... structure, mechanical structure with seamless steel tubes. Standard GB/T8162 , GB/T8163 ,ASTM A53 ,ASTM ... Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size Inspection, Nondestructive Test (Ultrasonic flaw detector ... SM400A, SM400B, SM490A, SM490B, SM520B, SM520C 2. Standard: JIS 3. Product: Welding strcutural steel plate 4. ...