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ALLOY STEELS
Case Hardening Steel
Case Hardening Steel
Case hardening steels typically have a relatively low carbon level (0.10-0.25%) and are one of the best steel choices when there is a demand for variable properties such as components such as gears, piston pins, pulleys, etc.
Case hardening steels have a structure with a hard surface and a relatively soft core.
Specifications :
- Extra strength and shock absorption.
- It can withstand more force without succumbing to deformation.
- It shows high level resistance against abrasion and corrosion.
- Suitable for use in areas where machine parts require strength and strength.
Usage of Areas :
Case hardening steels are used for various structural parts (light and medium strength) piston pins, bevel gears, transmission shafts, krameyer gears, sprockets, mahruti gear, ring gear, etc.
Technical Details
| MKE Norm | DIN No | TOOL No. | SAE AISI | GENERAL AREAS OF USE |
|---|---|---|---|---|
| Ç 1020 | Ck 22 | 1.1151 | 1020 | Components for light loads, piston pins, gears, chain rollers and links, axle pulleys, shafts |
| Ç 3115 | 13CrNi6 | 1.5713 | 3115 | Gears, machine and auto parts, connecting rods, bolts, pins, axles of all types with moderate stress |
| Ç 3315 | 14NCr14 | 1.5752 | 3315 | High-stress spur and bevel gears, shafts, transmission shafts, krameyer gears, aircraft parts, cardan shaft, diesel engine fittings |
| Ç 4120 | 20CrMo5 | 1.7218 | 4120 | Durable axle gears, shafts, turbine parts |
| Ç 8620 | 21NiCrMo2 | 1.6523 | 8620 | Medium-strength parts, gears, shafts, splined shafts, piston pins, coupling sleeves |
| Ç 8620 | 20MnCR5 | 1.7149 | 5120 | Gears and fittings spur gear, ring gear |
| 16MnCR5 | 1.7131 | 5115 | All kinds of gears, control parts, camshafts and sprocket wheels with moderate stress |
Chemical Analysis
| SAE/AISI | C | Si | Mn | P | S | Cr | Mo | Ni |
|---|---|---|---|---|---|---|---|---|
| 1020 | 0.18 - 0.25 | 0.15 - 0.35 | 0.30 - 0.60 | -- - 0.035 | -- - 0.035 | - | - | - |
| 3115 | 0.10 - 0.17 | 0.15 - 0.35 | 0.40 - 0.70 | -- - 0.035 | -- - 0.035 | 0.65 - 0.85 | - | 1.35 - 1.50 |
| 3315 | 0.10 - 0.17 | 0.15 - 0.35 | 0.40 - 0.70 | -- - 0.035 | -- - 0.035 | 0.55 - 0.95 | - | 3.25 - 3.75 |
| 4120 | 0.18 - 0.20 | 0.15 - 0.35 | 0.50 - 1.00 | -- - 0.035 | -- - 0.035 | 0.55 - 100 | 0.15 - 0.25 | - |
| 8620 | 0.17 - 0.23 | 0.15 - 0.40 | 0.60 - 0.90 | -- - 0.035 | -- - 0.035 | 0.35 - 0.65 | 0.15 - 0.25 | 0.40 - 0.70 |
| 5120 | 0.17 - 0.22 | 0.15 - 0.40 | 1.10 - 1.40 | -- - 0.035 | 0.020 - 0.035 | 1.00 - 1.30 | - | - |
| 7131 | 0.10 - 0.16 | 0.15 - 0.25 | 0.60 - 1.15 | -- - 0.035 | -- - 0.035 | 0.60 - 1.00 | - | - |
Heat Treatment Condition
| SAE/AISI | FORMING | SOFTENING | NORMALISED | CEMENTATION | TEMPERED |
|---|---|---|---|---|---|
| 1020 | 1150 - 850 °C | 650 - 700 °C | 890 - 900 °C | 900 - 950 °C | 150 - 180 °C |
| 3115 | 1150 - 850 °C | 620 - 650 °C | 850 - 880 °C | 850 - 900 °C | 170 - 200 °C |
| 3315 | 1150 - 850 °C | 610 - 650 °C | 830 - 860 °C | 850 - 900 °C | 170 - 210 °C |
| 4120 | 1050 - 850 °C | 680 - 700 °C | 850 - 900 °C | 840 - 880 °C | 150 - 180 °C |
| 8620 | 1150 - 850 °C | 650 - 700 °C | 890 - 920 °C | 850 - 900 °C | 170 - 210 °C |
| 5120 | 1150 - 850 °C | 650 - 700 °C | 890 - 920 °C | 900 - 950 °C | 170 - 210 °C |
| 7131 | 1150 - 850 °C | 650 - 700 °C | 850 - 900 °C | 900 - 950 °C | 170 - 210 °C |
Hardness and Strength Values
| SAE/AISI | SOFT ANNEALING STATE | NORMALISED STATE | CEMENTED VERSION | HARDENING CAPABILITY |
|---|---|---|---|---|
| 1020 | Max 146 HB | 42 - 55 kg/mm² Yüzey | 60 HRC | Water |
| 3115 | 175 - 220 HB | - | Surface 55 - 60 HRC | Oil |
| 3315 | Max 520 HB | - | Surface 65 HRC | Oil |
| 4120 | Max 217 HB | - | Surface 60 - 64 HRC | Oil |
| 8620 | 165 - 210 HB | - | Surface 59 - 63 HRC | - |
| 5120 | Max 217 HB | - | Surface 59 - 63 HRC | - |
| 7131 | Max 207 HB | 156 207 HB | Surface 59 - 63 HRC | - |
