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

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

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

Critical point approximate :Ac3=780℃

Normalizing temperature :850~870℃,hardness 179~229HBS.

Cold pressing workblank softening process :

Temperature 740~760℃,soaking time 4~6h and then by 5~10℃/h cooling , cooling to ≤600℃, out furnace and air cooling .

 Quenching temperature 850℃ ±10℃, oil cooling , tempering temperature 520℃±10℃.coolant  water / oil 

DELIVERY CONDITION :ANNEALED
SURFACE : BLACK / GRINDING / PEELING
DIMENSION : mm
Forged round bar :dia 80-550mm
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:

The steel after quenched & termpered used in make bearing moderate duty and moderate speed machine parts. Such as knuckle of automobile, back axle shaft ,and gear , shaft ,worm spline shaft , center sleeve of machine tool .