1. Overview of Q345 steel plate and Q355 steel plate
Q345 steel plate is a low-Alloy steel plate, which can be divided into five grades: A, B, C, D, and E. Q345A is not subject to low-temperature impact test, and Q345B, Q345C, Q345D, and Q345E are subject to impact test. The temperature is 20˚C and 0˚C respectively. Q345 steel plate executive standard: GB/T1591-2008low alloy high strength steel.
Q355 steel plate is a low-alloy steel plate, which can be divided into five grades: B, C, D, E, and F. Q355B, Q355C, Q355D, Q355E, and Q355F are all subjected to impact tests, and the temperature is 0˚C, -20˚C, -40. Q355 steel plate executive standard: GB/T1591-2018 low alloy high strength steel.
2.Q345 steel plate and Q355 steel plate delivery status
Q345E steel plates are delivered in the states of controlled rolling,normalizing and tempering, thermomechanical rolling (TMCP), etc. If necessary, Z-direction performance tests are required according to customer needs, such as Q345E-Z15, Q345E-Z25, Q345E-Z35 and so on.
Q355E steel plates are delivered in the states of controlled rolling,normalizing and tempering, thermomechanical rolling (TMCP), etc. If necessary, Z-direction performance tests are required according to customer needs, such as Q355E-Z15, Q355E-Z25, Q355E-Z35, etc.
3. Chemical composition of Q345 steel plate and Q355 steel plate
Q345 chemical composition of steel plate:
| C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | Als |
| ≤0.18 | ≤0.50 | ≤1.70 | ≤0.030 | ≤0.025 | ≤0.07 | ≤0.15 | ≤0.20 | ≤0.30 | ≤0.50 | ≤0.30 | ≤0.012 | ≤0.10 | ≥0.015 |
The chemical composition of Q355 steel plate:
| C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | Als |
| ≤0.14 | ≤0.50 | ≤1.60 | ≤0.025 | ≤0.025 | 0.01-0.05 | 0.01-0.10 | 0.006-0.05 | ≤0.30 | ≤0.50 | ≤0.40 | ≤0.015 | ≤0.10 | ≥0.015 |
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