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AFNOR 2.4955 Details
Valve steels and alloys for internal combustion engines
AFNOR 2.4955 Standard Download
2.4955 Datasheet
AFNOR 2.4955| Category | Type | Grade | Designations |
|---|---|---|---|
| Grades | Stainless Steels | 2.4955 | France - AFNOR , NF EN 10090 - Valve steels and alloys for internal combustion engines |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.04 | 0.10 | ||
| Si | - | 1.00 | ||
| Mn | - | 1.00 | ||
| P | - | 0.030 | ||
| S | - | 0.015 | ||
| Cr | 18.00 | 21.00 | ||
| Ni | - | remaining | ||
| Mo | - | - | ||
| Al | 0.30 | 1.00 | ||
| Ti | 1.00 | 2.00 | ||
| Fe | 23.00 | 28.00 | ||
| B | - | 0.008 | ||
| Nb+Ta | 1.00 | 2.00 |
| Proof strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Impact energy KV (J) |
Elongation at fracture A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 147 (≥) | 242 (≥) | 42 | 34 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 |
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 594 (≥) | 358 (≥) | 33 | 41 | 33 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 242 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 195 | 987 | 143 |
| Product type | Products | Dimension | Processes | Deliver Status |
|---|---|---|---|---|
| Plates / Sheets | Plates / Sheets | 0.08-200mm(T)*W*L | Forging, hot rolling and cold rolling | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Steel Bar | Round Bar, Flat Bar, Square Bar | Φ8-1200mm*L | Forging, hot rolling and cold rolling, Cast | Black, Rough Turning, Shot Blasting, |
| Coil / Strip | Steel Coil /Steel Strip | 0.03-16.0x1200mm | Cold-Rolled & Hot-Rolled | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Pipes / Tubes | Seamless Pipes/Tubes, Welded Pipes/Tubes | OD:6-219mm x WT:0.5-20.0mm | Hot extrusion, Cold Drawn, Welded | Annealed, Solution and Aging, Q+T, ACID-WASHED |
| Grade | Standard | Country | Application |
|---|---|---|---|
| NiFe25Cr20NbTi | AFNOR | France | Valve steels and alloys for internal combustion engines |
| 2.4955 | AFNOR | France | Valve steels and alloys for internal combustion engines |
| NiFe25Cr20NbTi | ISO | International | Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines |