ASTM A105是材质的标准 N表示正火的意思 （FORGED-锻造的意思）
应该是 A105M吧 Standard Specification for Carbon Steel Forgings for Piping Applications
This specification2 covers forged carbon steel piping
components for ambient- and higher-temperature service in
pressure systems. Included are flanges, fittings, valves, and
similar parts ordered either to dimensions specified by the
purchaser or to dimensional standards such as the ASME and
API specifications referenced in Section 2.
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