化學性能: C ≤0.12 Si ≤0.40 Mn ≤1.8 P ≤0.025 S ≤0.015 Ni ≤0.75 Cr ≤0.70 Mo ≤0.50 Nb ≤0.060 Ti ≤0.020 B ≤0.0020 力學性能: Rel Mpa ≥685 Rm Mpa≥785 標距(mm) LO50 A% ≥15 180°彎曲試驗 d3a 沖擊試驗Akv J -20℃沖擊≥40