规格每米单重(Kg)MJ名称C100*50*15*2.5  4.310C型钢C100*50*15*2.75  4.700C型钢C120*40*20*3  5.360C型钢C120*50*20*3  5.840C型钢C120*60*20*3  6.310C型钢C140*60*20*3  6.780C型钢C150*50*15*2.