Alloy structural steel 35HM, 34CrMo4, 1.7220 designed for heavy-duty parts of machines and devices according to PN-89 / H-84030-04, EN 10083-3

 

StandardsChemical Composition %
Steel Grades
C:Mn:Si:P:S:>Cr:Ni:Cu:
PN30H
0.27 - 0.350.5 - 0.80.17 - 0.37<0.035<0.0350.8 - 1.1<0.3-
EN34Cr4 - 1.7033 - 34 Cr 4
0.30 - 0.370.6 - 0.9<0.40<0.025<0.0350.9 - 1.2--
EN28Cr4 - 1.7030 - 28 Cr 4
0.24 - 0.310.6 - 0.9<0.40<0.025<0.0350.9 - 1.2--
AFNOR32 C 4 - 32C4
0.30 - 0.370.6 - 0.9<0.40<0.035<0.0350.9 - 1.2--
GOST30Х
0.24 - 0.320.5 - 0.80.17 - 0.37<0.035<0.0350.8 - 1.1<0.3<0.3
ASTMAISI 5132 - UNS G51320
0.30 - 0.350.6 - 0.80.15 - 0.35<0.035<0.0400.75 - 1.00--

 

35HM, 34CrMo4, 1.7220 - specification and applications

Structural hardened steel with the best mechanical properties at 40-70mm dimensions, designed for water or oil hardening, and inductiv or fire surface hardening after a thermal improvement after which the hardness of the surface is between 52-57 HRC.

35HM is used for heavy-duty construction parts, machines or equipment where high ductility, abrasion resistance and high temperatures up to 500℃ are required. In many cases, more expensive nickel grades can be substituted by this grade.

The 35HM steel and its substitute 34CrMo4 is used for the production of shafts, high-pressure press columns, pipe fittings, hammer shafts, spindles of large machine tools, screws and nuts, loaded screws, steam turbine parts, turbochargers, axles, rods, rotor discs, covers, gears, crank shafts, engine and engine parts, large machine tool shafts, and toothed rims.


35HM, 34CrMo4, 1.7220 - general mechanical properties

  • Tensile strength, Rm = 1000 - 1200 MPa
  • Yield point, Re > 800 MPa
  • Contraction, Z > 45%
  • Elongation, A > 11%
  • Notch toughness, KV > 35 J
  • Hardness in softened state < 241 HB

 


Mechanical properties for individual dimensions

  • Tensile strength Rm
    • dimensions 16 - 40mm, thickness 8 - 20mm = 900 - 1100 MPa
    • dimensions 40 - 100mm, thickness 20 - 60mm = 800 - 950 MPa
    • dimensions 100 - 160mm, thickness 60 - 100mm = 750 - 900 MPa
    • dimensions 160 - 250mm, thickness 100 - 160mm = 700 - 850 MPa
  • Yield point Re
    • dimensions 16 - 40mm, thickness 8 - 20mm > 650 MPa
    • dimensions 40 - 100mm, thickness 20 - 60mm > 550 MPa
    • dimensions 100 - 160mm, thickness 60 - 100mm > 500 MPa
    • dimensions 160 - 250mm, thickness 100 - 160mm > 450 MPa
  • Contraction, Z
    • dimensions 16 - 40mm, thickness 8 - 20mm > 50%
    • dimensions 40 - 100mm, thickness 20 - 60mm > 55%
    • thickness 100 - 160mm, thickness 60 - 100mm > 55%
    • dimensions 160 - 250mm, thickness 100 - 160mm > 60%
  • Elongation A
    • dimensions 16 - 40mm, thickness 8 - 20mm > 12%
    • dimensions 40 - 100mm, thickness 20 - 60mm > 14%
    • thickness 100 - 160mm, thickness 60 - 100mm > 15%
    • dimensions 160 - 250mm, thickness 100 - 160mm > 15%

 


Heat treatment processes:

  • Annealing with a slow cooling at 680 - 720℃
  • Normalization at 850-880 ℃ with adjustable cooling rate depending on a product dimensions, including softening for optimum workability
  • Normalization at 850 - 880 ℃ heating until the temperature equals at the entire cross section of the material with cooling in calm air
  • Hardening at 830 - 860 ℃ with cooling in water, or at 840 - 870 ℃ in oil
  • Tempering at 540 - 680℃ with cooling in air.

 


Virgamet in the above grades provides:

 


Equivalents, other signs and equivalents of 35CrMo34 4, 1.7220:

34Cr4, 34CrS4, 1.7033, 1.7037, 35H, SCr 2, 35Cr, 34 Cr 4, 34 CrS 4, 28Cr4, 1.7030, 28 Cr 4, 28CrS4, 1.7036, 28 CrS 4, AISI 5132, UNS G513200, UNS G51300, UNS H51320, UNS H51324, 35Cr4, 35 Cr 4, SCr 430, SCr 430 H, 34Cr4H, 34Cr4HH, 34Cr4HL, Cr 135, Cr 1 Z, 32C4, 32 C 4, 30Ch, 30Kh, 30Х


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