ASTM A182 F11 Forged Fittings Manufacturer and Supplier
Metinox Overseas manufactures and supply ASTM A182 F11 forged fittings in 1.25Cr-0.5Mo steel for high temperature boiler, power plant and pressure pipe applications throughout the world to both ASTM A182 and ASME SA182 standards. These fittings are part of our full line of Alloy Steel Pipe Fittings and come in various sizes ranging from 1/4” to 4” and are supplied in socket weld and threaded fittings at various pressure ratings including Class 3000, 6000, and 9000 LB. The one thing we always check before ordering is that there are 3 (legally different) classes of F11 under the same standard. Class 1 is also normalised and tempered to a lower tensile level and not suitable for high pressure instrument taps. Class 2 is the standard grade for boiler and power plant service and is the most common grade that is ordered. High pressure small bore connections, with the wall thickness determining the pressure/temperature rating, require Class 3 connections. The specification of Class 1 when Class 3 is required is a typical procurement mistake which is an ASME non-conformance. These fittings can be used in conjunction with our section on Alloy Steel Pipes (A335 P11) being sourced as complete small-bore system packages.
Table of Contents
- ASTM A182 F11 Forged Fittings Manufacturer and Supplier Overview
- ASTM A182 F11 Specification
- ASTM A182 F11 Forged Fitting Types
- F11 Class 1 vs Class 2 vs Class 3
- A182 F11 vs A234 WP11: Same Grade, Different Spec
- ASTM A182 F11 Forged Fitting Equivalent Grades
- ASTM A182 F11 Forged Fitting Chemical Composition
- ASTM A182 F11 Forged Fitting Mechanical Properties
- F11 vs F22 Forged Fittings Comparison
- Pressure Classes and Size Range
- Applications of ASTM A182 F11 Forged Fittings
- Related Products
- Frequently Asked Questions
ASTM A182 F11 Specification
| Parameter | Details |
|---|---|
| ASTM Standard | ASTM A182 |
| ASME Equivalent | ASME SA182 |
| UNS Number | K11597 |
| Classes Available | Class 1, Class 2, Class 3 |
| Heat Treatment | Normalised and Tempered |
| Min Temper Temperature | 620 degrees C (1148 degrees F) |
| Dimensional Standard | ASME B16.11 |
| Pressure Ratings (ASME B16.11) | 3000 LB, 6000 LB, 9000 LB |
| Size Range | 1/4 inch to 4 inch |
| Connection Types | Socket Weld (SW), Threaded (THD) |
ASTM A182 F11 Forged Fitting Types
Socket Weld Elbow
Threaded Elbow
Socket Weld Tee
Threaded Tee
Coupling
Union
Get ASTM A182 F11 Forged Fittings with EN 10204 3.1 Mill Test Reports
Contact our technical team for class confirmation, dimensional check, and pricing before your next purchase order.
Request a QuoteF11 Class 1 vs Class 2 vs Class 3
The F11 Class 1, 2, and 3 difference is a design obligation, not a preference. The table below defines minimum mechanical requirements and the correct use case for each class of SA182 F11 forged pipe fittings.
| Class | Min Tensile Strength | Min Yield Strength (0.2% Offset) | Hardness (HBW) | Use Case |
|---|---|---|---|---|
| Class 1 | 415 MPa (60 ksi) | 205 MPa (30 ksi) | 121-174 HBW | Low-pressure general service. Not suitable for high-pressure instrument taps. Common source of procurement error. |
| Class 2 | 485 MPa (70 ksi) | 275 MPa (40 ksi) | 143-207 HBW | Standard boiler and power plant connections. Most commonly ordered class worldwide. |
| Class 3 | 515 MPa (75 ksi) | 310 MPa (45 ksi) | 156-207 HBW | High-pressure small-bore instrument connections where wall thickness governs pressure-temperature rating. Mandatory where Class 2 is insufficient. |
Substituting Class 1 for Class 2 in a boiler instrument connection, or Class 2 for Class 3 in a high-pressure tap, constitutes an ASME non-conformance. Metinox confirms class designation with each purchase order acknowledgement before production.
The temper temperature for all F11 classes is a minimum of 620°C (1148°F). This requirement is what differentiates the F11 heat treatment from lower-alloy grades and ensures the chromium carbides are correctly dissolved to deliver the specified creep resistance.
A182 F11 vs A234 WP11: Same Grade, Different Spec
ASTM A182 F11 andASTM A234 WP11 Pipe Fittings share identical 1.25Cr-0.5Mo chemistry but govern entirely different product forms and connection types. Selecting the wrong spec is a common source of drawing errors on small-bore power-plant piping packages.
| Parameter | ASTM A182 F11 | ASTM A234 WP11 |
|---|---|---|
| Product Form | Forged fittings | Wrought butt-weld fittings |
| Connection Type | Socket weld and threaded | Butt-weld |
| Typical Size Range | 1/4 inch to 4 inch | 1/2 inch and above |
| Dimensional Standard | ASME B16.11 | ASME B16.9 |
| ASTM Standard | ASTM A182 / ASME SA182 | ASTM A234 / ASME SA234 |
| When to Use | Socket weld or threaded joints: instrument taps, small-bore steam connections | Butt-welded mainline piping, larger bore connections |
Metinox Overseas supplies both A182 F11 forged fittings and A234 WP11 buttweld fittings from the same 1.25Cr-0.5Mo heat, a single MTR covers instrument taps and mainline joints on the same power-plant circuit.
ASTM A182 F11 Forged Fitting Equivalent Grades
| Standard | UNS | Werkstoff Nr. | Trade Name |
|---|---|---|---|
| Alloy Steel F11 | K11597 | 1.7338 | 1-1/4Cr-1/2Mo |
ASTM A182 F11 Forged Fitting Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| Alloy Steel F11 | 0.15 max | 0.3-0.6 | 0.5-1 | 0.03 | 0.03 | 1-1.5 | 0.44-0.65 |
ASTM A182 F11 Forged Fitting Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min |
|---|---|---|---|
| Alloy Steel F11 | 415 | 205 | 20 |
F11 vs F22 Forged Fittings Comparison
When selecting between 1.25Cr-0.5Mo and 2.25Cr-1Mo grades, the F11 vs F22 forged fittings comparison below defines the selection boundary. OurASTM A182 F22 Forged Fittings page covers the full F22 specification for higher-temperature and higher-pressure applications. For lower-temperature carbon steel service, ourCarbon Steel Pipe Fittings range is the appropriate selection.
| Property | F11 (1.25Cr-0.5Mo) | F22 (2.25Cr-1Mo) |
|---|---|---|
| Chromium Content | 1.00 to 1.50% | 2.00 to 2.50% |
| Molybdenum Content | 0.44 to 0.65% | 0.87 to 1.13% |
| Max Recommended Service Temperature | Approx 580 degrees C (1076 degrees F) | Approx 625 degrees C (1157 degrees F) |
| Oxidation Resistance | Moderate | Higher |
| Typical Applications | Boiler steam circuits, refinery heater small-bore connections | High-temperature reformers, heavy-wall pressure vessels, hot hydrogen service |
| Relative Cost | Lower | Higher |
If the service temperature is below 580 degrees C and the design does not impose hydrogen partial pressures requiring elevated Cr content, A182 F11 forged fittings deliver a cost-effective and code-compliant solution. Above that threshold, or where the process specification mandates higher Cr, F22 is the correct grade.
Pressure Classes and Size Range
| Pressure Class | Size Range | Socket Weld | Threaded |
|---|---|---|---|
| 3000 LB (Class 3000) | 1/4 inch to 4 inch | Yes | Yes |
| 6000 LB (Class 6000) | 1/4 inch to 4 inch | Yes | Yes |
| 9000 LB (Class 9000) | 1/4 inch to 2 inch | Yes | Yes |
Our ASME B16.11 F11 Class 3000 6000 fittings are the most frequently ordered configurations for boiler and power plant instrument connections. All fittings are supplied with EN 10204 3.1 Mill Test Reports traceable to the heat chemistry. For other grades in the same forged fitting family, refer toASTM A182 F5 Forged Fittings for the 5Cr-0.5Mo grade.
Applications of ASTM A182 F11 Forged Fittings
- Power generation: boiler steam headers, superheater and reheater instrument taps, main steam small-bore connections.
- Refinery process heaters: small-bore branches and instrument taps on fired-heater transfer lines and convection-section coils.
- Petrochemical plants: high-temperature reactor outlet small-bore connections requiring 1.25Cr chemistry.
- EPC small-bore packages: instrument taps, relief-valve inlet and outlet connections where A182 F11 fittings maintain alloy continuity with A335 P11 pipe.
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Send RFQ NowFrequently Asked Questions: ASTM A182 F11 Forged Fittings
Class 1 has a minimum tensile strength of 415 MPa (60 ksi) and minimum yield of 205 MPa (30 ksi). Class 3 requires a minimum tensile of 550 MPa (80 ksi) and minimum yield of 415 MPa (60 ksi). Substituting Class 1 for Class 3 in a high-pressure instrument connection is an ASME code non-conformance and must be corrected at the procurement stage, not after fabrication.
Specify ASTM A182 F11 forged fittings for service temperatures up to approximately 580 degrees C where the pressure-temperature rating can be satisfied by 1.25Cr-0.5Mo chemistry. Specify F22 (2.25Cr-1Mo) above that temperature range, in hot hydrogen service, or where the project specification explicitly requires higher Cr content. F11 is the more economical choice where its temperature capability is sufficient.
Both are 1.25Cr-0.5Mo grades but govern different product forms. ASTM A182 F11 governs forged socket weld and threaded fittings dimensioned to ASME B16.11.ASTM A234 WP11 Pipe Fittings govern wrought butt-weld fittings dimensioned to ASME B16.9. Check the connection type on your isometric: if the joint is socket weld or threaded, A182 F11 applies; if the joint is butt-welded, A234 WP11 applies.
Standard Class 3000 sizes in 1/4 inch to 2 inch are typically available ex-stock with EN 10204 3.1 Mill Test Reports traceable to the heat chemistry. Class 6000 and Class 9000 LB fittings, and sizes above 2 inch, generally require 2 to 4 weeks from mill or stockholder depending on quantity and configuration. Contact us with your complete bill of materials for a confirmed availability and lead time response.
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