一、牌号：Q550NHD二、Q550NHD交货状态：热轧、控轧、正火三、Q550NHD技术标准：GBT 4171-2008四、Q550NHD耐候钢介绍Q550NHD是介于普通钢和不锈钢之间的低合金钢系列，属于焊接耐候钢，也叫耐大气腐蚀钢，分为Q550NHA、Q550NHB、Q550NHC、Q550NHD、Q550NHE五个等级。Q是屈…