ASTM A182 F11 Chromium Molybdenum Alloy Steel Flanges Manufacturer & Supplier
Metinox Overseas is a pioneering producer and marketer of ASTM A182 F11 Alloy Steel Flanges which are designed with high-temperature and high pressures in use in power generation, petrochemical, and refinery services. Our ASME SA182 F11 Forged Flanges are made of high quality 1.25% Chromium -0.5% Molybdenum low alloy steel of controlled chemical compositions with chromium (1.00-1.50) and molybdenum (0.44-0.65) and carbon (0.05-0.15) in both Class 1 and Class 2 with minimum tensile strength of 485 MPa and yield strength of 205 Mpa. These Cr-Mo Alloy A182 F11 Flanges are developed to be used in high temperature service between -29degC (-20degF) and 593degC (1100degF) service, thus they can be used in power plant steam lines, refinery systems hydroprocessing, high temperature piping systems, hydrogen service, as well as in petrochemical high temperature services.
The alloying elements that enhance creep strength, oxidation resistance and hydrogen attack resistance at high temperatures are the chromium and molybdenum in comparison to carbon steel. ASTM A182 F11 Weld Neck Flange, Slip-On Flanges, Blind Flanges and Socket Weld Flanges are made in full compliance with ANSI/ASME B16.5 (1/2- 24 inch NB) and ASME B16.47 Series A and B (26 inch- 60 inch NB) dimensions and are available in 150 to 2500 pressure classes. All flanges are subject to compulsory heat treatment normalizing and tempering or quenching and tempering then followed by severe quality testing such as dimensional inspection, PMI testing, tensile testing, hardness testing, and ultrasonic testing as required by ASTM A961.
Table of Contents
- ASTM A182 F11 Flanges Technical Specifications
- ASTM A182 F11 Equivalent Grades
- ASTM A182 F11 Chemical Composition
- Mechanical Properties of ASTM A182 F11 Flanges
- ASTM A182 F11 Flange Dimensions & Pressure Rating Chart
- Types of ASTM A182 F11 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is ASTM A182 F11 Good Quality for High-Temperature Applications?
- Heat Treatment & Testing Requirements
- ASTM A182 F11 Alloy Steel Flanges Price List 2026
- Applications of ASTM A182 F11 Flanges in Industry
- Why Choose ASTM A182 F11 Flanges from Metinox Overseas?
- ASTM A182 F11 Flange Delivery Time & CIF Pricing by Country
- Other Types of Alloy Steel A182 F11 Flanges
- Popular Locations Where We Supply ASTM A182 F11 Flanges
- Frequently Asked Questions (FAQ)
ASTM A182 F11 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A182 / ASME SA182 / MSS SP-44 |
| Grade | F11 Class 1, F11 Class 2, F11 Class 3 |
| Material Designation | 1.25Cr-0.5Mo (1-Cr--Mo) Low Alloy Steel |
| UNS Number | K11597 (Class 1), K12023 (Class 2), K11572 (Class 3) |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44 |
| Size Range | 1/2" (15 NB) to 60" (1500 NB) |
| Pressure Class | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# (B16.5); 75#, 150#, 300#, 400#, 600#, 900# (B16.47) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged |
| Heat Treatment | Normalized & Tempered, or Quenched & Tempered (Mandatory) |
| Testing | Tensile Test, Hardness Test, PMI Test, Ultrasonic Test, Hydrostatic Test |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B MTC, NACE MR0175, PED 2014/68/EU, CE Marked, ASME B31.1, B31.3 |
ASTM A182 F11 Equivalent Grades
| STANDARD | USA | GERMANY | EUROPE | JAPAN | INDIA | UK | CHINA |
| A182 F11 | ASTM A182 F11 ASME SA182 F11 UNS K11597 |
1.7335 13CrMo4-5 |
13CrMo4-5 EN 10222-2 |
SCPH11 JIS G5151 |
- | BS 1503-660 Gr 620 | 12Cr1MoV |
ASTM A182 F11 Chemical Composition
The detailed composition of this material is given in the following table.
| Element | Class 1 (%) | Class 2 (%) | Class 3 (%) | Function |
| Carbon (C) | 0.05 - 0.15 | 0.10 - 0.20 | 0.05 - 0.17 | Strength, controlled for weldability |
| Manganese (Mn) | 0.30 - 0.60 | 0.30 - 0.60 | 0.30 - 0.80 | Deoxidizer, hardenability |
| Phosphorus (P) | 0.025 max | 0.025 max | 0.025 max | Controlled for toughness |
| Sulfur (S) | 0.025 max | 0.025 max | 0.025 max | Minimized for ductility |
| Silicon (Si) | 0.50 - 1.00 | 0.50 - 1.00 | 0.50 - 1.00 | Deoxidizer, oxidation resistance |
| Chromium (Cr) | 1.00 - 1.50 | 1.00 - 1.50 | 1.00 - 1.50 | High-temp strength, oxidation resistance |
| Molybdenum (Mo) | 0.44 - 0.65 | 0.44 - 0.65 | 0.44 - 0.65 | Creep strength, hydrogen resistance |
| Vanadium (V) | - | - | 0.15 - 0.30 | Grain refinement (Class 3 only) |
Note: Class 1 has lower carbon for better weldability and toughness. Class 2 has higher carbon for greater strength. Class 3 contains vanadium for enhanced creep resistance.
