GB/T 699 30# carbon steel is a low carbon steel at chinese standard. GB/T 699 30# carbon steel, usually needs to do normalizing treatment, or quenching and tempering treatment, to get good properties and machinability. For GB/T 699 30# carbon steel,w
GB/T1591 Q345 C/D I/H Beam /channel steel is a kind of steel material. GB/T1591 Q345 C/D I/H Beam /channel steel is a low carbon alloy steel (c
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