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SNCM439 / SAE4340 / 40CrNiMoa Alloy Steel Round Bar Forged 80mm Dia

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SNCM439 / SAE4340 / 40CrNiMoa Alloy Steel Round Bar Forged 80mm Dia

Country/Region	china
City & Province	wuxi jiangsu

Product Details

NCM439/4340/40CrNiMo Round Steel Bar

34CrNiMo6 / 1.6582 / 4340 / SNCM439 Alloy Steel Bar Round for Axle, Gear, Fastener

Equivalence

AISI / SAE	DIN / W.Nr	JIS	GB
4340	34CrNiMo6 1.6582	SNCM439	40CrNiMoA

Chemical Composition (%)

Steel Grade	C	Si	Mn	P	S	Cr	Mo	Ni
34CrNiMo6 1.6582	0.30 0.38	≤ 0.40	0.50 0.80	≤ 0.035	≤ 0.035	1.30 1.70	0.15 0.30	1.30 1.70
4340	0.38 0.43	0.15 0.35	0.60 0.80	≤ 0.035	≤ 0.040	0.70 0.90	0.20 0.30	1.65 2.00
SNCM439	0.36 0.43	0.15 0.35	0.60 0.90	≤ 0.030	≤ 0.030	0.60 1.00	0.15 0.30	1.60 2.00

Dimensions

	Hot Rolled	Forged	Cold Drawn
Diameter (mm)	10-260	150-1500	2.5-70
Length (mm)	4000-10000	3000-10000	4000-10000

Delivery Condition

EAF+LF+VD, Hot rolled, Forged or Cold drawn, Black surface or Machined surface (Peeled, Turned, Grinded), Annealed or Q+T, UT 100% Passed

mechnical data

40CrNiMoA Alloy Steel Mechanical Properties

Yield strength: ≥ 835 MPa
Tensile strength: ≥ 980 MPa
Elongation: ≥12%
Rate of reduction in area: ≥55%
Impact absorbing energy: ≥ 78 J
Material Brinell Hardness: ≤ 269 (Annealed or high temperature tempered steel rod)
Sample size: 25mm

Heat treatment specification

First quenching heating temperature: 850 °C (Quenchant– oil)
Tempering heating temperature: 600 °C (Quenchant– water, oil)

It was used where require high tensile and good wear-resistance property parts such as heavy-duty axles, shafts, heavy-duty gears, spindles, pins, studs, bolts, couplings, sprockets, pinions, torsion bars, connecting rods. These high tensile alloy steel has been widely used in the areas such as petrol chemical industry, automotive, steam power equipment and other high temperature services.

Characteristics

It is a low-alloy steel containing chromium and molybdenum and nickel as strengthening agents. The steel has good strength and toughness, hardenability and overheat resistance stability, also high susceptibility of flake formation and temper brittleness. Its poor weldability requires high temperature preheating and stress relieving, before and after process. It should be Hardened and tempered before application.

Applications

This low-alloy steel finds many applications where high strength, plasticity required such as large and important parts requiring hardening and tempering as heavy load axle for heavy machinery, axle with diameter over 250mm for steam turbine, axle of rotor wing for helicopter, axle of turbo and turbine blade and heavy load transmission part for jet engine, fasteners and gear for crank axle. It’s also used for rotor spindle and blade where temperature over 400℃. It can be used as important part with special properties after nitriding and ultrahigh strength steel after low tempering isothermal quenching.