ASTM牌号 C Si Mn P S Cr Ni Mo other Min 0 0 5.50 0 0 16.00 3.50 Max 0.15 1.00 7.50 0.06 0.03 18.00 5.50 Min 0 0 0 0 0 16.00 6.00 Max 0.15 1.00 2.00 0.045 0.03 18.00 8.00 Min 0 0 0 0 0 17.00 8.00 Max 0.15 1.00 2.00 0.045 0.03 19.00 10.00 Min 0 0 0 0 0.15 17.00 8.00 0 Max 0.15 1.00 2.00 0.20 / 19.00 10.00 0.60 Min 0 0 0 0 0 18.00 8.00 Max 0.08 1.00 2.00 0.045 0.03 20.00 10.50 Min 0 0 0 0 0 18.00 8.00