Q420B, Q420C, Q420D and Q420E angle steel is a different grade of the same material Q420, its chemical composition and mechanical properties are basically the same, but there are some minor differences.
Q420B angle steel yield strength is Greater than or equal to 420MPa, tensile strength is Greater than or equal to 520MPa, impact toughness is Greater than or equal to 34J;
Q420C angle steel yield strength of Greater than or equal to 420MPa, tensile strength of Greater than or equal to 520MPa, impact toughness of Greater than or equal to 34J;
Q420D angle steel yield strength of Greater than or equal to 420MPa, tensile strength of Greater than or equal to 520MPa, impact toughness of Greater than or equal to 27J;
Q420E angle steel yield strength of Greater than or equal to 420MPa, tensile strength of Greater than or equal to 520MPa, impact toughness of Greater than or equal to 27J.
Therefore, the mechanical properties of Q420B and Q420C angles are slightly higher than Q420D and Q420E angles, but the impact toughness of Q420D and Q420E angles is slightly higher than that of Q420B and Q420C angles.
