... 68-630*180mm length:6m/9m/12m hot rolled I beam Tangshan yunfeng industrial and trading Co., ltd ... fist level agent of JINXI, LAIWU and CHANGZHI, which is one of the biggest steel manufacturers in China. ... many years, with the strength of H BEAM, I BEAM, ANGLE STEEL AND U CHANNEL STEEL with the ... ISO9001:2008 International Quality Control System Standards.This I-beam is used to support the first floor ...