloys. While the heading […]

    Read more
  • 197.

    Is there anything preventing someone from averaging HRV values right now?

    Averaging HV Values in NACE MR0175/ISO 15156 The inquiry questions whether averaging HV values is allowed when using the HV5, HV10, or HRC 15N scales in NACE MR0175/ISO 15156, as the document is silent on this issue. The ASTM E140 conversion chart shows that there is a 16HV difference that equates to 2 HRC, or […]

    Read more
  • 198.

    Is HIC a potential risk if the partial pressure of H₂S is below 0,3 kPa?

    HIC NACE and SWC Risks in Sour Service Introduction The inquiry pertains to HIC and SWC risks mentioned in Clause 7.1.2/Note 3 of NACE MR0175/ISO 15156-2 with reference to Clause 8. Clause 8 states that HIC may be a potential risk in sour service even if only trace amounts of H₂S are present. Clarification on […]

    Read more
  • 199.

    NACE MR0175 and the evaluation and acceptance criteria for the Four Point Bend (FPB) test

    Clarification on Clause NACE MR0175/ISO 15156-2 B.4.2.3 This inquiry pertains to the clause NACE MR0175/ISO 15156-2 B.4.2.3 that outlines evaluation and acceptance criteria for FPB test specimens. Two questions are presented for clarification: 1. Reporting Blister Depth The clause states that blisters less than 1mm below the surface on the tensile side or any depth […]

    Read more
  • 200.

    In NACE MR0175, is UNS S41425 sulfur resistant in Table A.18?

    S41425 NACE Material Grade: Confirmation of Correctness Introduction If you’re using martensitic stainless steels for any equipment or components, you need to be aware of the sulfur resistance of the material grade S41425. This inquiry seeks to confirm the correctness of the designation “”No”” for material grade S41425 listed as not being sulfur resistant in […]

    Read more

Let’s talk about your next project