Tag

 AISI 9840 is a nickel-chrome-molybdenum steel  which contains at least 0.85%Ni,0.7%Cr,0.2%Mo as strengthening alloy elements.It is suitable for different heat treatment and shows excellent hardenability, strength,toughness and good cold workability.After annealing,this material  becomes machinable and adjusted for the mechanical cutting.pre-heat and post-weld stress relief are necessary for welding of this alloy,but