SS 316L ASTM A249 Welded Tube / ASTM A 312 in 304/304L SS 316L ASTM A249 Welded Tube Specification. Aesteiron Steels leading SS 316L ASTM A249 Welded Tube manufacturers, founded in 1998. We pride ourselves on being at the forefront of innovation in both product lines and after sales services.
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