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ALLOY STEELS
Tempered Steel
Tempered Steel
Tempered steels are one of the types of steel that have been heat treated below the melting point, which is around 1370 ºC, and then cooled to improve their physical properties. It is used to increase the strength, hardness and roughness of the steel. When steel is heated and cooled, its physical properties change.
To treat steel, the steel is heated to a certain temperature below its melting point, then the steel is cooled.
Specifications :
- Steel becomes harder through heating and cooling processes.
- It can withstand more force without succumbing to deformation.
- It is highly resistant to wear and tear.
- It is a very good choice for high stress applications.
Usage of Areas :
Tempered steels are a high strength, low alloy structural steel used for a variety of construction and mining uses. Some of the applications of reclamation steel include: storage tanks, bridges and high-rise buildings, excavator, low-load trailers and loader buckets, machine apparatus, etc.
Technical Details
| MKE Norm | DIN NO | TOOL NO. | SAE AISI | GENERAL AREAS OF USE |
|---|---|---|---|---|
| Ç 5140 | 41Cr4 | 1.7035 | 5140 | High-strength machine tools, crankshafts, lave hardening tools, axles, axle bearings, control parts |
| Ç 4140 | 42CrMo4 | 1.7225 | 4140 | Machine parts requiring high strength, gear wheels, pawns, connecting rods, crankshafts, axle shafts, wheels |
| Ç 3130 | 28NiCr6 | 1.5714 | 3130 | Auto shafts, parts requiring moderate strength, gears, crankshafts, connecting rods, bolts, pins, axles |
| Ç 4130 | 34CrMo4 | 1.7220 | 4130 | Machine parts, pallets, pipe coils, auto motion parts, auto axle shafts, crankshafts, wheels, etc. |
| Ç 4150 | 50CrMo4 | 1.7228 | 4150 | Machine and auto parts, moulds, augers, shafts, connections, control parts requiring high strength |
| Ç 8640 | 40NiCrMo2 | 1.6546 | 8640 | Propeller shafts, shafts, axles, connecting rods, camshafts, heavy duty components |
| Ç 4340 | 34CrNiMo6 | 1.6582 | 4340 | Machine parts requiring high strength, shaft, shaft, bolt gear, crankshafts, eccentric shafts, transmission parts |
| Ç 6150 | 50Crv4 | 1.8159 | 6150 | Gears and fittings, large gears, shafts, impellers, drill rods, parts with high body toughness |
Chemical Analysis
| SAE/AISI | C | Si | Mn | P | S | Cr | Mo | Ni | V |
|---|---|---|---|---|---|---|---|---|---|
| 5240 | 0.38 - 0.45 | 0.15 - 0.40 | 0.50 - 0.80 | -- - 0.035 | -- - 0.035 | 0.90 - 1.20 | - | - | - |
| 4140 | 0.38 - 0.45 | 0.15 - 0.40 | 0.50 - 0.80 | -- - 0.35 | -- - 0.035 | 0.90 - 1.20 | 0.15 - 0.30 | - | - |
| 3130 | 0.25 - 0.32 | 0.15 - 0.35 | 0.50 - 0.90 | -- - 0.040 | -- - 0.040 | 0.40 - 0.60 | - | 1.25 - 1.75 | - |
| 4130 | 0.30 - 0.37 | 0.15 - 0.40 | 0.50 - 0.80 | -- - 0.035 | -- - 0.035 | 0.90 - 1.20 | 0.15 - 0.30 | - | - |
| 4150 | 0.46 - 0.54 | 0.15 - 0.40 | 0.50 - 0.80 | -- - 0.035 | -- - 0.035 | 0.90 - 1.20 | 0.15 - 0.30 | - | - |
| 8640 | 0.35 - 0.44 | 0.15 - 0.35 | 0.70 - 1.00 | -- - 0.040 | -- - 0.040 | 0.40 - 0.60 | 0.15 - 0.25 | 0.40 - 0.70 | - |
| 4340 | 0.30 - 0.38 | 0.15 - 0.40 | 0.40 - 0.70 | -- - 0.035 | -- - 0.035 | 1.40 - 1.70 | 0.15 - 0.30 | 1.40 - 1.70 | - |
| 6150 | 0.47 - 0.55 | 0.15 - 0.40 | 0.70 - 1.10 | -- - 0.035 | -- - 0.035 | 0.90 - 1.20 | - | - | 0.10 - 0.20 |
Heat Treatment Condition
| SAE/AISI | FORMING | SOFTENING | NORMALISED | CEMENTATION | TEMPERED |
|---|---|---|---|---|---|
| 5140 | 1050 - 850 °C | 680 - 720 °C | 850 - 880 °C | 820 - 850 (water-oil) °C | 530 - 670 °C |
| 4140 | 1050 - 850 °C | 680 - 720 °C | 850 - 880 °C | 820 - 850 (water-oil) °C | 530 - 670 °C |
| 3130 | 1150 - 850 °C | 630 - 700 °C | 800 - 820 °C | 800 - 850 (oil) °C | 550 - 630 °C |
| 4130 | 1050 - 850 °C | 680 - 720 °C | 850 - 890 °C | 820 - 870 (water-oil) °C | 530 - 670 °C |
| 4150 | 1050 - 850 °C | 680 - 720 °C | 840 - 880 °C | 830 - 860 (oil) °C | 540 - 680 °C |
| 8640 | 1050 - 850 °C | 870 - 830 °C | 880 - 930 °C | 830 - 860 (water-oil) °C | 540 - 680 °C |
| 4340 | 1050 - 850 °C | 650 - 670 °C | 870 - 900 °C | 830 - 860 (water-oil) °C | 540 - 680 °C |
| 6150 | 1050 - 850 °C | 680 - 720 °C | 840 - 880 °C | 820 - 860 (water-oil) °C | 540 - 680 °C |
Hardness and Strength Values
| SAE/AISI | SOFT ANNEALING STATE | NORMALISED VERSION | IMPROVED VERSION | INDEX SURFACE HARDNESS |
|---|---|---|---|---|
| 5140 | Max 217 HB | 80 - 85 kg/mm² | 90 - 110 kg/mm² | 54 HRC |
| 4140 | Max 220 HB | 85 - 100 kg/mm² | 100 - 120 kg/mm² | 54 - 60 HRC |
| 3130 | Max 217 HB | 70 - 80 kg/mm² | 75 - 120 kg/mm² | 54 HRC |
| 4130 | Max 217 HB | 75 - 80 kg/mm² | 90 - 110 kg/mm² | 54 HRC |
| 4150 | 80 kg/mm² 235HB | 100 - 125 kg/mm² | 110 - 135 kg/mm² | 57 - 62 HRC |
| 4340 | 220 HB | 235 HB | 110 - 130 kg/mm² | 57 - 60 HRC |
| 8640 | 70 kg/mm² 210HB | 80 - 110 kg/mm² | 100 - 105 kg/mm² | 54 - 60 HRC |
| 6150 | Max 220 HB | 85 - 110 kg/mm² | 110 - 120 kg/mm² | 54 - 60 HRC |
