Product Details

Product Description

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

GB		ASTM	BS	JIS	DIN
40CrNiMoA	40XHMA	4340	871M40	SNCM439	40NiCrMo22

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

CHEMICAL COMPOSITION:

C	Si	Mn	P≤	S≤	Cr	Mo	Ni
0.37/0.44	0.17/0.37	0.50/0.80	0.025	0.025	0.60/0.90	0.15/0.25	1.25/1.65

MANUFACTURING TECHNIQUE:

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

Quenching temperature (℃):850

Tensile strength σb (MPa):≥980(90)

Yeild strength σs (MPa):≥835(75)

elongation δ5 (%):≥12

Reduction area ψ (%):≥55

Impact Akv (J):≥78

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 large section and more important quenching parts which required higher strength, toughness . For example transmission eccentric shaft of horizontal type forging machine , crank shaft of forging press . After quenched make important parts which require better plasticity,higher strength and large dimension. Such as heavy load shaft of heavy-duty machinery,diameter greater than 250mm shaft of steam turbine,blade , high loading transmission parts ,fasteners , cank shaft ,gear etc.