Q550D representation method: "Q" as the first letter of the Chinese character Pinyin of the yield strength of steel; "550" as the yield strength value, in MPa; D-quality grade is D grade (quality grade is divided into C, D , E).
Q550D When the customer needs to have the thickness direction performance of the steel plate, add the symbol representing the thickness direction (Z-direction) performance level after the above-mentioned specified grade, for example: Q550D-Z15, Q550D-Z25, Q550D-Z35.
Q550D steel standards: GB/T 16270-2009; GB/T1591-2018
►Mechnical property for GB/T 16270 Q550D steel plate:
|
Thickness(mm) |
Yield strength (≥Mpa) |
Tensile strength (Mpa) |
Elongation in ≥, A % |
|
T≤50 |
550 |
640-820 |
16 |
|
50<T≤100 |
530 |
640-820 |
|
|
100<T |
490 |
590-770 |
►Chemical composition for GB/T 16270 Q550D steel plate (Heat Analysis Max%)
|
Main chemical elements composition of GB/T 16270 Q550D steel plate |
||||||
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
|
0.20 |
0.80 |
1.70 |
0.025 |
0.015 |
0.50 |
1.50 |
|
Ni |
Mo |
B |
V |
Nb |
Ti |
- |
|
2.00 |
0.70 |
0.005 |
0.12 |
0.06 |
0.05 |
- |
Q550D steel smelting method: steel is smelted by converter or electric furnace, and refined outside the furnace if necessary.
Q550D delivery status: Q550D steel plate is usually delivered in quenched and tempered condition.
Q550D steel plate main application: mainly used in important (low temperature) high-strength structural parts, engineering machinery, mining steel structural parts.
