Unalloyed tool steels / carbon steels
Unalloyed tool steels are carbon steels whose working properties are developed primarily through carbon content and heat treatment. They are characterised by high attainable hardness and wear resistance, and are used for cutting tools, punches, dies, gauges and other tooling where edge retention and resistance to deformation are important.
| Grade | Material no. | C | Si | P | S | Mn | Cr |
|---|---|---|---|---|---|---|---|
| SK90 | — | 0.85 - 0.95 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC140 | — | 1.3 - 1.5 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC90 | — | 0.85 - 0.95 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC70 | — | 0.65 - 0.75 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK95 | — | 0.9 - 1 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK60 | — | 0.55 - 0.65 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC95 | — | 0.9 - 1 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC75 | — | 0.7 - 0.8 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK120 | — | 1.15 - 1.25 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK70 | — | 0.65 - 0.75 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC105 | — | 1 - 1.1 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC80 | — | 0.75 - 0.85 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC60 | — | 0.55 - 0.65 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK140 | — | 1.3 - 1.5 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| SK80 | — | 0.75 - 0.85 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC120 | — | 1.15 - 1.25 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC85 | — | 0.8 - 0.9 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| STC65 | — | 0.6 - 0.7 | 0.1 - 0.35 | max 0.03 | max 0.03 | 0.1 - 0.5 | max 0.3 |
| 1.1620 | 1.1520 | 0,65-0,75 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,40 | — |
| C80U | 1.1525 | 0,75-0,85 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,40 | — |
| C105W2 | 1.1535 | 0,85-0,95 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,40 | — |
| 1.1545 | 1.1545 | 1,00-1,10 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,40 | — |
| C110U | 1.1554 | 1,00-1,10 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C110W1 | 1.1555 | 1,15-1,25 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,40 | — |
| C125U | 1.1563 | 1,20-1,35 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C135U | 1.1573 | 1,30-1,45 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C70W2 | 1.1620 | 0,65-0,74 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C80W2 | 1.1625 | 0,75-0,85 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C105W2 | 1.1645 | 1,00-1,10 | 0,10-0,30 | 0,03 | 0,03 | 0,10-0,35 | — |
| C45U | 1.1730 | 0,42-0,50 | 0,15-0,40 | 0,03 | 0,03 | 0,60-0,80 | — |
| C60U | 1.1740 | 0,55-0,65 | 0,15-0,40 | 0,035 | 0,035 | 0,60-0,80 | — |
| C67W | 1.1744 | 0,64-0,72 | 0,15-0,40 | 0,035 | 0,035 | 0,60-0,80 | — |
| C75W | 1.1750 | 0,72-0,82 | 0,15-0,40 | 0,035 | 0,035 | 0,60-0,80 | — |
| C55W | 1.1820 | 0,50-0,58 | ≤0,15 | 0,03 | 0,03 | 0,30-0,50 | — |
| C85U | 1.1830 | 0,80-0,90 | 0,25-0,40 | 0,025 | 0,02 | 0,50-0,70 | — |
Standards covering this category
22Property ranges
16| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 410 | 1420 | 6 |
| Re | N/mm² | 325 | 1230 | 3 |
| A5 | % | 10 | 28 | 5 |
| Z | % | 34 | 50 | 3 |
| KCU | kJ/m² | 270 | 270 | 1 |
| HB | — | 183 | 217 | 26 |
| HRC | — | 55 | 63 | 10 |
| rho | g/cm³ | 7.489 | 7.852 | 17 |
| E | GPa | 166 | 209 | 2 |
| alpha | 10^-6/K | 10.5 | 16.8 | 3 |
| lambda | W/(m·K) | 24 | 49 | 4 |
| cp | J/(kg·K) | 469 | 970 | 3 |
| rho_el | nΩ·m | 130 | 1196 | 4 |
| Ac1 | °C | 720 | 730 | 5 |
| Ac3 | °C | 770 | 830 | 4 |
| Ar1 | °C | 700 | 700 | 5 |
Derived from 26 grades in this category with a recorded value.
Composition range
8| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.42 | 1.5 | 35 |
| Si | % | 0.1 | 0.4 | 35 |
| P | % | 0.025 | 0.035 | 35 |
| S | % | 0.02 | 0.035 | 35 |
| Cr | % | 0.3 | 0.3 | 18 |
| Mn | % | 0.1 | 0.8 | 35 |
| Ni | % | 0.25 | 0.25 | 18 |
| Cu | % | 0.25 | 0.25 | 18 |
Derived from 35 grades in this category with a recorded value.