Q345 Steel Grade
Q345 is a steel material. It is low-carbon steel (c <0.2%), good overall performance, good low temperature performance, the performance of cold
stamping, welding performance and good cutting. Widely used in bridges, vehicles, ships, construction, pressure
vessels. Q represents the yield of this material, behind the 345, the yield refers to the value of this material
around the 345MPa. And will increase the thickness of the material and its yield value decreases. Any inquiry,
advise Jawaysteel freely.
1) by the Q + digital + quality rating symbols + decoy method symbols. Its steel dubbed "Q", the representative
of the yield point of steel, behind the numbers indicate the yield point value, the unit is MPa yield point such as
Q235 (σs) of 235 MPa of carbon structural steel.
2) when necessary, can be marked symbols representing steel quality level and deoxygenating methods. Quality
rating symbols are A, B, C, D, E. Decoy method symbols: F indicates boiling steel; b represents a half-killed steel: Z represents killed steel; TZ represents special killed steel, killed steel may mark symbol, namely Z and
TZ can not marked. For example Q235-AF represents A-level boiling steel.
3) special purpose of carbon steel, such as steel bridges, marine steel, basically representation carbon structural
steel, but steel represents the last additional use letters.
1)Chemical composition
Grade |
C |
Si |
Mn |
P |
S |
V |
Nb |
Al |
Ti |
Q345A |
0.2 |
≤0.55 |
≤1.70 |
≤0.045 |
≤0.045 |
0.02-0.15 |
0.015-0.060 |
- |
0.02-0.20 |
Q345B |
≤0.20 |
≤0.55 |
≤1.70 |
≤0.040 |
0.04 |
0.02-0.15 |
0.015-0.060 |
- |
0.02-0.20 |
Q345C |
≤0.20 |
≤0.55 |
≤1.70 |
≤0.035 |
≤0.035 |
0.02-0.15 |
0.015-0.060 |
≥0.015 |
0.02-0.20 |
Q345D |
0.18 |
≤0.55 |
≤1.80 |
≤0.030 |
≤0.030 |
0.02-0.15 |
0.015-0.060 |
≥0.015 |
0.02-0.20 |
Q345E |
≤0.18 |
≤0.55 |
≤1.80 |
≤0.025 |
≤0.025 |
0.02-0.15 |
0.015-0.060 |
≥0.015 |
0.02-0.20 |
2)physical composition
Yield strength: ≤16mm: more than 345,16-40mm: more than 335,40-63mm: more than 325,63-80mm: more than 315,
80-100m: more than 305,100-150mm: more than 285,150-200mm: more than 275.
Tensile strength: 450-630.
Elongation: more than 17.
Impact test: Test temperature: 20 ℃: more than 34.
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