Alloy Steel AISI 4340/DIN1.6511/40CrNiMo/439 1.Diameter:10-40mm, Length:1200mm-5800mm; 2.Annealed to HB= ... 229 3.surface Black Alloy Tool Steel AISI 4340/DIN 1.6511/40CrNiMo/SNCM439It is used for vane,shaft,bolt of ... large dia steamer. 1)Chemical composition: C:0.40, Si0.30, Mn:0.55 ... , P≤0.025, S≤0.025, Cr:0.80, Ni:1.35, Mo:0.20 2)Annealed Hardness:269, Hardness:850 ...