Advantages and properties of Q390GJD-Z25 steel plate

Advantages and disadvantages of Q390GJD-Z25 steel plate:
Q390GJD-Z25 steel plate has the following advantages
(1) High strength and large ratio of strength to weight; Good plasticity and toughness;
(2) Uniform material, consistent with mechanical assumptions, high safety and reliability;
(3) Factory production, high degree of industrialization and fast construction speed.

Disadvantages of Q390GJD-Z25 steel plate: steel structure is heat resistant and not fire resistant; Easy to rust and poor corrosion resistance.
Executive standard of Q390GJD-Z25 steel plate: GB/T19879

Chemical composition and melting analysis of Q390GJD-Z25 steel plate:
1) The carbon content in Q390GJD-Z25 steel plate is less than or equal to 0.18%;
2) The silicon content of Q390GJD-Z25 steel plate is less than or equal to 0.55%;
3) The manganese content of Q390GJD-Z25 steel plate is less than or equal to 1.60%;
4) The sulfur content of Q390GJD-Z25 steel plate is less than or equal to 0.015%;
5) The phosphorus content of Q390GJD-Z25 steel plate is less than or equal to 0.020%;
6) The vanadium content of Q390GJD-Z25 steel plate ranges from 0.020 to 0.200;
7) The proportion of niobium content in Q390GJD-Z25 steel plate is 0.015-0.060;

Mechanical properties of Q390GJD-Z25 steel plate:
1) The yield strength of Q390GJD-Z25 steel plate should reach 390MPa (MPa) or more;
2) The tensile strength of Q390GJD-Z25 steel plate should reach 490-650MPa (MPa);
3) The elongation of Q390GJD-Z25 steel plate shall be greater than or equal to 20%;
4) The V-shaped impact energy of Q390GJD-Z25 steel plate shall be greater than or equal to 34J (J);

Delivery status (heat treatment) of Q390GJD-Z25 steel plate:
The delivery method of Q390GJD-Z25 steel plate has many kinds of heat treatment processes, which can be normalized or hot-rolled. At the same time, the sulfur and phosphorus content of steel plate with thickness direction performance requirements shall comply with the provisions of GB/T5313.