Valve steels
Valve steels are alloy steels developed for valve components exposed to heat, pressure, wear, and corrosive service conditions. They are characterised by combinations of strength, hardness, toughness, and resistance to oxidation or corrosion suited to the operating environment. Typical uses include engine valves and industrial valve parts where reliable performance and dimensional stability are required.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| 45SiCr16-11 | 1.4704 | 0,40-0,50 | 3,50-4,50 | 0,045 | 0,03 | 2,50-3,00 | ≤1,00 |
| 1.4718 | 1.4718 | 0,40-0,50 | 2,70-3,30 | 0,04 | 0,03 | 8,00-10,0 | ≤0,60 |
| X40CrSiMo10-2 | 1.4731 | 0,35-0,45 | 2,00-3,00 | 0,04 | 0,03 | 9,50-11,5 | ≤0,80 |
| X80CrSiMoW15-2 | 1.4732 | 0,75-0,85 | 1,80-2,20 | 0,04 | 0,03 | 14,0-16,0 | ≤0,80 |
| X85CrMoV18-2 | 1.4748 | 0,80-0,90 | ≤1,00 | 0,04 | 0,03 | 16,5-18,5 | ≤1,50 |
| X60CrMnMoVNbN21-10 | 1.4785 | 0,57-0,65 | ≤0,25 | 0,05 | 0,025 | 20,0-22,0 | 9,50-11,5 |
| X33CrNiMnN23-8 | 1.4866 | 0,28-0,38 | 0,50-1,00 | 0,045 | 0,03 | 22,0-24,0 | 1,50-3,50 |
| X53CrMnNiNbN21-9 | 1.4870 | 0,48-0,58 | ≤0,45 | 0,045 | 0,03 | 20,0-22,0 | 8,00-10,0 |
| 1.4871 | 1.4871 | 0,48-0,58 | ≤0,25 | 0,045 | 0,03 | 20,0-22,0 | 8,00-10,0 |
| X45CrNiW18-9 | 1.4873 | 0,40-0,50 | 2,00-3,00 | 0,045 | 0,03 | 17,0-19,0 | 0,80-1,50 |
| X55CrMnNiN20-8 | 1.4875 | 0,50-0,60 | ≤0,25 | 0,045 | 0,03 | 19,5-21,5 | 7,00-10,0 |
| X70CrMnNiN21-6 | 1.4881 | 0,65-0,75 | ≤0,80 | 0,05 | 0,02-0,06 | 20,0-22,0 | 5,50-7,00 |
| X50CrMnNiNbN21-9 | 1.4882 | 0,45-0,55 | ≤0,45 | 0,045 | 0,03 | 20,0-22,0 | 8,00-10,0 |
| NiFe25Cr20NbTi | 2.4955 | 0,04-0,10 | ≤1,00 | 0,03 | 0,015 | 18,0-21,0 | ≤1,00 |
Standards covering this category
18Property ranges
19| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 740 | 930 | 3 |
| Re | N/mm² | 440 | 735 | 3 |
| A | % | 8 | 15 | 3 |
| A5 | % | 10 | 15 | 2 |
| Z | % | 35 | 40 | 2 |
| aK | J/cm² | 20 | 20 | 1 |
| KCU | kJ/m² | 200 | 200 | 1 |
| HB | — | 197 | 355 | 4 |
| HRC | — | 25 | 30 | 6 |
| rho | g/cm³ | 7.43 | 7.85 | 14 |
| E | GPa | 129 | 214 | 1 |
| alpha | 10^-6/K | 10 | 14.3 | 2 |
| lambda | W/(m·K) | 17 | 26 | 2 |
| cp | J/(kg·K) | 532 | 586 | 1 |
| rho_el | nΩ·m | 906 | 1216 | 1 |
| Ac1 | °C | 810 | 900 | 2 |
| Ac3 | °C | 950 | 970 | 2 |
| Ar3 | °C | 845 | 970 | 2 |
| Ar1 | °C | 700 | 810 | 2 |
Derived from 14 grades in this category with a recorded value.
Composition range
16| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.008 | 0.008 | 1 |
| C | % | 0.04 | 0.9 | 14 |
| N | % | 0.18 | 0.6 | 7 |
| Al | % | 0.3 | 1 | 1 |
| Si | % | 0.25 | 4.5 | 14 |
| P | % | 0.03 | 0.05 | 14 |
| S | % | 0.015 | 0.06 | 14 |
| Ti | % | 1 | 2 | 1 |
| V | % | 0.3 | 1 | 2 |
| Cr | % | 2.5 | 24 | 14 |
| Mn | % | 0.6 | 11.5 | 14 |
| Fe | % | 23 | 28 | 1 |
| Ni | % | 0.5 | 56.615 | 12 |
| Nb | % | 1 | 3 | 4 |
| Mo | % | 0.5 | 2.5 | 5 |
| W | % | 0.5 | 1.5 | 4 |
Derived from 14 grades in this category with a recorded value.