Heat resistant steels
Heat resistant steels are alloyed materials designed to retain useful mechanical properties and resist oxidation or scaling during service at elevated temperatures. They are used for components in furnaces, boilers, heat exchangers and power-generation equipment exposed to hot gases or sustained heat.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| STR21 | — | max 0.1 | max 1.5 | max 0.04 | max 0.03 | 17 - 21 | max 1 |
| STR31 | — | 0.35 - 0.45 | 1.5 - 2.5 | max 0.04 | max 0.03 | 14 - 16 | max 0.6 |
| STR38 | — | 0.25 - 0.35 | max 1 | 0.18 - 0.25 | max 0.03 | 19 - 21 | max 1.2 |
| STR11 | — | 0.45 - 0.55 | 1 - 2 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| SUH38 | — | 0.25 - 0.35 | max 1 | 0.18 - 0.25 | max 0.03 | 19 - 21 | max 1.2 |
| SUH616 | — | 0.2 - 0.25 | max 0.5 | max 0.04 | max 0.03 | 11 - 13 | 0.5 - 1 |
| STR310 | — | max 0.25 | max 1.5 | max 0.04 | max 0.03 | 24 - 26 | max 2 |
| STR661 | — | 0.08 - 0.16 | max 1 | max 0.04 | max 0.03 | 20 - 22.5 | 1 - 2 |
| STR446 | — | max 0.2 | max 1 | max 0.04 | max 0.03 | 23 - 27 | max 1.5 |
| STR37 | — | 0.15 - 0.25 | max 1 | max 0.04 | max 0.03 | 20.5 - 22.5 | 1 - 1.6 |
| STR4 | — | 0.75 - 0.85 | 1.75 - 2.25 | max 0.03 | max 0.03 | 19 - 20.5 | 0.2 - 0.6 |
| SUH37 | — | 0.15 - 0.25 | max 1 | max 0.04 | max 0.03 | 20.5 - 22.5 | 1 - 1.6 |
| SUH600 | — | 0.15 - 0.2 | max 0.5 | max 0.04 | max 0.03 | 10 - 13 | 0.5 - 1 |
| STR309 | — | max 0.2 | max 1 | max 0.04 | max 0.03 | 22 - 24 | max 2 |
| STR660 | — | max 0.08 | max 1 | max 0.04 | max 0.03 | 13.5 - 16 | max 2 |
| STR409L | — | — | — | — | — | — | — |
| STR36 | — | 0.48 - 0.58 | max 0.35 | max 0.04 | 0.04 - 0.09 | 20 - 22 | 8 - 10 |
| STR3 | — | 0.35 - 0.45 | 1.8 - 2.5 | max 0.03 | max 0.03 | 10 - 12 | max 0.6 |
| STR616 | — | 0.2 - 0.25 | max 0.5 | max 0.04 | max 0.03 | 11 - 13 | 0.5 - 1 |
| SUH36 | — | 0.48 - 0.58 | max 0.35 | max 0.04 | 0.04 - 0.09 | 20 - 22 | 8 - 10 |
| SUH11 | — | 0.45 - 0.55 | 1 - 2 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| SUH409L | — | max 0.03 | max 1 | max 0.04 | max 0.03 | 10.5 - 11.75 | max 1 |
| STR330 | — | max 0.15 | max 1.5 | max 0.04 | max 0.03 | 14 - 17 | max 2 |
| STR409 | — | — | — | — | — | — | — |
| STR35 | — | 0.48 - 0.58 | max 0.35 | max 0.04 | max 0.03 | 20 - 22 | 8 - 10 |
| STR1 | — | 0.4 - 0.5 | 3 - 3.5 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| STR600 | — | 0.15 - 0.2 | max 0.5 | max 0.04 | max 0.03 | 10 - 13 | 0.5 - 1 |
| SUH31 | — | 0.35 - 0.45 | 1.5 - 2.5 | max 0.04 | max 0.03 | 14 - 16 | max 0.6 |
| SUH661 | — | 0.08 - 0.16 | max 1 | max 0.04 | max 0.03 | 20 - 22.5 | 1 - 2 |
| SUH21 | — | max 0.1 | max 1.5 | max 0.04 | max 0.03 | 17 - 21 | max 1 |
| X2CrAlTi18-2 | 1.4605 | ≤0,030 | ≤1,00 | 0,04 | 0,015 | 17,0-18,0 | ≤1,00 |
| 8CrSi7-7 | 1.4700 | ≤0,10 | 1,50-1,80 | 0,045 | 0,03 | 1,50-2,00 | ≤1,00 |
| X10CrSi6 | 1.4712 | ≤0,12 | 2,00-2,50 | 0,045 | 0,03 | 5,50-6,50 | ≤1,00 |
| X10CrAlSi7 | 1.4713 | ≤0,12 | 0,50-1,00 | 0,04 | 0,015 | 6,00-8,00 | ≤1,00 |
