... is 340-510MPa. S235J2G3 and S235J2 have the same impact test degree. Both are -20 degree temperature. S235J2G3 steel technology: ... galvanization, pre-treatment ( ball blasting, derusting, painting) inspection from the third party like SGS Katalor International is a professional S235J2G3 steel exporter ... ADD : ROOM 101,NO.16, 6TH BUILDING, 9TH LANE,GUANGYI ROAD,ZHUQIAO TOWN,PUDONG NEW district,SHANGHAI