Stainless Steel A554 Gr 409/409L Square Hollow Sections. SS Square Hollow Section Specification. Specifications ASTM A554 / ASME SA554. Sizes 20*20mm-400*400mm. Wall Thickness 0.5mm Steel Pipe - Seamless Steel Pipe Welded steel pipe stainless steel welded hollow tubeSteel pipe is the long, cylindrical hollow metal pipe that is used for a variety of purposes which can be classified into seamless pipe and welded pipe by their forming method. Metal pipe is widely used to transport flowing medium like oil, gas, or water over long distance, or in common household appliances and structural requirements like hand rails and pipe bollards, it is also applied in a stainless steel welded hollow tube
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