... Iron & Steel Co., Ltd ,which is a trading company based on the goods of International and Domestic.steel ... ), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size Inspection, Nondestructive Test (Ultrasonic flaw detector, ... Test. Seamless steel pipe: ASTM A 53 specification for black steel seamless pipes ASTM A 106 Gr. B ...