Steels for surface hardening
Steels for surface hardening are steels designed to develop a hard, wear-resistant surface while retaining a tougher interior. They are used for gears, shafts and other machine parts where resistance to surface wear is needed together with resistance to impact and bending.
| Grade | Material no. | C | P | S | Mn | Si | Cr |
|---|---|---|---|---|---|---|---|
| C50D | 1.0586 | 0,48-0,53 | 0,03 | 0,03 | 0,50-0,80 | 0,10-0,30 | ≤0,15 |
| 1.1183 | 1.1183 | 0,33-0,39 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,35 | — |
| C45G | 1.1193 | 0,43-0,49 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,35 | — |
| C53E | 1.1210 | 0,50-0,57 | 0,035 | 0,035 | 0,60-0,90 | ≤0,40 | — |
| 1.1213 | 1.1213 | 0,50-0,57 | 0,025 | 0,035 | 0,40-0,70 | 0,15-0,35 | — |
| C50R | 1.1241 | 0,47-0,55 | 0,03 | 0,020-0,040 | 0,60-0,90 | ≤0,40 | ≤0,40 |
| C70G | 1.1249 | 0,68-0,75 | 0,025 | 0,035 | 0,20-0,35 | 0,15-0,35 | — |
| 45Cr2 | 1.7005 | 0,42-0,48 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,40 | 0,40-0,60 |
| 38Cr4 | 1.7043 | 0,34-0,40 | 0,025 | 0,035 | 0,60-0,90 | 0,15-0,40 | 0,90-1,20 |
| 1.7045 | 1.7045 | 0,38-0,44 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,40 | 0,90-1,20 |
| 1.7223 | 1.7223 | 0,38-0,44 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,40 | 0,90-1,20 |
| 49CrMo4 | 1.7238 | 0,46-0,52 | 0,025 | 0,035 | 0,50-0,80 | 0,15-0,40 | 0,90-1,20 |
| G10500 | 1.9505 | 0,48-0,55 | 0,03 | 0,05 | 0,60-0,90 | — | — |
Standards covering this category
18Property ranges
16| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 590 | 1100 | 2 |
| Re | N/mm² | 395 | 735 | 1 |
| A | % | 5 | 14 | 1 |
| A5 | % | 10 | 15 | 1 |
| Z | % | 35 | 50 | 1 |
| KCU | kJ/m² | 490 | 880 | 1 |
| HB | — | 181 | 269 | 2 |
| rho | g/cm³ | 7.66 | 7.85 | 13 |
| E | GPa | 135 | 215 | 1 |
| alpha | 10^-6/K | 11.8 | 14.6 | 1 |
| lambda | W/(m·K) | 28 | 37 | 1 |
| cp | J/(kg·K) | 466 | 664 | 1 |
| Ac1 | °C | 760 | 760 | 1 |
| Ac3 | °C | 800 | 800 | 1 |
| Ar3 | °C | 725 | 725 | 1 |
| Ar1 | °C | 680 | 680 | 1 |
Derived from 13 grades in this category with a recorded value.
Composition range
10| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.33 | 0.75 | 13 |
| Al | % | 0.01 | 0.01 | 1 |
| Si | % | 0.1 | 0.4 | 12 |
| P | % | 0.025 | 0.035 | 13 |
| S | % | 0.02 | 0.05 | 13 |
| Cr | % | 0.15 | 1.2 | 7 |
| Mn | % | 0.2 | 0.9 | 13 |
| Ni | % | 0.2 | 0.4 | 2 |
| Cu | % | 0.25 | 0.25 | 1 |
| Mo | % | 0.05 | 0.3 | 4 |
Derived from 13 grades in this category with a recorded value.
Heat treatment
3| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| normalizing | — | — | 1 |
| tempering | — | — | 1 |
| quenching | — | — | 1 |