Q345B is low alloy structural steel with good mechanical properties, low temperature performance, plasticity and good weldability.
Q345B steel is a Chinese standardized low alloy, medium tensile strength steel made with a hot-rolling process, and is used for a number of manufacturing purposes.
Main chemical elements composition of GB/T1591 Q345B low alloy structural steel:
| Main chemical elements composition of Q345B | |||||||
| C | Si | Mn | P | S | V | Nb | Ti |
| 0.20 | 0.55 | 1.00-1.60 | 0.040 | 0.040 | 0.02-0.15 | 0.015-0.060 | 0.02-0.20 |
GB/T1591 Q345B low alloy structural steel Mechanical Property:
| Thickness (mm) | ||||
| Q345B | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 345 | 325 | 295 | 275 |
| Tensile strength (Mpa) | 470-630 | |||
GB/T1591 Q345B low alloy structural steel application:
Q345B low alloy steel is widely used as welding structural part in manufacturing of ship, railway and vehicles, bridges, boiler, pressure vessel container, steel oil tank, etc.
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