Hydrogen resistant steels
Hydrogen resistant steels are steels designed to withstand hydrogen-related damage, including hydrogen embrittlement and hydrogen attack. They are used for pressure vessels, piping and process equipment exposed to hydrogen-containing environments, where resistance to hydrogen ingress and loss of toughness is important.
| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| 26CrMo7 | 1.7259 | 0,22-0,30 | 0,15-0,35 | 0,035 | 0,035 | 1,50-1,80 | 0,50-0,70 |
| 24CrMo10 | 1.7273 | 0,20-0,28 | 0,15-0,35 | 0,035 | 0,035 | 2,30-2,60 | 0,50-0,80 |
| 10CrMo11 | 1.7276 | 0,08-0,12 | 0,15-0,35 | 0,035 | 0,035 | 2,70-3,00 | 0,30-0,50 |
| 16CrMo9-3 | 1.7281 | 0,12-0,20 | 0,15-0,35 | 0,035 | 0,035 | 2,00-2,50 | 0,30-0,50 |
| 1.7362 | 1.7362 | 0,10-0,15 | ≤0,50 | 0,02 | 0,005 | 4,00-6,00 | 0,30-0,60 |
| X11CrMo9-1 | 1.7386 | 0,08-0,15 | 0,25-1,00 | 0,025 | 0,02 | 8,00-10,0 | 0,30-0,60 |
| 17CrMoV10 | 1.7766 | 0,15-0,20 | 0,15-0,35 | 0,035 | 0,035 | 2,70-3,00 | 0,30-0,50 |
| 20CrMoV13-5-5 | 1.7779 | 0,17-0,23 | 0,15-0,35 | 0,025 | 0,02 | 3,00-3,30 | 0,30-0,50 |
Standards covering this category
14Property ranges
17| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| ReH | N/mm² | 300 | 320 | 1 |
| Rm | N/mm² | 390 | 690 | 1 |
| Re | N/mm² | 215 | 235 | 1 |
| A5 | % | 18 | 22 | 1 |
| Z | % | 50 | 50 | 1 |
| KCU | kJ/m² | 1180 | 1180 | 1 |
| HB | — | 170 | 337 | 1 |
| rho | g/cm³ | 7.58 | 7.85 | 8 |
| E | GPa | 102 | 211 | 1 |
| alpha | 10^-6/K | 11.3 | 12.5 | 1 |
| lambda | W/(m·K) | 33 | 37 | 1 |
| cp | J/(kg·K) | 483 | 483 | 1 |
| rho_el | nΩ·m | 430 | 430 | 1 |
| Ac1 | °C | 815 | 815 | 1 |
| Ac3 | °C | 848 | 848 | 1 |
| Ar3 | °C | 775 | 775 | 1 |
| Ar1 | °C | 718 | 718 | 1 |
Derived from 8 grades in this category with a recorded value.
Composition range
12| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| C | % | 0.08 | 0.3 | 8 |
| N | % | 0.012 | 0.012 | 1 |
| Al | % | 0.04 | 0.04 | 2 |
| Si | % | 0.15 | 1 | 8 |
| P | % | 0.02 | 0.035 | 8 |
| S | % | 0.005 | 0.035 | 8 |
| V | % | 0.1 | 0.55 | 2 |
| Cr | % | 1.5 | 10 | 8 |
| Mn | % | 0.3 | 0.8 | 8 |
| Ni | % | 0.3 | 0.8 | 3 |
| Cu | % | 0.3 | 0.3 | 3 |
| Mo | % | 0.2 | 1.1 | 8 |
Derived from 8 grades in this category with a recorded value.
Heat treatment
2| Operation | MinTemperature (°C) | MaxTemperature (°C) | Grades |
|---|---|---|---|
| ageing | 485 | 570 | 1 |
| quenching | 1150 | 1180 | 1 |