Structural steel 40H2MF designed for thermal improvement, surface hardening, for work in high and low temperatures in accordance with PN-89/H-84030-04 standard.

 

StandardsSteel Grades
Chemical Composition %
C:Mn:Si:P:S:Cr:Ni:Mo:V:Cu:
PN40H2MF
0.38 - 0.450.50 - 0.800.17 - 0.37<0.035<0.0351.60 - 1.90<0.300.30 - 0.400.15 - 0.25<0.30
GOST40ChMFA - 40HMFA - 40KhMFA - 40ХМФА
0.37 - 0.440.40 - 0.700.17 - 0.37<0.025<0.0250.80 - 1.10<0.300.20 - 0.300.10 - 0.18<0.30

 

40H2MF, 40ChMFA, 40HMFA - specification and application

Nickel-free, with high hardening capacity grade classified as machine-building steel, high-temperature boiler steel, as well as low-temperature steel, characterized by good ductility, very high durability and good impact resistance in low temperature ranges.

In many cases materials with a particular chemical composition are replaced by chromium-nickel grades (such as 45HN). 40H2MF is a steel which is hardened in oil, but it is possible to obtain optimum mechanical properties with dimensions up to 250mm. It is mainly used in the manufacture of heavy-duty parts and machine components, as steel for shafts, control levers, differential parts, spindles, bolts, axles, crankshafts, connecting rods, cardan shafts and screws.

As a steel for high temperature applications, the products find application in the manufacture of steam turbine shafts, flanges, high pressure cylinders, single and multi-disk rotors, bolts, nuts and screws. Steel is weldable, susceptible to mechanical cutting and, in addition, does not exhibit temper brittleness.

40ChMFA, 40KhMFA, 40ХМФА


Mechanical properties of 40HMF steel

  • Tensile strength, Rm > 1230 MPa
  • Yield point, Re > 1030 MPa
  • Elongation, A > 9%
  • Contraction, > 40%
  • Notch toughness, KU2 > 40 J
  • Hardness in softened state < 241 HB

 


Mechanical properties for individual dimensions

  • Tensile strength Rm
    • dimensions 16 - 40mm = 1230 - 1420 N/mm2
    • dimensions 40 - 100mm = 1080 - 1230 N/mm2
    • dimensions 100 - 160mm = 980 - 1180 N/mm2
    • dimensions 160 - 250mm = 880 - 1080 N/mm2
  • Yield point Re / Rp0,2
    • dimensions 16 - 40mm > 1030 N/mm2
    • dimensions 40 - 100mm > 880 N/mm2
    • dimensions 100 - 160mm > 780 N/mm2
    • dimensions 160 - 250mm > 690 N/mm2
  • Contraction Z
    • dimensions 16 - 40mm > 40 %
    • dimensions 40 - 100mm > 40 %
    • dimensions 100 - 160mm > 45 %
    • dimensions 160 - 250mm > 45 %
  • Elongation A
    • dimensions 16 - 40mm > 9 %
    • dimensions 40 - 100mm > 10 %
    • dimensions 100 - 160mm > 11 %
    • dimensions 160 - 250mm > 12 %
  • Notch toughness, KU2
    • dimensions 16 - 40mm > 40 J
    • dimensions 40 - 100mm > 40 J

Heat treatment of 40H2MF steel

  • Softening at 680 - 720℃ with slow cooling
  • Normalizing at 850 - 870℃ with cooling in air
  • Hardening at 830 - 860℃ with cooling in oil
  • Tempering at temperatures 500 ° c with cooling in the air

 


Rolex Metal in the above grades provides:


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