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Oct 29,2018 gb t q275a h section steel mechanical properties Q235 Steel Plate Equivalent Steel Standard ASTM A36 If only compare the mechanical properties of these grades,it is found that the mechanical properties of A36 and high quality carbon structural steel 20# are quite similar to Ss400,A36,S235jr,S355jr,Q235,Q345 Density Of Carbon Steelgb t q345c heb beams mill