14NiCrMo13-4, 1.6657, 655M13 - Case-hardening 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 15NiCr13 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.
14NiCrMo13-4 steel is its equivalent. It has similar values and chemical composition of 15NiCr13 steel, but it has a much greater range of Nickel in the chemical composition.
14NiCrMo13-4 steel should be welded before carburizing, and the product does not require pre-heating prior to the treatment.
Heat treatment - temperature, thermal-mechanical processing, conditions
| Thermal treatment and thermo-chemical treatment of steel of 12H2N4A / 14NiCrMo13-4 grade | ||
|---|---|---|
| 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:
- round bars and square bars
- Flat bars
- Forged bars
- Forgings
- Forged flat bars
- Forged rings and discs
- Forged cubes
- forged flat and square bars
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, AISI 9310