الوصف

alloy structural steel：*0CrNiMoA  AISI***0 *6CrNiMo4, 1.***0
standard：GB/T ********8
●Chemical composition：
C ：0.*7～0.*4
Si：0.*7～0.*7
Mn：0.*0～0.*0
S ：allow remains content≤0.**5
P ：allow remains content≤0.**5
Cr：0.*0～0.*0
Ni：1.*5～1.*5
Cu：allow remains content≤0.**5
Mo：0.*5～0.*5
●mechanical properties：
 tensile strength  σb (MPa)：≥**0(**0)
yield strength σs (MPa)：≥**5(*5)
extensibility  δ5 (ï¼…)：≥*2
reduction of area  ψ (ï¼…)：≥*5
ballistic work Akv (J)：≥*8
notched bar impact strength  αkv (J/cm2)：≥*8(*0)
rigidity   ：≤**9HB
specimen size：specimen size of rough *5mm
●heat treatment regime and metallurgical structure：
heat treatment regime ：quenching **0℃,oil cooling ;backfire **0℃,water cooling 、oil cooling。
●deliver position ：heat treatment（normalizing、annealing or high-temperature backfire）or no heat treatment，this should be shown on the contract.