What Is an EN 1092-1 Carbon Steel Flange?
An EN 1092-1 carbon steel flange is a European standard pipe flange manufactured in accordance with EN 1092-1, the primary flange standard used throughout Europe. These flanges are widely applied in oil & gas, petrochemical, water treatment, power generation, shipbuilding, and general industrial piping systems.
Unlike ASME B16.5 flanges, EN 1092-1 flanges are designated by PN pressure ratings (PN6, PN10, PN16, PN25, PN40, etc.) and DN nominal sizes, making them the preferred choice for European engineering projects.
Common Carbon Steel Materials for EN 1092-1 Flanges
The material selection depends on operating temperature, pressure, and service conditions.
| Grado del material | Material No. | Typical Application | ASTM Equivalent (Approx.) |
| P235GH | 1.0345 | Water, HVAC, low-pressure piping | — |
| P245GH | 1.0352 | Pressure vessels | ASTM A105 (Approx.) |
| P250GH | 1.046 | Oil & Gas, Petrochemical | ASTM A105 / A105N |
| C22.8 | 1.046 | Forged carbon steel flanges | ASTM A105 |
| P280GH | 1.0426 | Higher-temperature service | ASTM A516 Gr.70 (Approx.) |
| P355NL1 | 1.0566 | Low-temperature piping | ASTM A350 LF2 CL1 |
| P355NL2 | 1.5638 | Severe low-temperature service | ASTM A350 LF2 CL2 |
| 16Mo3 | 1.5415 | Medium-temperature piping | ASTM A182 F1 |
| 13CrMo4-5 | 1.7335 | High-temperature steam | ASTM A182 F11 |
| 10CrMo9-10 | 1.738 | High-pressure steam | ASTM A182 F22 |
Common European Carbon Steel Flange Materials
1. P250GH (1.0460)
P250GH is the most widely used carbon steel flange material in Europe.
Typical applications include:
- Petróleo y gas
- Petrochemical plants
- Water treatment
- Refineries
- Pressure piping systems
Ventajas:
- Excelente soldabilidad
- Good mechanical strength
- Suitable for PED-certified equipment
2. C22.8 (1.0460)
C22.8 is a forged carbon steel material widely specified by German engineering companies.
It is commonly used for:
- Forged weld neck flanges
- Blind flanges
- Pressure equipment
- Tuberías industriales pesadas
Many German RFQs simply specify: Material: C22.8
3. P235GH
P235GH is mainly used in:
- PN10 piping
- PN16 piping
- Sistemas HVAC
- Water supply
- Low-pressure industrial services
Compared with P250GH, it offers lower strength but excellent fabrication characteristics.
European Low-Temperature Flange Materials
For cryogenic or low-temperature service, standard carbon steel is usually replaced with normalized low-temperature steels.
| Material | Material No. | Typical Service | Approx. ASTM Equivalent |
| P355NL1 | 1.0566 | Down to approximately -50°C | ASTM A350 LF2 CL1 |
| P355NL2 | 1.5638 | More severe low-temperature service | ASTM A350 LF2 CL2 |
Typical applications include:
- LNG terminals
- LPG facilities
- Cryogenic storage tanks
- Low-temperature process piping
EN 1092-1 Flange Types
The EN 1092-1 standard defines several flange designs.
| Tipo de brida | Descripción |
| Type 01 | Plate Flange |
| Type 02 | Loose Plate Flange |
| Type 05 | Brida ciega |
| Type 11 | Brida de cuello de soldadura |
| Type 12 | Hubbed Slip-On Flange |
| Tipo 13 | Brida roscada |
Among these, Type 11 Weld Neck Flanges are the most commonly used in high-pressure piping systems.
PN Pressure Ratings
Unlike ASME flanges that use pressure classes, EN 1092-1 flanges use PN ratings.
| PN Rating | Maximum Design Pressure* |
| PN6 | 6 bar |
| PN10 | 10 bar |
| PN16 | 16 bar |
| PN25 | 25 bar |
| PN40 | 40 bar |
| PN63 | 63 bar |
| PN100 | 100 bar |
*Actual allowable pressure depends on material and operating temperature.
Certifications Commonly Required for European Projects
European EPC projects usually require one or more of the following certifications:
| Certification | Objetivo |
| EN 10204 Type 3.1 | Mill Test Certificate |
| EN 10204 Type 3.2 | Third-party witnessed inspection |
| PED 2014/68/EU | Pressure Equipment Directive compliance |
| AD 2000 W0 | German pressure equipment approval |
| PMI | Positive Material Identification |
| UT / PT / MT | Non-destructive examination |
| NACE MR0175 / ISO 15156 | Sour service applications (when specified) |
FAQs About European Carbon Steel Flange
P250GH and ASTM A105 are widely considered approximate equivalents for many industrial applications. However, they are produced to different standards and are not directly interchangeable without reviewing the applicable project specifications and mechanical property requirements.
P250GH (1.0460) is the most commonly specified material across European oil & gas, petrochemical, and industrial projects.
EN 1092-1 uses DN nominal sizes and PN pressure ratings, while ASME B16.5 uses NPS nominal sizes and Class pressure ratings. They are different standards with different dimensions and are generally not interchangeable without engineering verification.
Full-service supplier of EN 1092-1 flanges for all your requirements
SSM offers significant product advantages in the manufacture of EN-1092-1 flanges. Whether it’s quality or price – we will meet your requirements.
European Standard Carbon Steel Flanges for Industrial Piping Systems
SSMALLOYS manufactures and supplies EN 1092-1 carbon steel flanges for the European, Middle Eastern, and global industrial markets. Our products are available in P250GH, C22.8, P235GH, P355NL1, and other pressure vessel steel grades, meeting the requirements of EN 1092-1, PED 2014/68/EU, y EN 10204 certification.
From standard PN16 flanges to high-pressure PN100 forged flanges, we provide reliable flange solutions for oil & gas, petrochemical, power generation, water treatment, shipbuilding, and industrial piping systems.
Looking for a Reliable EN 1092-1 Carbon Steel Flange Supplier?
SSMALLOYS provides high-quality forged carbon steel flanges with fast delivery, competitive pricing, and complete certification.
Contact our engineering sales team today for a quotation or technical support.
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