扩孔钢 BR440/590HE HR440/580HE BR600/780HE 主要经营各大钢厂的热轧卷板,热轧酸洗,冷轧卷,镀锌板卷,汽车钢,电工钢等资源 扩孔钢 BR440/590HE HR440/580HE BR600/780HE