S355J2-steel_4448.html target=_blank class=infotextkey>S355JR and S355J2 steel are widely used structure steel under standard EN10025-2. The two steel grades have much in common, as they have same Min. yield strength 355Mpa. However, it is also noted that they have difference in JR and J2. So what is the difference between S355JR and S355J2 steel?
Chemical composition difference between S355JR and S355J2 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 |
| S355J2 | 0.24 max | 0.60 max | 1.70 max | 0.035 max | 0.035 max | 0.60 max | 0.014 max |
Mechanical properties difference between S355JR and S355J2 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 |
| S355J2 | 355 | 450-680 | 22 | -20 | 27 |
In S355JR and S355J2 steel, JR and J2 indicates the steel needs to do +20℃ impact test and -20℃ impact test respectively. The different impact temperature is the main difference between S355JR and S355J2 steel. S355J2 steel can better adapt to low temperature work condition than S355JR steel.
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