Q345低合金鋼氣保焊絲
廣泛應(yīng)用于橋梁、車輛、船舶、建筑、壓力容器、特種設(shè)備等
Q345A:C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035;
Q345B:C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035;
Q345C:C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.030，Al≥0.015;
Q345D:C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.025，Al≥0.015;
Q345E:C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.025，S≤0.020，Al≥0.015;
Q345A、B、C、D、E均含Nb≤0.07，V≤0.15，Ti≤0.20，Cr≤0.30，Ni≤0.012，Mo≤0.10。
抗拉強(qiáng)度:490-675MPa 屈服強(qiáng)度:≥345MPa 伸長率:≥22%
