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S355JR and S355J0 steel are widely used structure steel with standard specification of EN10025-2. From the grade, we can know they have much in common, as they have same Min. yield strength 355Mpa. However, it is also noted that they have difference in JR and J0. So what is the difference between S355JR and S355J0 steel?
Chemical composition difference between S355JR and S355J0 steel: %
| Grade | C | Si | Mn | P | S | Cu | N |
| S355JR | 0.27 max | 0.60 max | 1.70 max | 0.045 max | 0.045 max | 0.60 max | 0.014 max |
| S355J0 | 0.24 max | 0.60 max | 1.70 max | 0.040 max | 0.040 max | 0.60 max | 0.014 max |
Mechanical properties difference between S355JR and S355J0 steel:
| 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 | ||||
| S355JR | 355 | 450-680 | 22 | 20 | 27 |
| S355J0 | 355 | 450-680 | 22 | 0 | 27 |
In S355JR and S355J0 steel, JR and J0 indicates the steel needs to do +20℃ impact test and 0℃ impact test respectively. The different impact temperature is the main difference between S355JR and S355J0 steel. S355JR steel can better adapt to higher temperature work condition than S355J0 steel.
