型号牌号化学成分CSiMnPS916Mn0.16~0.200.30~0.601.30~1.60≤0.045≤0.0501120MnK0.21~0.260.20~0.601.20~1.60≤0.045≤0.05012Q275bQ2750.28~0.37≤0.100.15~0.350.50~0.80≤0.045≤0.050
