S355 steel is named based on it's minimum yield strength of 355 Mpa (N/mm2). However, the yield strength of S355 steel reduces when you go up in thickness above 16 mm for flat products and hollow sections.
For S355J2 steel, J2 means it can withstand an impact energy of 27J at -20°C. And sometime S355J2 is followed by a letter H, appeared as S355J2H, here H stands for hollow section.
What is the difference between S355J2 and S355J2H steel? S355J2H means S355J2 hollow section, the product shape for S355J2H steel is pipe/ tube, complying to technical standard of EN10210. While product shape for S355J2 steel is mainly flat steel, especially common as S355J2 steel plate, complying to technical standard of EN10025-2.
What is the difference between S355J2 and S355J2H steel? S355J2 steel plate is mostly used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, mechanical parts, building structure, general metal parts, etc. S355J2H steel pipe is mainly used in oil and gas industries, automobile and engineering industries.
