Designation by Standards
| Steel No. | DIN | EN | AISI | JIS | ГОСТ |
| 1.8159 | 50CrV4 † | 51CrV4 | 6145/6150 | / | 50ChGFA |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.42 | max. 0.40 | 0.90 | 1.05 | - | - | 0.20 | - | - |
Description
1.8159 is a heat treatable, low alloy steel containing manganese, chromium and vanadium. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength.
Applications
Permanently stressed machine, engine and vehicle parts when high strength and toughness are required.Most severely stressed springs for trucks, torsion springs.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.84
Soft Annealing
Heat to 640-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Normalizing
Temperature: 840-880oC.
Hardening
Harden from a temperature of 820-860oC followed by oil quenching.
Tempering
Tempering temperature: 540-680oC.
Mechanical Properties in Hardening and Tempering Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Reduction of area (%) | Notch impact energy (ISO-V) (J) |
| <16 | 900 | 1100-1300 | 9 | 40 | 30 |
| 17-40 | 800 | 1000-1200 | 10 | 45 | 30 |
| 41-100 | 700 | 900-1100 | 12 | 50 | 30 |
| 101-160 | 650 | 850-1000 | 13 | 50 | 30 |
| 161-250 | 600 | 800-950 | 13 | 50 | 30 |
Forging
Hot forming temperature: 1050-850oC.
Machinability
Machining is best done with this alloy in the annealed or normalized and tempered condition. It can be machined by all conventional methods.
Corrosion Resistance
This is a low alloy steel and not a corrosion resistant alloy. Protective coating should be used.
Welding
The alloy can be fusion or resistance welded. Preheat and post heat weld procedures should be followed when welding this alloy by established methods.
Cold working
The 1.8159 alloy may be cold worked, in the annealed condition, by conventional methods and tooling. It has good ductility.
Remark
All technical information is for reference only.