Mechanical Properties of ASTM A182 F11 Flanges
The mechanical properties decide the shelflife of the material. The table below gives the information about the mechanical properties of ASTM A182 F11 Flanges.
| Property | Class 1 | Class 2 | Class 3 | Testing Standard |
| Tensile Strength | 485 MPa (70 ksi) min | 485 MPa (70 ksi) min | 540 MPa (78 ksi) min | ASTM A370 |
| Yield Strength (0.2% offset) | 205 MPa (30 ksi) min | 275 MPa (40 ksi) min | 415 MPa (60 ksi) min | ASTM A370 |
| Elongation in 2" | 20% minimum | 20% minimum | 18% minimum | ASTM A370 |
| Reduction of Area | 35% minimum | 35% minimum | 35% minimum | ASTM A370 |
| Hardness (Brinell) | 163-223 HB | 179-235 HB | 187-248 HB | ASTM E10 |
ASTM A182 F11 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for A182 F11 Class 1 Flanges
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|
| -20 to 100 (-29 to 38) | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| 200 (93) | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| 300 (149) | 260 psi | 675 psi | 1350 psi | 2025 psi | 3375 psi | 5625 psi |
| 400 (204) | 230 psi | 655 psi | 1315 psi | 1970 psi | 3280 psi | 5470 psi |
| 500 (260) | 200 psi | 635 psi | 1270 psi | 1900 psi | 3170 psi | 5280 psi |
| 600 (316) | 170 psi | 600 psi | 1200 psi | 1795 psi | 3000 psi | 4995 psi |
| 650 (343) | 140 psi | 550 psi | 1095 psi | 1640 psi | 2735 psi | 4560 psi |
| 700 (371) | 125 psi | 535 psi | 1075 psi | 1610 psi | 2685 psi | 4480 psi |
| 750 (399) | 110 psi | 505 psi | 1010 psi | 1515 psi | 2530 psi | 4215 psi |
| 800 (427) | 95 psi | 410 psi | 825 psi | 1230 psi | 2055 psi | 3430 psi |
| 850 (454) | 80 psi | 270 psi | 540 psi | 805 psi | 1345 psi | 2240 psi |
| 900 (482) | 65 psi | 170 psi | 340 psi | 510 psi | 845 psi | 1410 psi |
| 950 (510) | 50 psi | 135 psi | 270 psi | 405 psi | 675 psi | 1125 psi |
| 1000 (538) | 40 psi | 105 psi | 210 psi | 315 psi | 530 psi | 880 psi |
| 1050 (566) | 30 psi | 80 psi | 160 psi | 240 psi | 400 psi | 670 psi |
| 1100 (593) | 20 psi | 55 psi | 110 psi | 165 psi | 275 psi | 460 psi |
Note: F11 maintains pressure ratings significantly better than carbon steel at elevated temperatures above 800-F.
Types of ASTM A182 F11 Flanges Available
ASTM A182 F11 Orifice Flange
ASTM A182 F11 Threaded Flange
ASTM A182 F11 Reducing Flange
ASTM A182 F11 Lap Joint Flange
ASTM A182 F11 Long Weld Neck Flange
ASTM A182 F11 Socket Weld Flange
ASTM A182 F11 Weld Neck Flange
ASTM A182 F11 Blind Flange
ASTM A182 F11 Slip-On Flange
Standard Flange Sizes & Weight Chart
ASTM A182 F11 Weld Neck Flange Dimensions (ANSI B16.5) - Class 300 Sample
| NPS | Outside Diameter (mm) | Thickness (mm) | Bore (mm) | Hub Dia (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Dia | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 95 | 14 | 21 | 38 | 66 | 4 | M12 | 0.68 |
| 1" | 124 | 16 | 33 | 54 | 89 | 4 | M16 | 1.42 |
| 2" | 165 | 19 | 60 | 79 | 127 | 8 | M16 | 3.00 |
| 4" | 254 | 24 | 114 | 137 | 200 | 8 | M19 | 9.05 |
| 6" | 318 | 29 | 168 | 197 | 254 | 12 | M22 | 18.1 |
| 8" | 381 | 32 | 219 | 251 | 305 | 12 | M22 | 30.0 |
| 10" | 445 | 35 | 273 | 320 | 370 | 16 | M25 | 44.2 |
| 12" | 521 | 38 | 324 | 362 | 438 | 20 | M25 | 67.3 |
| 16" | 648 | 46 | 419 | 473 | 560 | 20 | M32 | 121.0 |
| 20" | 775 | 51 | 508 | 584 | 673 | 24 | M32 | 189.0 |
| 24" | 915 | 57 | 610 | 681 | 787 | 24 | M38 | 289.0 |
Is ASTM A182 F11 Good Quality for High-Temperature Applications?
