ASTM A131 DH40 Steel machining parts is mainly used in shipbuilding like deck, offshore etc. ASTM A131 DH40 Steel machining parts Surface: Clean, Shot blasting and painting according to customer requirement.
ASTM A53 Grade A Welded and Seamless steel pipe uses cold rolling, hot / cold drawing, hot drawing process, ASTM A53 Grade A steel pipes have the surface of the black paint, anti-corrosion oil, galvanized or customer requirements.
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