20NiCrMo2 alloy structrue steel

PRODUCT NAME :Alloy structure steel round bar ( forged ,rolled )
STANDARD:
GB/T3077-1999 EN10083-1 EN10083-3 ISO 683-1
GRADE COMPARISION:

 GB/T6402-2008 / SEP921-84. ASTM A388 ULTRASONIC STANDARD:   

CHEMICAL COMPOSITION:

MANUFACTURING TECHNIQUE:    

EFA+LF+VD(ESR)+ hot forged (hot rolled )
HEAT TREATMENT SPECIFICATION AND MECHANICAL PROPERTIES:

Quenching temperature (℃):850

Tensile strength σb (MPa):≥980(100)

Yeild strength σs (MPa):≥735(80)

elongation δ5 (%):≥9

Reduction area  ψ (%):≥40

Impact  Akv (J):≥47

Hardness :≤229 

SURFACE : BLACK / GRINDING / PEELING
DIMENSION : mm
Forged round bar :dia 80-650mm
Rolled round bar :dia 16-250mm
Coild rod : dia 5.5-20mm
Wire : dia 0.2-13mm
Rolled flat bar :thickness 5-90× width 44-300mm
Forged flat bar:thickness 120-800×width 120-800
length : forged bar free length 4-5.8M,rolled bar 5.8M. for customers special requirment, the bar length can do 20 meters long.
Tolerance on diameter of forged bar : black surface -0/+5mm, peeled surface -0/+3mm.
REMARK:
Above listed parameters and sepcification only for reference . Specific parameters according to standard. Requirments beyond standard will be negotiate by both sides .
Delivery state:

Forged and slow cooling .

normalized ,annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc. Should be indicated in contract .
Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or industry standards, or based on agreements with customers.

Packing :
Forged bar , rolled bar and coil packing in loose . Rolled wire packing in plastic woven cloth or wooden case.
APPLIED RANGE:

Used for make gear in drive system and engine of small and medium size automobile , tractor. Also can make carburized parts cyaniding parts which required higher performance in center. Such as claw and cone body of  roller bit which used in oil drilling and metallurgy open-air mining.   Also can make gear whole rotor of steam turbine , connecting rod of internal combustion engine, and valve section forgings .