1)I-beam of mine usage steel:9#,11#,12# 2)Material: 20MnK/Q235 3)Length:8m, ... 9m,10m 4)Standard:YB/T5047-2000 I-beam of ... mine usage steel:9#,11#,12# THE LIST OF YYGT Name of CommoditySpecificatonMaterialsStandard of ProductsTheory WeightLength of Dimension (m)Packed in ...