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

 


Virgamet in the above grades provides:


THIS WEBSITE USES COOKIES TO IMPROVE AND FACILITATE YOUR ACCESS TO THE WEBSITE AND TO KEEP STATISTICS. IF YOU CONTINUE TO USE THIS SITE, YOU AGREE THAT THE COOKIES WILL BE STORED ON YOUR DEVICE
PRIVACY POLICY
How do I disable cookies
AGREE