... , Welded and Seamless2. GB/T8162 Seamless Steel Tubes for Structural Purposes3. JIS G3441 Alloy steel tubes for machine purposes4. JIS G3444 Carbon steel ... Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength,Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow ...