C22.8 (Material No. 1.0460) is a non-alloy carbon steel forging grade widely used in Europe for manufacturing pressure-retaining components, including EN 1092-1 forged carbon steel flanges, valves, pressure vessel parts, and pipe fittings. It offers excellent forgeability, weldability, and mechanical strength, making it one of the preferred materials for pressure piping systems in accordance with European standards.
C22.8 is commonly specified by German engineering companies and EPC contractors and is widely used in the oil & gas, petrochemical, power generation, shipbuilding, and water treatment industries. It is typically supplied in the normalized condition to ensure stable mechanical properties and compliance with pressure equipment requirements.
C22.8 (1.0460) Chemical Composition
| Élément | Contenu (%) |
| Carbone (C) | ≤ 0.22 |
| Silicium (Si) | ≤ 0,40 |
| Manganèse (Mn) | 0.60 – 1.50 |
| Phosphore (P) | ≤ 0.025 |
| Soufre (S) | ≤ 0,020 |
| Chromium (Cr)* | ≤ 0,30 |
| Nickel (Ni)* | ≤ 0,30 |
| Molybdenum (Mo)* | ≤ 0,08 |
| Copper (Cu)* | ≤ 0,30 |
Note: Chromium, Nickel, Molybdenum, and Copper are generally residual elements rather than intentionally added alloying elements. Actual chemical limits may vary slightly depending on the applicable forging standard and customer specifications.
Propriétés mécaniques
(Typical values for normalized forgings. Actual requirements may vary according to section thickness and applicable standard.)
| Propriété | Valeur |
| Résistance à la traction (Rm) | 410–530 MPa |
| Yield Strength (ReH) | ≥250 MPa |
| Elongation (A) | ≥22% |
| Impact Test | Available upon project requirement |
| Dureté | Typically ≤170 HB |
Propriétés physiques
| Propriété | Valeur |
| Densité | 7,85 g/cm³ |
| Point de fusion | Approximately 1,510°C |
| Thermal Conductivity (20°C) | Approximately 50 W/m·K |
| Module d'élasticité | 210 GPa |
| coefficient de Poisson | 0.3 |
Traitement thermique
C22.8 forgings are commonly supplied in the following condition:
- Normalized (N)
Depending on project specifications, additional heat treatment such as stress relieving may also be performed after machining or welding.
Applications typiques
C22.8 is widely used for manufacturing:
- EN 1092-1 Weld Neck Flanges
- EN 1092-1 Blind Flanges
- Brides à emboîter
- Pressure Vessel Forgings
- Valve Bodies
- Valve Bonnets
- Forged Rings
- Pressure Piping Components
- Petrochemical Equipment
Equivalent Materials (Approximate)
| European | ASTM/ASME (Approximate) | Remarques |
| C22.8 (1.0460) | ASTM A105 / ASTM A105N | Similar forging applications |
| C22.8 (1.0460) | P250GH (1.0460) | Same material number, different product standards |
Important: Although C22.8 and P250GH both use Material No. 1.0460, they are defined under different European product standards. C22.8 is a forging grade, while P250GH is primarily specified as a pressure vessel steel grade. Material substitution should always be confirmed against project specifications.
Advantages of C22.8
- Excellent forging performance
- Bonne soudabilité
- Stable mechanical properties after normalizing
- Suitable for pressure-retaining equipment
- Excellent machinability
- Cost-effective compared with alloy steel forgings
- Widely accepted in European EPC projects
Typical Standards
C22.8 forgings are commonly manufactured in accordance with:
- EN 10222-2
- EN 1092-1 (Flanges)
- PED 2014/68/EU
- EN 10204 Type 3.1 / 3.2
FAQs About C22.8 material
C22.8 is a European carbon steel forging grade (Material No. 1.0460) widely used for manufacturing pressure-retaining components such as forged flanges, valve bodies, and pressure vessel parts.
C22.8 and ASTM A105 are widely regarded as approximately equivalent for forged pressure components. However, they are manufactured according to different standards and should not be considered directly interchangeable without verifying the applicable design code and project requirements.
Although both share the same material number (1.0460), C22.8 is specified as a forging material under EN 10222-2, whereas P250GH is a pressure equipment steel grade used in standards such as EN 10028-2. The selection depends on the product form and applicable specification.
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