Steel grades13CrMo4-5, 10CrM...15H11MF, 15H12WM...

15H11MF, 15H12WMF, 15Ch11MF, 15Ch12VNMF - boiler steel

15H11MF, 15H12WMF, 15Ch11MF, 15Ch12VNMF - boiler steel, data according to GOST 18968-73 and OST 108.958.04-85

Standard Grade
Chemical composition %
C: Si: Mn: P: S: Cr: Mo: Ni: V: W:
PN 15H11MF
0.11-0.18 <0.5 <0.6 <0.03 <0.025 10.0-12.0 0.5-0.7 <0.6 0.25-0.40 -
GOST 15Ch11MF / 1Ch11MF
0.12-0.19 <0.5 <0.7 <0.03 <0.025 10.0-11.5 0.6-0.8 <0.6 0.25-0.40 <0.2
PN 15H12WMF
0.12-0.18 <0.04 0.5-0.9 <0.03 <0.03 11.0-12.5 0.5-0.7 0.4-0.8 0.15-0.30 0.7-1.1
GOST 15Ch12VNMF
0.12-0.18 <0.04 0.5-0.9 <0.03 <0.025 11.0-13.0 0.5-0.7 0.4-0.8 0.15-0.30 0.7-1.1

15H11MF, 15H12WMF, 15Ch11MF, 15Ch12VNMF - description

Chromium-Molybdenum-Tungsten-Vanadium (-Tungsten, in case of 15Ch12VNMF) heat-resistant steel used in the power industry. Applied mainly for blades of steam turbines, valve spindles and other components operating in high temperature (up to 600°C), fasteners for example. It has great vibration damping capacity.

The steel is hard to weld. Welding of Chromium-Molybdenum-Vanadium steel should not take place at a temperature lower than 10°C. Proper preparation of the surface and preheating is required before welding. The recommended preheating temperature is about 250-300°C. Don't heat faster than 30-50°C per hour. The entire welding area must be thoroughly heated. Cover the joint with asbestos after the process to slower cooling.

Physical and mechanical properties

15Ch11MF - general mechanical properties in heat-treated condition (bars <60mm thick):

  • Yield strength Re: 590-755 MPa
  • Tensile strength Rm: > 740 MPa
  • Elongation A: > 15 %
  • Percent reduction of area Z: > 50 %
  • Hardness HB: 229-269
  • Diameter cone impression: 3.7-4.0 mm
  • Impact Value KCU. 20°C: > 59 J/sm2

15Ch11MF - mechanical properties in annealed condition:

  • Hardness HB: < 229
  • Diameter cone impression: > 4 mm

Mechanical properties of 15Ch11MF forgings for turbines and compressors (KP50 strength group):

  • Thickness: < 250 mm
    • Re: > 490 MPa
    • Rm: > 685 MPa
    • A: > 14 %
    • Z: > 40 %
    • HB: 212-248
    • KCU. 20°C: > 59 J/sm2
  • Thickness: < 200 mm
    • Re: 490-605 MPa
    • Rm: > 685 MPa
    • A: > 16 %
    • Z: > 50 %
    • HB: 212-248
    • KCU. 20°C: > 59 J/sm2

Mechanical properties of 15Ch11MF forgings for turbines and compressors (KP55 strength group):

  • Re: > 540 MPa
  • Rm: > 685 MPa
  • A: > 13 %
  • Z: > 35 %
  • HB: 232-262
  • KCU. 20°C: > 49 J/sm2

Mechanical properties of 15Ch11MF forgings for turbines and compressors ("KP55 S" strength group):

  • Re: 540-665 MPa
  • Rm: > 705 MPa
  • A: > 15 %
  • Z: > 50 %
  • HB: 232-262
  • KCU. 20°C: > 59 J/sm2

15Ch12VNMF - general mechanical properties in heat-treated condition (bars <60mm thick):

  • Yield strength Re: 590-735 MPa
  • Tensile strength Rm: > 740 MPa
  • Elongation A: > 15 %
  • Percent reduction of area Z: > 50 %
  • Hardness HB: 229-269
  • Diameter cone impression: 3.7-4.0 mm
  • Impact Value KCU. 20°C: > 59 J/sm2

Mechanical properties of 15Ch12VNMF forgings for turbines and compressors (KP60 strength group):

  • Re: > 590 MPa
  • Rm: > 735 MPa
  • A: > 15 %
  • Z: > 35 %
  • HB: 235-277
  • KCU. 20°C: > 44 J/sm2

We deliver this steel alloy as:

  • Forgings
  • Rods

Replacements, equivalents and other designations:

15H12WMF, 15Ch12VNMF, 20Ch12VNMF, 15H11MF, 15C11MF, 1Ch11MF, 14Cr11MoV, 1Cr11MoV

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