| http://www.w3.org/ns/prov#value | - hebei hengtong steel pipe co.,ltd China(CN) ... , such as GB, ASTM, api 5l, api 5CT, DIN and JIS.We can produce various low-pressure, medium-pressure and high-pressure industrial pipe fittings that are made of carbon steel, alloy steel and stainless steel, such as elbows, flanges, tees, pipe caps, ...
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