Chromium structural steel for thermal improvement 30H, 34Cr4, 1.7033 according to PN-89/H-84030-04 and 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--

 

Steel 30H/34Cr4 - implementation and specification

Structural steel designed for heat improvement with low hardness and high ductility, easy for thermo-mechanical treatment, which achieves the best mechanical properties in the dimensions of 30-45mm, depending on the heat treatment method (hardening in oil/water). Products in this grade are used in the manufacture of parts and subassemblies of machines, structures and small vehicles.

The 30H steel is a derivative of the 40H and 20H grades which are distinguished by the range of carbon content (20H for carburizing), with alloy additives remaining at a similar percentage. The 30H steel is in many situations a good and at the same time a cheaper alternative to chromium-nickel species, where small dimensions of the final product are preserved.

Materials in the aforementioned grade are weldable, but the joining processes are not advisable for steel users. Supplied in the form of bars, wires and forgings, is used for such parts and components as spigots, nuts, axles, shafts, rockets, bolts, nuts, rollers, couplings, gears, levers, piston rods for pumps.


Mechanical Properities

  • Tensile strength Rm > 880 MPa
  • Yield point Re > 540 MPa
  • Notch toughness, KU2 > 56 J
  • Elongation, A > 12%
  • Contraction, Z > 45 %
  • Hardness in softened state < 187 HB

 


Mechanical properties depending on the dimensions

  • Tensile strength Rm
    • dimensions <16mm = 880 - 1030 N/mm2
    • dimensions 16 - 40mm = 780 - 930 N/mm2
    • dimensions 40 - 100mm = 690 - 830 N/mm2
  • Yield point Re
    • dimensions <16mm = > 740 N/mm2
    • dimensions 16 - 40mm = > 590 N/mm2
    • dimensions 40 - 100mm = > 490 N/mm2
  • Contraction Z
    • dimensions <16mm = > 45 %
    • dimensions 16 - 40mm = > 45 %
    • dimensions 40 - 100mm = > 45 %
  • Elongation A
    • dimensions <16mm = > 13 %
    • dimensions 16 - 40mm = > 13 %
    • dimensions 40 - 100mm = > 14 %

 


Heat treatment - processes, temperatures, cooling

  • Slow softening annealing at 680 - 720℃
  • Normalizing at 850 ° c with cooling in calm air (improved heat treatability)
  • Hardening with cooling in water at the temperature of 830 - 860 ℃
  • Hardening with cooling in oil at the temperature of 850 - 870 ℃
  • Tempering at temperatures between 550 - 650℃ in water or oil

 


Virgamet company in 30H / 34Cr4 / 1.7033 grade provides:

 


Steel 30H - counterparts, alternatives and similar designations:

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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