Please help, experts – what does the marking A150 on this flange mean?
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What is ASTM A150? Is it a type of material?
ASTM A150 is a standard specification established by the American Society for Testing and Materials (ASTM). It is a standard specification for castings, which specifies the standard requirements for cast iron flanges, including dimensions, pressure ratings, chemical composition, mechanical properties, and surface treatment requirements. Therefore, A150 does not represent a specific material, but rather a standard specification used to guide the production and use of cast iron flanges. .
It refers to carbon steel flanges of the American standard series
Intuitively, it seems there’s a mistake in the stamping; it should be ASTM A105 rather than A150； ASTM 150 is a standard from 1936, and it is not covered in ASME B31.3 for process piping.
Refer to Standard Specification \"Selection and Engineering Application of Pipeline Fittings\", page 434; \"Process Piping Installation Design Manual: Pipeline Fittings\", page 321. SH 3059: ASTM 105 refers to forged carbon steel, which corresponds to GB12228 in China.
Thanks to my brothers for sharing: handshake
Judging from the photos, the flange does not seem to be cast. It should be forged from carbon steel. It seems that A105 was mistakenly written as A150.
The grade was entered incorrectly; it should be A105
This post was last edited by feng*aosa on 2023-9-16 at 16:25. A105 and WCB are made of the same material; both fall under the material category 1.1 of ANSI B16.34 (carbon steel). The difference is that A105 is forged while WCB is cast. A105 is a carbon steel forging. The same material, when formed by casting, is A216 or WCB. (After molding, differences will arise due to the varying molding methods. ).
ASTM series carbon steel flanges, forged