High Tensile Nickel Chrome Steel
Steel AISI 4340
Characteristics
It has high hardenability and is capable of giving good properties in large sections. It is relatively free from temper brittleness and retains useful machinability at relatively high hardness.
Equivalent AISI 4340
Thyssenkrupp 6582, DIN 34NiCrMo6, ASSAB 705, VCN 150, JIS SNCM 439, EN 1.6582, EN 1.6562, HQ 705
Availability
Round bar
Outer Diameter (OD) : 20mm - 300mm
Length: 1000mm - 9000mm
Chemical Composition
| C | Si | Mn | P | S | Ni | Cr | Mo | |
| 0.38 - 0.43 | 0.20 - 0.35 | 0.60 - 0.80 | 0.40 Max | 0.04 Max | 1.65 - 2.00 | 0.70 - 0.90 | 0.20 -0.30 |
Mechanical Properties
| Properties | AISI 4340 | |
| Tensile Strength (MPa) | 745 | |
| Yield Strength (MPa) | 470 | |
| Elongation at break (%) | 22 | |
| Hardness (HB) | 217 | |
| Elastic modulus (GPa) | 190-210 | |
| Bulk modulus (GPa) | 140 | |
| Shear modulus (GPa) | 80 | |
| Poisson's ratio | 0.27-0.30 | |
| Supplied Condition | Preharden |
Physical Properties
| Properties | AISI 4340 | |
| Density (×1000 kg/m3) : | 7.85 | |
| Melting point (°C) : | 1427 | |
| Thermal Conductivity (@ 100°C) (W/m-K) | 44.5 | |
| Thermal expansion co-efficient (µm/m°C) | 12.3 |
Applications
Automotive crankshafts and rear axle shafts, aircrafts crankshafts, aircraft landing gear, Connecting Rods, Propeller Hubs, Gears, Drive shafts, Landing gear parts and heavy duty parts of rock drill, power transmission gears and shafts, and other structural parts| Related Steel: | |||||
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