In GB/T 1591 Q390C hot rolled HSLA steel plates, the steel grade Q390C is composed of three parts, namely, the Chinese phonetic alphabet, the yield strength value and the quality grade symbol, which represent the yield strength, for example, Q represents the steel yield strength "Qu" Chinese phonetic alphabet first letter; 390 is yield strength value, unit MPa; C is quality grade, which is classified into grades B/C/ D/E.
When needs the thickness direction property of theGB/T 1591 Q390C hot rolled HSLA steel plates, the symbol of the performance level representing the thickness direction (Z direction) is added after the Q390C grade.
GB/T 1591 Q390C hot rolled HSLA steel plates chemical composition:
|
Grade |
C % |
Si % |
Mn |
P % |
S % |
|
Q390C |
≤ 0.20 |
≤ 0.55 |
1.00-1.60 |
≤ 0.035 |
≤ 0.035 |
GB/T 1591 Q390C hot rolled HSLA steel plates mechanical property:
|
Grade |
Thickness |
Yield Strength (Mpa) |
Tensile Strength |
Elongation(%) |
Impact Energy |
|
|
(mm) |
(MPa) |
Min |
||||
|
Q390C |
≤16 |
390 |
490-650 |
20 |
0 |
34 |
|
|
>16-35 |
370 |
490-650 |
20 |
0 |
34 |
|
|
>35 |
350 |
490-650 |
20 |
0 |
34 |
|
The min impact energy is longitudinal energy |
||||||
GB/T 1591 Q390C hot rolled HSLA steel plates enjoy good comprehensive mechanical properties, good welding performance, cold and hot processing performance and corrosion resistance, as well as good low temperature toughness. Q390C steel plates are mainly used in ships, boilers, pressure vessels, oil storage tanks, bridges, power station equipment, lifting and transportation machinery and other welded structures with higher loads.
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