Structural alloy steel 30HN2MFA for thermal improvement, used in aviation, military and reinforcement industries for heavy duty parts according to GOST 4543-71, PN-72/H-84035.

Standards Steel Grades
Chemical Composition %
C: Mn: Si: P: S: Cr: Mo: Ni: V: Cu: Ti: Al: W:
PN 30HN2MFA
0.26 - 0.33 0.3 - 0.6 0.17 - 0.37 <0.030 <0.030 0.6 - 0.9 0.2 - 0.3 2.0 - 2.5 0.15 - 0.30 <0.2 - - -
GOST 30ChN2MFA - 30KhN2MFA - 30ХН2МФА
0.27 - 0.34 0.3 - 0.6 0.17 - 0.37 <0.025 <0.025 0.6 - 0.9 0.2 - 0.3 2.0 - 2.4 0.10 - 0.18 <0.3 <0.03 - <0.2
GOST 30ChN3M2FA - 30HN3M2FA - 30KhN3M2FA - 30ХН3М2ФА
0.26 - 0.32 0.2 - 0.5 0.17 - 0.37 <0.025 <0.022 1.2 - 1.7 0.40 - 0.65 3.0 - 3.5 0.10 - 0.20 <0.25 - - -
GOST 30ChN2MFA-Sh - 30KhN2MFA-Sh - 30ХН2МФА-Ш
0.33 - 0.40 0.25 - 0.50 0.17 - 0.37 <0.025 <0.025 1.2 - 1.5 0.35 - 0.45 3.0 - 3.5 0.10 - 0.18 <0.3 <0.03 - <0.2

 

30HN2MFA - specification and applications

30HN2MFA material is a special, rare steel grade with great hardenability for products with medium and large dimensions, used to produce particularly heavy machinery, engines, vehicles, and rifle barrels in the air industry, automotive, power and defense industries in environments of lowered and elevated temperatures. The best properties are obtained to a dimensions of 80mm.

The steel is used for the production of drive shafts, axles, connecting rods, shafts, rotors, discs, planetary gear components, cardan shafts, and barrels of rifles. Products in the 30HN2MFA grade are prone to flaking and exhibit limited weldability, insensitivity to tempering and their heat treatment is carried out with cooling in the oil.

Rolled and forged materials in this grade do not exhibit corrosion resistance and their weldability is particularly limited - it requires pre-heating of the product. Steel most commonly delivered after softening annealing.


General mechanical and physical properties:

  • Tensile strength Rm > 880 MPa
  • Yield point, Re > 780 MPa
  • Elongation, A > 9%
  • Contraction, Z > 45%
  • Notch toughness, KU2 > 48J
  • Linear expansion factor, α20-100℃ = ~10,9 ⋅ 10-6 K-1
  • Heat conductivity λ20℃= 54,34 W ⋅ m-1 ⋅ K-1
  • Hardness in an annealed condition < 241 HB

Mechanical properties of 30HN2MFA grade for individual dimensions

Mechanical properties Dimensions
< 16mm 16 - 40mm 40 - 100mm 100 - 250mm
Tensile strength, Rm (MPa) 980 - 1130 880 - 1030 780 - 930 690 - 830
Yield point, Re (MPa) 880 - 1030 740 - 880 640 - 780 590 - 740
Elongation, A5 (%) 9 - 15 9 - 15 10 - 16 12 - 18
Impact resistance, KM (J/cm2) 60 - 120 70 - 140 70 - 140 90 - 180

Heat treatment - processes, temperatures and cooling:

  • Annealing with slow cooling at a temperature of 650 - 700℃
  • Normalizing annealing with cooling in calm air at 840 - 880℃
  • Hardening in oil at 845 - 875℃
  • Tempering with cooling in water or oil at 630 - 730°C

 


Virgamet company in the beforementioned grade provides:


equivalents according to other standards:

30ChN2MFA, 30KhN2MFA, 30ХН2МФА, 30ChN3M2FA, 30HN3M2FA, 30KhN3M2FA, 30ХН3М2ФА, 30HN2MFAŻ, 30ChN2MFA-Sh, 30KhN2MFA-Sh, 30ХН2МФА-Ш


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