Q390GJD-Z25 steel plate technical data sheet

What is the technical standard of Q390GJD-Z25 steel plate?
In the description of steel plate grade, it is said that Q390GJD-Z25 steel plate is structural steel plate for high-rise buildings, which is implemented according to the standard GB/T 19879 for structural steel plate for high-rise buildings. The Chinese standard GB/T 19879 specifies the executive standard, chemical composition, mechanical properties and other requirements of Q390GJD-Z25 steel plate.

Thickness deviation of Q390GJD-Z25 steel plate:
The appearance, size, thickness, specification and allowable deviation of Q390GJD-Z25 steel plate shall comply with the national standard GB/T 709, and the thickness deviation shall be - 0.3 mm of the fixed deviation specified in the standard.

Chemical composition analysis of Q390GJD-Z25 steel plate:
6-100 mm thickness:
Q390GJD-Z25 steel plate → C (carbon) → ≤ 0.20;
Q390GJD-Z25 steel plate → Si (silicon) → ≤ 0.55;
Q390GJD-Z25 steel plate → Mn (manganese) → ≤ 1.60;
Q390GJD-Z25 steel plate → P (phosphorus) → ≤ 0.025;
Q390GJD-Z25 steel plate → S (sulfur) → ≤ 0.015;
Q390GJD-Z25 steel plate → V (vanadium) → 0.020-0.200;
Q390GJD-Z25 steel plate → Nb (niobium) → ≤ 0.016-0.060;
Q390GJD-Z25 steel plate → Ti (titanium) → ≤ 0.010-0.030;
Q390GJD-Z25 steel plate → Cr (chromium) → ≤ 0.40;
Q390GJD-Z25 steel plate → Cu (copper) → ≤ 0.30;
Q390GJD-Z25 steel plate → Ni (nickel) → ≤ 0.70;

The allowable deviation of chemical composition of finished Q390GJD-Z25 steel plate shall comply with the provisions of GB/T 222, and can be analyzed by spectrograph.

Detailed explanation of mechanical properties of Q390GJD-Z25 steel plate:
Q390GJD-Z25 steel plate → yield strength → ≥ 390MPa;
Q390GJD-Z25 steel plate → yield strength → 490-650MPa;
Q390GJD-Z25 steel plate → elongation → ≥ 22%;
Q390GJD-Z25 steel plate → impact energy → ≥ 34J;
Q390GJD-Z25 steel plate → 180°bending test → ≥ d=3a;
Q390GJD-Z25 steel plate → yield ratio → ≤ 0.85;

Q390GJD-Z25 steel plate area reduction test:
The average value of the reduction of area of Q390GJD-Z25 steel plate in three tests is ≥ 25, the average value of single test is ≥ 15, and the average value of impact energy is calculated according to a group of three samples.