舞钢A709-50F-2美标桥梁用钢基本情况介绍

1、A709-50F-2材料类别：合金结构钢是美国标准牌号，用于制造铆接和螺栓连接的公路桥梁和铁路桥梁(包括跨海桥梁)。

2、A709-50F-2是美标桥梁板, 用于制作铆接及栓焊结构的公路桥及铁路桥梁（包括跨海大桥）。

3、A709是指美国标准：ASTM A桥梁用结构钢，该标准与我国的《GB/T桥梁用结构钢》GB/T 714结构钢类同，当然由于标准体系不同，里面的数据是不一样的。50是ASTM A709标准中的等级（在我国称为钢号）A709-50T-2、 A709-50F-2。

4、桥梁用钢

       用于建造铁路和公路桥梁的钢。要求具有较高的强度和足够的韧性、低的缺口敏感性、良好的低温韧性、抗时效敏感性、抗疲劳性能和焊接性能。主要用钢为Q345q、Q370q、Q420q等低合金高强度钢。

5、也就是屈服强度为345MPa的桥梁用结构钢，这个等级相当于我国GB/T 714标准中的钢号：Q345q

-2表示：夏比V型缺口冲击试验区号

它有两种情形：在材料级别代号后面应标上字母T：2区为 4°C下≥20J

在材料级别代号后面应标上字母F：2区为 4°C下≥34J

问题中指明了区号为2区，但没指明T还是F，完整的描述如：A709-50T-2

6、A709-50F-2包装、标志、质量证明书：钢板的包装、标志、质量证明书应符合GB/T 247的规定。

7、A709-50F-2化学成分：

C≤0.23    Si0.15-0.4    Mn≤1.35    P≤0.025    S≤0.02    Alt≥0.02

PS：具体化学成分应在钢厂材质书中注明。

8、应用范围：

      应用于制作铆接及栓焊结构的公路桥及铁路桥梁（包括跨海大桥）。桥梁用钢 ，                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          用于建造铁路和公路桥梁的钢。要求具冇较高的强度和足够的韧性、低的缺口敏感性、良好的低温韧性、抗时效敏感性、抗疲劳性能和焊接性能。主要用钢为Q345q、Q370q、Q420q等低合金高强度钢。