1.7707, 30CrMoV9, 1.8519, 31CrMoV9

December 16, 2022 | Tags:
1.7707, 30CrMoV9
1.7707, 30CrMoV9

Structural boiler steel for nitriding 30CrMoV9, 1.7707, 31CrMoV9, 1.8519 acc. to TLV 813802001, DIN 1652-4, DIN 17200, DIN 17204, DIN EN 10250-3

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What is 1.7707, 30CrMoV9 grade steel?

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

GradeChemical composition WT %
CSiMnPSCrMoV
1.7707, 30CrMoV90.26-0.34
0.15-0.400.40-0.70max 0.035
max 0.0352.30-2.70
0.15-0.250.10-0.20
1.8519, 31CrMoV90.27-0.34
max 0.40
0.40-0.70max 0.025max 0.0352.30-2.700.15-0.250.10-0.20

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

Welding Properties

not suitable for welding

What is 1.7707, 30CrMoV9 equivalent to?

30CrMoV9, 31CrMoV9, 31CrMoV9, 30CrMoV9, 1.7707, 1.8519, 30Ch3MF, 30H2MF, 30Kh3MF, 30Х3МФ, 4340

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