What are the requirements specified in NaCe ISO MR 0175 regarding the sulfide and phosphorus content in the raw materials?
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Regarding flanges and fittings with low sulfur and phosphorus content, many of the quotes currently refer to NACE ISO MR0175 as the standard. I don’t have enough knowledge to understand this standard; what are the specific sulfur and phosphorus content limits for HIC and H2S? There are also manufacturers in the market who dare to do this, but we have never dared to get involved in this area. Could someone please explain it to us? Thank you!
Reference can be made to 7.8 in HG/T20581
There is a specific chapter within it that specifies the sulfur and phosphorus content limits for carbon steel and low-alloy steel. I don’t have the book with me right now, so I can’t check it
I checked online; S<0.003%, P<0.010%, Ni<0.10%. I’m not sure if this is correct – the standard for pipes is GB/T9948
Correction: Ni < 1.0%
Personally, I think that no matter what the concentration is, as long as the material used meets the requirements, it’s fine.
In other words, it means stricter requirements for the content of antimony and phosphorus in the material
There’s nothing special about it; basically, all valve manufacturers can meet the standard requirements~~~
However, some major clients require that the materials undergo SCC, HIC, and third-party testing; you can turn to Zhejiang Xinhai Testing for this, and Zhenghuo will provide you with a solution along with the third-party report