... be used for mine tram road size:9#,11#,12#,20# Materials:Q235 Length:8,9,10 standard ... ISO9001:2000 HeBei YongYang Steel Company Ltd. is a joint venture with registered capital of RMB 23million ... of the mine usage steel of 9#11# & 12#, U-Beam for the mine support steel of 25U29U ... company has the best facility and test instrument with a fully- completed inspection system and advanced science technical ...