14NiCrMo13-4, 1.6657, 655M13 - Alloy steel for carburizing

 

Standard Steel Grade
Chemical composition %
C: Mn: Si: P: S: Cr: Mo: Ni: N: V: Ti: Cu: W:
PN 12H2N4A
0.09 - 0.16 0.30 - 0.60 0.17 - 0.37 <0.030 <0.025 1.25 - 1.65 - 3.25 - 3.65 - - - <0.2 -
GOST 12Ch2N4A - 12Kh2N4A - 12Х2Н4А
0.09 - 0.15 0.30 - 0.60 0.17 - 0.37 <0.025 <0.025 1.25 - 1.65 <0.15 3.25 - 3.65 <0.008 <0.05 <0.03 <0.3 <0.2
BS 655M13 - EN36A - EN36B - N3CCH - 36A - 36 A
0.10 - 0.16 0.35 - 0.60 - <0.035 <0.035 0.70 - 1.00 <0.1 3.00 - 3.75 - - - <0.4 -
AFNOR 16NCD17 - 16 NCD 17
0.12 - 0.18 <0.50 <0.50 <0.030 <0.025 1.00 - 1.40 0.15 - 0.45 4.00 - 4.50 - - - - -
AFNOR 16 NC 12 - 16NC12
0.12 - 0.18 <0.50 <0.50 <0.030 <0.025 0.50 - 1.00 - 3.00 - 3.50 - - - - -
ISO 14 Ni 14 - 14Ni14
<0.17 <0.70 <0.30 <0.025 <0.02 <0.3 <0.12 3.25 - 3.75 - <0.05 <0.03 <0.4 -
EN / LW 14NiCrMo13-4 - 1.6657 - LW 6657
0.11- 0.17 0.30 - 0.60 0.30 - 0.60 <0.025 <0.035 0.80 - 1.10 0.20 - 0.30 3.00 - 3.50 - - - - -
UNS AMS
SAE
AMS-S-8503 - AISI 3310 - E 3310
0.08 - 0.13 0.45 - 0.60 0.20 - 0.35 <0.025 <0.025 1.40 - 1.75 - 3.25 - 3.75 - - - - -

 

14NiCrMo13-4, 1.6657, 12H2N4A - Nickel construction steel without molybdenum for aerospace carburization - characteristics

Steel for heat-chemical treatment - carburization is characterized by low hardness, high durability and malleability. The chemical composition contains increased content of nickel and chromium in relation to 2HN3A grade. Designed for sections with intermediate dimensions, exposed to large and variable loads and associated work stresses.

Used, among others, in aviation, in parts and components of internal combustion engines and aviation equipment. Thanks to its properties, it is also used for very important components of machines or vehicles - as steering shafts, adjusting screws, gears, rollers or axles.

12H2N4A steel is its equivalent. It has similar values and chemical composition of 12HN3A steel, but it has a much greater range of Nickel in the chemical composition.
12H2N4A steel should be welded before carburizing, and the product does not require pre-heating prior to the treatment.

Other related chrome-nickel carburizing grades: 12HN3A, 20HN3A, 20H2N4A, 30HN3A, 37HN3A.


Heat treatment - temperature, thermal-mechanical processing, conditions

Thermal treatment and thermo-chemical treatment of steel of 12HN3A grade according to PN-72/H-84035 norm
Softening annealing 640 - 680℃
Normalizing annealing 860 - 880℃
Cyaniding 850 - 880℃
Carburizing 870 - 900℃
Hardening (I) after carburization 845 - 875℃ in oil
Hardening (II) after carburization 780 - 800℃ in oil
Tempering 150 - 210℃ in the air or oil

 


Mechanical properties

- Mechanical properties

  • Tensile strength, Rm = ≥ 1130 MPa
  • Yield point, Re = ≥ 930 MPa
  • Hardness after softening, HB = ≤ 269
  • Elongation, A = ≥ 10%
  • Notch toughness, KU2 = ≥ 72 J
  • Contraction, Z = ≥ 50%

- - Physical properities

  • Density, ρ = ~7,83 kg/dm³
  • Thermal conductivity , λ20℃ = ~33,5 W⋅m⁻¹ K⁻¹
  • Linear Expansion Factor, α = 11,1⋅10⁻⁶ K⁻¹
  • Heat capacity cp 20-100℃ = 490 J⋅​kg⁻¹ K⁻¹

In the grade of 14NiCrMo13-4, 1.6657 we supply:

 


List of equivalents and other determinations of 12H2N4A steel:

12Ch2N4A, 12Kh2N4A, 12Х2Н4А, 655M13, EN36A, EN36B, N3CCH, 36A, 36 A, ČSN 16 420, ČSN 16420, ČSN 416420, 16NCD13, 16 NCD 13, 16NCD17, 16 NCD 17, 16 NC 12, 16NC12, 14 Ni 14, 14Ni14, 14NiCrMo13-4, 1.6657, LW 6657, 12Cr2Ni4A, A43123, A 43123, 12Cr2Ni4, AMS-S-8503, AISI E3310, E 3310


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