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.
