Lub tuam txhab lub ntsiab: baosteel, taigang, anshan hlau thiab hlau smelting, shagang, cultivation, nanyang han, xingcheng, yingkou, masteel, tangsteel, Wen Feng, PingGang thiab lwm yam steel mills loj ('s board: Q235A, Q25C, Q235E), (tsawg alloy: Q345A, Q345B, Q345C Q345D, Q345E), (carbon steel guitar: 35 #, 45 #, 50 #), phaj (ntim): Q345R, (boiler phaj: Q245R), (steel, 65 mn, 40 cr, 42 crmo)