... , Roller steel, Military steel, Heat-resistant steel and so on) and more than 100 steel grades. Some products like S45C ... H13, SAE52100,SK3 and so on are not only used to chinese railway, coal mine, petroleum, shipbuilding industries but also ermany, ... the Shandong Foreign Ecomomic & Trade Bureau, holding the independent import and export management right, a large-scale special steel enterprise with ...