EN 1092-1 Type 11 P250GH Weld Neck Flange | 1.0460
EN 1092-1 Type 11 P250GH flanges are forged weld-neck steel flanges for PN-rated pressure piping systems.P250GH, material number 1.0460, is a non-alloy pressure-purpose steel with specified elevated-temperature properties and is commonly supplied in the normalized condition.
We manufacture and supply EN 1092-1 Type 11 P250GH weld neck flanges in B1 and B2 raised-face configurations, with PN ratings, customized weld ends and EN 10204 3.1 material certification.
The former German designation C22.8 is still frequently used in commercial enquiries for P250GH / 1.0460.
EN 1092-1 Type 11 P250GH Flange Quick Specification
| Item | Specification |
|---|---|
| Flange Standard | EN 1092-1 |
| Flange Type | Type 11 – Weld Neck |
| Material | P250GH |
| Material Number | 1.0460 |
| Legacy DIN Designation | C22.8 |
| Material Standard | EN 10222-2 |
| Delivery Condition | Normalized, +N |
| Facing | B1 / B2 Raised Face |
| Typical DN Supply | DN10–DN600 |
| Typical PN Supply | PN6 / 10 / 16 / 25 / 40 / 63 / 100 |
| Connection | Butt Weld |
| Certification | EN 10204 Type 3.1 |
Other DN, PN, bore and weld-end combinations can be evaluated according to EN 1092-1 and project requirements.
What Is EN 1092-1 Type 11?
EN 1092-1 Type 11 is a weld-neck steel flange designed to be joined to pipe by butt welding.
The flange has an extended tapered neck that provides a gradual transition from the flange body to the pipe.
Typical advantages include:
- Strong butt-welded connection
- Good stress distribution
- Suitable for pressure and temperature cycling
- Reliable use in industrial process piping
- Available in multiple PN ratings
- Various sealing-face configurations
For procurement, a Type 11 flange should normally be identified by:
Standard + Type + Facing + DN + PN + Material + Bore/Wall Thickness when required
Example:
EN 1092-1 Type 11 / B1 / DN100 / PN40 / P250GH / 1.0460
What Is P250GH / 1.0460 / C22.8?
P250GH / 1.0460 is a non-alloy quality steel for pressure purposes with specified elevated-temperature properties.
The designations have different functions:
- P250GH – current European symbolic steel designation
- 1.0460 – European material number
- C22.8 – former DIN 17243 designation
C22.8 therefore remains a useful legacy search and procurement term, but current EN documentation should primarily specify:
P250GH / 1.0460
P250GH forgings for pressure purposes are specified under EN 10222-2.
EN 1092-1 vs EN 10222-2
These two standards perform different functions and should not be treated as interchangeable.
| Standard | Main Function |
|---|---|
| EN 1092-1 | Flange type, dimensions, facing, tolerances, PN designation and pressure/temperature ratings |
| EN 10222-2 | Material and technical delivery requirements for P250GH forgings |
A technically clear purchase description is therefore:
EN 1092-1 Type 11 weld neck flange manufactured from P250GH / 1.0460 forging material to EN 10222-2.
P250GH Chemical Composition
Typical EN 10222-2 cast-analysis limits for P250GH / 1.0460 include:
| Element | Requirement |
|---|---|
| Carbon, C | 0.18–0.23% |
| Silicon, Si | 0.40% max |
| Manganese, Mn | 0.30–0.90% |
| Phosphorus, P | 0.025% max |
| Sulfur, S | 0.015% max |
| Al total | 0.020% min |
| Nitrogen, N | 0.012% max |
| Chromium, Cr | 0.30% max |
| Copper, Cu | 0.30% max |
| Molybdenum, Mo | 0.08% max |
| Niobium, Nb | 0.01% max |
| Nickel, Ni | 0.30% max |
| Titanium, Ti | 0.03% max |
| Vanadium, V | 0.02% max |
| Cr + Cu + Mo + Ni | 0.70% max |
| Carbon Equivalent, CEV | 0.43% max |
The actual heat chemistry should be confirmed by the supplied EN 10204 3.1 Material Test Certificate.
Mechanical Properties of P250GH Forgings
The mechanical properties of P250GH depend on the ruling section thickness of the forging.
| Ruling Section Thickness | Yield Strength Min. | Tensile Strength |
|---|---|---|
| ≤60 mm | 250 MPa | 410–540 MPa |
| >60–105 mm | 240 MPa | 410–540 MPa |
| >105–225 mm | 230 MPa | 410–540 MPa |
| >225–375 mm | 210 MPa | 400–520 MPa |
| >375–750 mm | 200 MPa | 400–520 MPa |
Therefore, P250GH should not be described using a single universal yield-strength value for every flange thickness.
Elongation and impact requirements also depend on section thickness and specimen orientation and should be verified against the ordered EN 10222-2 requirements.
Heat Treatment of P250GH
P250GH / 1.0460 forgings are normally supplied in the normalized condition (+N).
Typical EN 10222-2 normalizing temperature for P250GH is:
890–950°C, followed by air cooling.
Normalization supports a controlled microstructure and consistent mechanical properties throughout the forged component.
The heat-treatment condition and relevant test results should be documented on the material certificate.
EN 1092-1 B1 vs B2 Raised Face
Both B1 and B2 are Type B raised-face flange facings, but they have different specified surface-finish requirements.
| Item | B1 | B2 |
|---|---|---|
| Facing Type | Raised Face | Raised Face |
| Status | Standard facing | By agreement |
| Main Difference | Standard surface finish | Different controlled surface finish |
| Specification | EN 1092-1 | EN 1092-1 |
B1 is the standard raised-face finish for the applicable PN flange range.
B2 may be specified when a different sealing-surface roughness is required by the purchaser or gasket system.
The required facing should therefore be stated in the purchase order rather than specifying only “RF”.
Typical DN & PN Supply
Our typical P250GH Type 11 flange supply includes:
| Parameter | Typical Availability |
|---|---|
| DN | DN10–DN600 |
| PN | PN6 / PN10 / PN16 / PN25 / PN40 / PN63 / PN100 |
| Facing | B1 / B2 |
| Material | P250GH / 1.0460 |
| Condition | Normalized |
| Bore | Standard / Project Specific |
| Weld End | According to pipe WT / project requirement |
| Surface | Black / Rust-Preventive Oil / Coating as specified |
| Packing | Plywood Case / Wooden Pallet |
EN 1092-1 as a whole covers a much wider range of DN and PN designations, but not every DN/PN combination is available for every flange type.
The actual Type 11 dimensions should therefore be verified for the specified DN and PN combination.
Pressure & Elevated-Temperature Service
P250GH is designed for pressure applications requiring specified elevated-temperature properties and is commonly used for steam, boiler, process and industrial pressure systems.
Commercial material references often associate P250GH with elevated-temperature use in the approximate 450–480°C range.
However, this should not be treated as a universal maximum operating temperature for an EN 1092-1 flange.
Actual allowable pressure at temperature depends on:
- PN designation
- Material group
- Operating temperature
- Applicable EN 1092-1 pressure/temperature rating
- Piping or equipment design code
- Service medium
- Design life
The flange pressure rating generally decreases as operating temperature increases.
Applications of P250GH Type 11 Flanges
EN 1092-1 P250GH weld neck flanges are commonly used in:
- Steam piping
- Boiler systems
- Power-generation plants
- Pressure equipment
- Petrochemical plants
- Chemical-process piping
- Industrial heating systems
- Hot-water piping
- Process equipment connections
- Valve and pump connections
Weld-neck construction is particularly useful where reliable stress transfer and a full-penetration butt-welded connection are required.
Inspection & Certification
P250GH flanges can be supplied with:
- EN 10204 Type 3.1 Inspection Certificate
- Chemical composition report
- Mechanical test results
- Heat-treatment records
- Dimensional inspection
- Visual inspection
- Hardness testing when specified
- Ultrasonic examination when required
- Impact testing according to specification
- Third-party inspection
- Full heat-number traceability
EN 10204 Type 3.2 documentation can also be arranged when required by the project and agreed before manufacture.
Related EN Flange Products
Related products for European pressure piping systems include:
- EN 1092-1 Type 01 P250GH Plate Flange
- EN 1092-1 Type 05 P250GH Blind Flange
- EN 1092-1 P245GH Flange
- EN 1092-1 P265GH Flange
- ASTM A105 Weld Neck Flange
- EN 10222-2 P250GH Forged Components
These product names should be linked to their corresponding internal pages to create a clear EN 1092-1 flange + pressure-purpose forging material topic cluster.
Frequently Asked Questions
What is an EN 1092-1 Type 11 flange?
EN 1092-1 Type 11 is a weld-neck steel flange joined to pipe by butt welding. It is available in multiple DN and PN combinations with facing types such as B1 or B2.
What is P250GH / 1.0460?
P250GH / 1.0460 is a non-alloy steel for pressure purposes with specified elevated-temperature properties. It is used for forged pressure components including EN 1092-1 flanges.
Is C22.8 the same as P250GH?
C22.8 is the former DIN 17243 designation associated with today’s P250GH / 1.0460 material. C22.8 remains common in older drawings and commercial enquiries, while P250GH / 1.0460 is the current EN terminology.
What is the difference between EN 1092-1 B1 and B2?
B1 and B2 are both raised-face configurations. B1 is the standard facing, while B2 uses a different specified surface finish and is normally supplied when agreed between the purchaser and manufacturer.
What is the difference between EN 1092-1 and EN 10222-2?
EN 1092-1 specifies the flange design, dimensions, facing and PN system. EN 10222-2 specifies the P250GH forging material and its chemical, heat-treatment and mechanical requirements.
EN 1092-1 P250GH Flange Manufacturer
We manufacture and supply EN 1092-1 Type 11 P250GH / 1.0460 weld neck flanges for steam, boiler, power, chemical and industrial pressure piping projects.
Available options include B1/B2 facing, customized bore and weld-end dimensions, normalized heat treatment, EN 10204 3.1 certification and third-party inspection.
For quotation, please specify:
Type + Material + DN + PN + Facing + Pipe Wall Thickness/Bore + Quantity + Inspection Requirements
Example:
EN 1092-1 Type 11, P250GH / 1.0460, DN100, PN40, B1, EN 10204 3.1
