The implementation standard of Q420 steel plate is GB1591-2008.
The quality grade of Q420 steel is divided into Q420A steel, Q420B steel, Q420C steel, Q420D steel and Q420E steel.
Q420A steel grade is not required for impact toughness test;
Q420B steel grade is used for impact toughness test at room temperature (20°C);
420C steel grade is for 0℃ impact toughness test;
Q420D steel grade is used for impact toughness test at -20°C;
Q420E steel grade is for impact toughness test at -40°C. The impact toughness test uses a Charpy V-notch specimen.
Due to the addition of microalloying elements, Q420 steel plate has high strength and good fatigue resistance; Q420 steel plate has high toughness and low brittle transition temperature; Q420 steel plate has good cold forming performance and welding performance; Q420 steel plate has better Excellent corrosion resistance and certain wear resistance. Especially in the state of normalizing or normalizing plus tempering, Q420 steel plate has high comprehensive mechanical properties.
