It is easy to buy EN 10025 S355JR steel in China. Because almost all the main Chinese steel mills produce this grade. Meanwhile, there is also EN 10025 S355JR equivalent grade in China, and it is low alloy high strength structural steel Q345B. Many users and engineers also know Q345B steel, as it has been well accepted with excellent performance in structural projects and moderate price, as well as easily available stock resources on the market.
Below let us check the common points and differences of EN 10025 S355JR equivalent grade Q345B and S355JR steel from chemical composition and mechanical properties.
Chemical composition of EN 10025 S355JR equivalent grade in China:
| Grade | C (t≤16mm) | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo |
| Q345B | 0.20 max | 0.50 max | 1.70 max | 0.035 max | 0.035 max | 0.07 max | 0.15 max | 0.20 max | 0.30 max | 0.50 max | 0.30 max | 0.012 max | 0.1 max |
| S355JR | 0.27 max | 0.60 max | 1.70 max | 0.045 max | 0.045 max | - | - | - | - | - | 0.60 max | 0.014 max | - |
Mechanical properties of EN 10025 S355JR equivalent grade in China:
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min | Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/%(3mm≤t≤40mm) min | Charpy V test | |
| Temperature/℃ | Impact energy (Longitudinal)/J min | ||||
| Q345B | 345 | 470-630 | 20 | 20 | 34 |
| S355JR | 355 | 470-630 | 22 | 20 | 27 |
We can find the chemical composition and mechanical properties of EN 10025 S355JR equivalent grade Q345B and S355JR steel is very close to each other. The Q345B steel has even higher requirement for chemical composition than S355JR steel. And the strength of S355JR steel is little higher than Q345B steel only in very few conditions. Generally, they can meet demands of each other. And Q345B steel is undoubtedly the EN 10025 S355JR equivalent grade in China.
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