| X2CrTi12 | 1.4720 | ≤0,08 | ≤1,00 | 0,04 | 0,03 | 10,5-12,5 | ≤1,00 |
| X10CrSi13 | 1.4722 | ≤0,12 | 1,90-2,40 | 0,045 | 0,03 | 12,0-14,0 | ≤1,00 |
| 1.4724 | 1.4724 | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 12,0-14,0 | ≤1,00 |
| 1.4742 | 1.4742 | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 17,0-19,0 | ≤1,00 |
| X15CrN26 | 1.4749 | 0,15-0,20 | ≤1,00 | 0,04 | 0,015 | 26,0-29,0 | ≤1,00 |
| 1.4762 | 1.4762 | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 23,0-26,0 | ≤1,00 |
| X8Cr30 | 1.4773 | ≤0,09 | ≤1,90 | 0,03 | 0,025 | 28,8-31,2 | ≤1,40 |
| X12CrNi26-5 | 1.4820 | ≤0,14 | ≤1,40 | 0,03 | 0,025 | 24,8-27,2 | ≤1,40 |
| X15CrNiSi25-4 | 1.4821 | 0,10-0,20 | 0,80-1,50 | 0,04 | 0,015 | 24,5-26,5 | ≤2,00 |
| 1.4828 | 1.4828 | ≤0,20 | 1,50-2,50 | 0,045 | 0,015 | 19,0-21,0 | ≤2,00 |
| X12CrNi23-13 | 1.4833 | ≤0,15 | ≤1,00 | 0,045 | 0,015 | 22,0-24,0 | ≤2,00 |
| X7CrNiSiNCe21-11 | 1.4835 | 0,05-0,12 | 1,40-2,50 | 0,045 | 0,015 | 20,0-22,0 | ≤1,00 |
| X15CrNiSi25-21 | 1.4841 | ≤0,20 | 1,50-2,50 | 0,045 | 0,015 | 24,0-26,0 | ≤2,00 |
| 1.4845 | 1.4845 | ≤0,10 | ≤1,50 | 0,045 | 0,015 | 24,0-26,0 | ≤2,00 |
| X10NiCr32-20 | 1.4861 | ≤0,12 | ≤1,00 | 0,045 | 0,03 | 19,0-22,0 | ≤1,50 |
| X8NiCrSi38-18 | 1.4862 | ≤0,10 | 1,50-2,50 | 0,03 | 0,03 | 17,0-19,0 | 0,80-1,50 |
Standards covering this category
25- DIN / EN34 grades
- JIS26 grades
- KS24 grades
- UNS23 grades
- ASTM19 grades
- AISI / SAE18 grades
- AFNOR15 grades
- GOST15 grades
- GB14 grades
- PN14 grades
- BS12 grades
- UNE11 grades
- SAE AMS11 grades
- ISO10 grades
- UNI10 grades
- ČSN10 grades
- SS8 grades
- STN8 grades
- SRPS7 grades
- STAS7 grades
- MSZ4 grades
- BDS4 grades
- JUS3 grades
- ABNT NBR1 grade
- AS / NZS1 grade
Property ranges
15| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 360 | 930 | 40 |
| Re | N/mm² | 175 | 735 | 39 |
| A | % | 8 | 45 | 34 |
| A5 | % | 15 | 40 | 9 |
| Z | % | 15 | 60 | 25 |
| aK | J/cm² | 10 | 20 | 4 |
| HB | — | 162 | 341 | 47 |
| HRB | — | 80 | 100 | 16 |
| HV | — | 175 | 261 | 16 |
| rho | g/cm³ | 7.39 | 8.4 | 34 |
| E | GPa | 144 | 207 | 3 |
| alpha | 10^-6/K | 10 | 19 | 5 |
| lambda | W/(m·K) | 13.8 | 31 | 4 |
| cp | J/(kg·K) | 538 | 538 | 2 |
| rho_el | nΩ·m | 946 | 1242 | 2 |
Derived from 47 grades in this category with a recorded value.
Composition range
19| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.001 | 0.01 | 4 |
| C | % | 0.03 | 0.85 | 62 |
| N | % | 0.05 | 0.5 | 22 |
| Al | % | 0.025 | 4 | 13 |
| Si | % | 0.3 | 3.5 | 62 |
| P | % | 0.02 | 0.25 | 60 |
| S | % | 0.01 | 0.09 | 60 |
| Ti | % | 0.15 | 2.35 | 8 |
| V | % | 0.1 | 0.5 | 5 |
| Cr | % | 1.5 | 31.2 | 61 |
| Mn | % | 0.2 | 10 | 61 |
| Fe | % | 5 | 45.64 | 6 |
| Co | % | 1 | 21 | 5 |
| Ni | % | 0.5 | 68.5 | 51 |
| Cu | % | 0.3 | 0.5 | 8 |
| Nb | % | 0.2 | 4.2 | 9 |
| Mo | % | 0.3 | 18 | 15 |
| Ce | % | 0.03 | 0.1 | 3 |
| W | % | 0.75 | 3 | 6 |
Derived from 62 grades in this category with a recorded value.