12# Mining I-Beam can be used for mine tram road ... #,20# Materials:Q235 Length:8,9,10 standard:ISO9001:2000 I-Beam 12# can be used for mine tram road ... #,11#,12#,20# Materials:Q235Length:8,9,10standard:ISO9001:2000 HeBei YongYang Steel Company Ltd. is a joint venture ... 50 KGS/M, the crane rail of QU70QU80QU100 & QU120, I-beam of the mine usage steel of 9#11# & ... now on more than ten years. 12# Mining I-Beam