Carbon steel pipe
product types: seamless and welded
standard: gb /astm / asme / din / jis / api
material: astm a53-a, a53-b, a106-a, a106-b, a106-c, ck45; astm 519-03 gb/t 8162: 10, 20, 35, 45, q235, q345(16mn), 40cr; gb/t 8163; gb /t3087-1999; ...
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