常用钢45#,Q345,Q235钢材料成分

45: C:0.42~0.50% Mn: 0.50~0.80% Si: 0.17~0.37% Cr: ≤0.25 毛胚尺寸:25mm 热处理工艺:淬火850水+回火600 力学性能:σs 355Mpa 退火硬度:≤197HB 用途举例:小截面、中载荷的调质件,如主轴、曲轴、齿轮、连杆、链轮等 Q345: C:≤0.20 % Mn:1.00~1.60% Si:0.55% Q345A : P:≤0.045% 拉伸试验:σs 345MPa S:≤0.045% Q345B : P: ≤0.040% 拉伸试验:温度20°C Q345C: P:≤0.035% 拉伸试验:温度0°C S: ≤0.035% Q345D: P:≤0.030% 拉伸试验:温度-20°C S:≤0.030% Q345E: P:≤0.025% 拉伸试验:温度-40°C Q235A: C:0.14~0.22% Mn:0.30~0.65% S不大于0.050% P不大于0.045% Q235B: C:0.12~0.20% Mn:0.30~0.70% S不大于0.045% P不大于0.045% 冲击试验温度:20°C Q235C: Mn:0.35~0.80% S不大于0.040% P不大于0.040% 冲击试验温度:0°C Q235D: C:≤0.17% Mn:0.35~0.80% S不大于0.035% P不大于0.035% 冲击试验温度:-20°C