Heat-resistant cast steels
Heat-resistant cast steels are cast ferrous alloys formulated for service at elevated temperatures, where resistance to softening and thermal degradation is important. They are used for furnace components, heat-treatment equipment and other high-temperature plant parts that require cast shapes and dependable mechanical performance during heating.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| SCH20X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 18 - 21 | max 2 |
| SCH22X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 24 - 27 | max 2 |
| SCH24XNb | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 24 - 27 | max 2 |
| SCH34 | — | 0.05 - 0.12 | max 1.2 | max 0.04 | max 0.03 | 19 - 23 | max 1.2 |
| SCH45 | — | 0.35 - 0.65 | max 2 | max 0.04 | max 0.03 | 13 - 19 | max 1.3 |
| SCH2X1 | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 23 - 26 | 0.5 - 1 |
| SSC19A | — | max 0.03 | max 2 | max 0.04 | max 0.04 | 17 - 21 | max 2 |
| SCH5 | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 16 - 19 | 0.5 - 1 |
| SSC21 | — | — | — | — | — | — | — |
| SCH12 | — | 0.2 - 0.4 | max 2 | max 0.04 | max 0.04 | 18 - 23 | max 2 |
| CF10 | — | 0.04 - 0.1 | max 2 | max 0.04 | max 0.04 | 18 - 21 | max 1.5 |
| SCH13X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 24 - 27 | max 2 |
| HRSC21 | — | 0.25 - 0.35 | max 1.75 | max 0.04 | max 0.04 | 23 - 27 | max 1.5 |
| SCH17 | — | 0.2 - 0.5 | max 2 | max 0.04 | max 0.04 | 26 - 30 | max 2 |
| SCH20 | — | 0.35 - 0.75 | max 2.5 | max 0.04 | max 0.04 | 17 - 21 | max 2 |
| SCH22 | — | 0.35 - 0.45 | max 1.75 | max 0.04 | max 0.04 | 23 - 27 | max 1.5 |
| SCH24X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 24 - 27 | max 2 |
| SCH33 | — | 0.25 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 23 - 25 | max 2 |
| SCH44 | — | 0.4 - 0.6 | 0.5 - 2 | max 0.04 | max 0.03 | 16 - 21 | max 1.5 |
| SCH2 | — | max 0.4 | max 2 | max 0.04 | max 0.04 | 25 - 28 | max 1 |
| SCH43 | — | max 0.1 | max 0.5 | max 0.02 | max 0.02 | 47 - 52 | max 0.5 |
| SCH4 | — | 0.2 - 0.35 | 1 - 2.5 | max 0.04 | max 0.04 | 6 - 8 | 0.5 - 1 |
| SSC14A | — | max 0.08 | max 1.5 | max 0.04 | max 0.04 | 18 - 21 | max 1.5 |
| SCH11X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 25 - 28 | max 1.5 |
| SSC23 | — | max 0.07 | max 2 | max 0.04 | max 0.04 | 19 - 22 | max 2 |
| SCH13A | — | 0.25 - 0.5 | max 1.75 | max 0.04 | max 0.04 | 23 - 26 | max 2.5 |
| CF10SMnN | — | max 0.01 | 3.5 - 4.5 | max 0.06 | max 0.03 | 16 - 18 | 7 - 9 |
| SCH16 | — | 0.2 - 0.35 | max 2.5 | max 0.04 | max 0.04 | 13 - 17 | max 2 |
| SCH19 | — | 0.2 - 0.5 | max 2 | max 0.04 | max 0.04 | 19 - 23 | max 2 |
| SCH21 | — | 0.25 - 0.35 | max 1.75 | max 0.04 | max 0.04 | 23 - 27 | max 1.5 |
| SCH24 | — | 0.35 - 0.75 | max 2 | max 0.04 | max 0.04 | 24 - 28 | max 2 |
| SCH32 | — | 0.15 - 0.35 | 1 - 2.5 | max 0.04 | max 0.03 | 19 - 21 | max 2 |
| SCH42 | — | 0.35 - 0.55 | 1 - 2.5 | max 0.04 | max 0.03 | 27 - 30 | max 1.5 |
| SCH1X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 12 - 14 | 0.5 - 1 |
| SCH47 | — | max 0.5 | max 1 | max 0.04 | max 0.03 | 25 - 30 | max 1 |
| SCH3 | — | max 0.4 | max 2 | max 0.04 | max 0.04 | 12 - 15 | max 1 |
| SSC16A | — | max 0.03 | max 1.5 | max 0.04 | max 0.04 | 17 - 21 | max 1.5 |
| SCH11 | — | max 0.4 | max 2 | max 0.04 | max 0.04 | 24 - 28 | max 1 |
| SSC18 | — | max 0.02 | max 2 | max 0.04 | max 0.04 | 23 - 27 | max 2 |
| SCH13 | — | 0.2 - 0.5 | max 2 | max 0.04 | max 0.04 | 24 - 28 | max 2 |
| CF10MC | — | — | — | — | — | — | — |
| SCH15X | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 16 - 18 | max 2 |
| SCH20XNb | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 18 - 21 | max 2 |
| SCH23 | — | 0.2 - 0.6 | max 2 | max 0.04 | max 0.04 | 28 - 32 | max 2 |
| SCH31 | — | 0.15 - 0.35 | 1 - 2.5 | max 0.04 | max 0.03 | 17 - 19 | max 2 |
| SCH41 | — | 0.35 - 0.6 | max 1 | max 0.04 | max 0.03 | 19 - 22 | max 2 |
| SCH1 | — | 0.2 - 0.4 | 1.5 - 3 | max 0.04 | max 0.04 | 12 - 15 | max 1 |
| SCH46 | — | 0.44 - 0.48 | 1 - 2 | max 0.04 | max 0.03 | 24 - 26 | max 2 |
| SCH2X2 | — | 0.3 - 0.5 | 1 - 2.5 | max 0.04 | max 0.03 | 27 - 30 | 0.5 - 1 |
| SSC13A | — | max 0.08 | max 2 | max 0.04 | max 0.04 | 18 - 21 | max 1.5 |
Standards covering this category
15Property ranges
12| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 150 | 590 | 53 |
| Re | N/mm² | 170 | 320 | 46 |
| A | % | 3 | 35 | 46 |
| A5 | % | 20 | 25 | 3 |
| Z | % | 25 | 28 | 3 |
| HB | — | 130 | 400 | 11 |
| rho | g/cm³ | 7 | 7.85 | 27 |
| E | GPa | 90 | 196 | 3 |
| alpha | 10^-6/K | 9 | 18.4 | 3 |
| lambda | W/(m·K) | 54 | 59 | 2 |
| cp | J/(kg·K) | 460 | 480 | 2 |
| rho_el | nΩ·m | 860 | 860 | 1 |
Derived from 53 grades in this category with a recorded value.
Composition range
14| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.01 | 1.8 | 80 |
| N | % | 0.08 | 0.18 | 2 |
| Si | % | 0.5 | 4.5 | 80 |
| P | % | 0.02 | 0.06 | 79 |
| S | % | 0.02 | 0.04 | 79 |
| Cr | % | 6 | 52 | 80 |
| Mn | % | 0.5 | 9 | 80 |
| Fe | % | 9.38 | 22.25 | 4 |
| Co | % | 14 | 52 | 5 |
| Ni | % | 0.5 | 69 | 78 |
| Cu | % | 0.5 | 4 | 2 |
| Nb | % | 0.5 | 2.5 | 11 |
| Mo | % | 0.15 | 3 | 69 |
| W | % | 2 | 6 | 4 |
Derived from 80 grades in this category with a recorded value.