FAQ's

Is 243 Brinell acceptable for carbon steels in accordance with NACE MR0175 / ISO15156-2 Table A.1?

Can a Part with a Welded and Post-Weld Heat Treated Surface be Accepted According to NACE MR0175/ISO 15156-2 Table A.1 with a Measured Hardness of 243 Brinell?

If you’re wondering whether a part with a welded and post-weld heat treated surface can be accepted according to Table A.1 of NACE MR0175/ISO 15156-2, given a measured hardness of 243 Brinell, this page has the answer.

The questioner’s engineering department considered the hardness acceptable according to Section A.2.1.4, which states that acceptable maximum hardness values are given in Table A.1. However, an independent organization, Lloyds Register, pointed out that Table A.1 refers to hardness test locations for welding procedure qualification, using different hardness techniques.

So, what’s the right way to measure hardness? Hardness measurements must be performed according to § 7.3.3, using Vickers hardness HV 10 or 5 or Rockwell 15N methods, as the Brinell hardness method is subject to equipment user acceptance.

Table A.1 applies to both qualification and production hardness values, although a measured hardness of 243 Brinell requires the equipment user’s acceptance and compliance with two other listed requirements in Table A.1.

If you need more information on this topic, you can refer to ISO 15156 Maintenance Panel Inquiry #2011-05.

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