GB/T 16270-2009 Q690C High strength structural steel plates in the quenched and tempered condition. Q690 belongs to degree welded structural steel. Among them, Q represents the yield strength, 690 represents the yield strength value, and D represents the grade of the steel plate; the common steel plate quality grades are C, D, and E, F respectively. The impact of grade steel plate is -20°C. Q690D plates can be called a low temperature resistant steel with a yield strength of 690Mpa. Q690D steel plate has higher yield strength and tensile strength.
Q690 high strength steel Q690C Q690D Q690E chemical composition(%)
Quality Grade |
C |
Si |
Mn |
P |
S |
Nb |
V |
Ti |
Cr |
Ni |
Cu |
N |
Mo |
B |
Al |
|
Q690C |
≤ 0.18 |
≤ 0.60 |
≤ 2.00 |
≤0.030 |
≤0.030 |
≤ 0.11 |
≤ 0.12 |
≤ 0.20 |
≤ 1.00 |
≤ 0.80 |
≤ 0.80 |
≤ 0.015 |
≤ 0.30 |
≤ 0.004 |
≥ 0.015 |
|
Q690D |
≤0.030 |
≤0.025 |
|
Q690E |
≤0.025 |
≤0.020 |
Mechanical Property
|
|
|
Q690 Yield Strength (≥N/mm2); Thickness or Dia. d (mm) |
|
|
Standard |
Steel Grade |
Quality |
d≤16 |
16<d≤40 |
40<d≤63 |
63<d≤80 |
|
GB/T 16270 |
Q690 |
C, D, E |
690 |
670 |
660 |
640 |
Q690C Q690D Q690E plates have high yield strength and tensile strength and is widely used in coal mine machinery and engineering machinery, such as hydraulic support, port cranes, flatbed trucks and so on.
Uses: Q690 high strength steel is widely used in coal mine machinery and engineering machinery, such as hydraulic supports, port cranes, and flatbed trucks.
