What do these labels mean?
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What do these letters and numbers mean: 20# GB/T699 SW SH3410 SCH80?
20# refers to carbon steel grade 20; GB/T699 is the standard specification for high-quality carbon steel; SW denotes socket weld; SH3410 is a petrochemical industry standard specification; SCH80 represents a pipe wall thickness series of 80
20# refers to carbon steel grade 20, and GB/T699 is the **standard for promotion and use. SW refers to socket weld flanges; SH3410 is a petrochemical standard specification; SCH80 is an American standard for pipes, with a diameter of 80
20#: It refers to carbon steel grade 20. GB/T699: It is the standard that is promoted for use. SW: It refers to a socket weld flange. SH3410: It is a standard specified in the petrochemical industry. SCH80: It is an American standard for pipes; a diameter of 80 corresponds to DN80.
Agree with the comment above; it is a description of the pipeline grade. You can check the pipeline grade specification table.
Tips: SCH80 does not refer to the pipe diameter