1.7707, 30CrMoV9, 1.8519, 31CrMoV9
1.7707, 30CrMoV9 steel is low-alloyed, used in the energy industry for the parts working in high temperatures below 540°C. used in the manufacture of screws, nuts, parts of turbines and other equipment for the energy industry
Chemical Composition
| Grade | Chemical composition WT % | |||||||
|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Mo | V | |
| 1.7707, 30CrMoV9 | 0.26-0.34 | 0.15-0.40 | 0.40-0.70 | max 0.035 | max 0.035 | 2.30-2.70 | 0.15-0.25 | 0.10-0.20 |
| 1.8519, 31CrMoV9 | 0.27-0.34 | max 0.40 | 0.40-0.70 | max 0.025 | max 0.035 | 2.30-2.70 | 0.15-0.25 | 0.10-0.20 |
Mechanical Properties
1.7707, 30CrMoV9 +QT Mechanical properties - TLV 813802001
- Dia.40mm to 100mm
- Tensile strength Rm MPa: Min 1080-1270
- Yield Strength Rp MPa: Min 880
- Elongtion after fracture (l=5d)A %: min 10
- Necking: min 40 %
- Absorbed energy: min 41 J
- Dia.100mm to 600mm
- Tensile strength Rm MPa: Min 980-1180
- Yield Strength Rp MPa: Min 780
- Elongtion after fracture (l=5d)A %: min 11
- Necking: min 45 %
- Absorbed energy: min 48 J
1.8519, 31CrMoV9 QT Mechanical properties
- Condition +A(Annealed)
- Hardness, HB: max 248
- Condition +QT
- Tensile strength, Rm: 850 - 1300 MPa
- The yield point, Re: min 650 MPa
- Elongation, A: min 9%
- Impact resistance, KV: min 25J
Physical Properties
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Heat Treatment
Soft Annealing
Heat to 680-720oC, cool slowly. This will produce a maximum Brinell hardness of 248.
Hardening
Harden from a temperature of 850-880oC followed by oil quenching.
Tempering
Tempering temperature: 570-680oC.
Nitriding
Gas/plasma nitriding temperature (gas, salt bath): 570-580oC
Gas/plasma nitriding temperature (powder, plasma): 580oC
Surface hardness after nitriding: 800 HV
Thermal Properties
Welding Properties
not suitable for welding
Machining Properties
Similar or Equivalents Steel Grade
30CrMoV9, 31CrMoV9, 31CrMoV9, 30CrMoV9, 1.7707, 1.8519, 30Ch3MF, 30H2MF, 30Kh3MF, 30Х3МФ, 4340