Indeed, ASTM A182 F11 is a perfect selection in the high-temperature service applications where the creep strength and oxidation resistance are significantly superior to that of carbon steel. The 1.25 percent Chromium and 0.5 percent Molybdenum alloying components offer better high temperature mechanical characteristics than carbon steel A105, still offer commendable strength and pressure holding capacities to 593degC (1100degF).
Chromium also increases the oxidation and corrosion strength at high temperatures, using a protective chromium oxide layer which prevents scaling. Molybdenum plays a major role in enhancing creep strength- resistance to permanent deformation under constant stress at high temperatures, and offers outstanding resistance to hydrogen attack in refinery hydroprocessing conditions. This combination enables F11 to be used in power plant superheater and reheater lines, refinery hydrodesulfurization units, and in high temperature petrochemical piping.
The specification has three classes such as Class 1 (Lower carbon, more weldable, more tough) and Class 2 (Higher carbon, more strong) and Class 3 (vanadium modified with better creep resistance). Class 1 is most usually chosen as general high-temperature service as it is a good combination of strength, weldability and toughness. The compulsory heat treatment, which includes normalizing and tempering or quenching and tempering is done to provide uniform microstructure and best mechanical properties.
F11 has been approved to service up to 593degC (1100degF) with codes of ASME B31.1, power piping and ASME B31.3, process piping. Even at even greater temperatures (up to 649degC/1200degF), F22 (2.25Cr-1Mo) has better creep strength. The F11 is the most cost-effective chromium-molybdenum alloy steel in the general high-temperature service use.
Heat Treatment & Testing Requirements
Heat Treatment Requirements
| Heat Treatment Process | Step | Temperature | Cooling / Notes |
|---|---|---|---|
| Normalizing + Tempering (Mandatory) | Normalizing | 900-960-C (1650-1760-F) | Cool uniformly in air |
| Tempering | 680-750-C (1250-1380-F) | Adequate holding time, air cool | |
| Quenching + Tempering | Austenitizing | 900-960-C | - |
| Quenching | - | Oil or water quench | |
| Tempering | 680-750-C (minimum) | Air cool | |
| Stress Relieving (Optional) | Stress Relief | 650-700-C | When specified by purchaser or code |
Testing & Inspection Requirements
| Test | Standard / Requirement | Remarks |
|---|---|---|
| Tensile Testing | ASTM A370 | Yield strength, tensile strength, elongation, reduction of area |
| Hardness Testing | Brinell hardness | Verification after heat treatment |
| PMI Testing | Positive Material Identification | Verification of Cr-Mo alloy content |
| Chemical Analysis | Product analysis | When specified by purchaser |
| Ultrasonic Testing | ASTM A388 | When specified |
| Hydrostatic Testing | ASTM A961 or MSS SP-44 | As applicable / when specified |
ASTM A182 F11 Alloy Steel Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $12 - $35 |
| Weld Neck (WN) | 4" - 8" | 150# | $52 - $220 |
| Weld Neck (WN) | 10" - 24" | 150# | $350 - $1,280 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $18 - $52 |
| Weld Neck (WN) | 4" - 8" | 300# | $85 - $350 |
| Weld Neck (WN) | 10" - 24" | 300# | $520 - $1,850 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $28 - $78 |
| Weld Neck (WN) | 4" - 8" | 600# | $145 - $520 |
| Slip-On (SO) | 1/2" - 2" | 150# | $10 - $28 |
| Slip-On (SO) | 4" - 8" | 150# | $42 - $175 |
| Blind (BL) | 1/2" - 2" | 150# | $9 - $26 |
| Blind (BL) | 4" - 8" | 150# | $48 - $195 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $15 - $65 |
Note: A182 F11 flanges are typically 80-120% higher than A105 due to alloy content and mandatory heat treatment.
Applications of ASTM A182 F11 Flanges in Industry
The ASTM A182 F11 Chromium Molybdenum Alloy Steel Flanges are commonly used in many industrial applications, and some of the common industries are given below.
Power Generation
High pressure steam piping Superheater and reheater lines, boiler feed systems, turbine connections.
Refinery
Hydrodesulfurization (HDS) unit, hydrotreating, catalyst reforming unit, delayed coking unit.
Petrochemical
Process piping of high temperature, steam crackers, catalytic crackers, thermal cracking units.
Hydrogen Service
Hydrogen production plant, hydrogen distribution, ammonia plant, methanol plant.
Oil Gas
Thermal enhanced oil recovery, high temperature wellhead equipment, steam injection systems.
Chemical Processing
High temperature reactors, distillation columns, heat recovery systems.
Steam Systems
High-pressure superheated steam, district heating, industrial steam distribution.
Why Choose ASTM A182 F11 Flanges from Metinox Overseas?
Metinox Overseas offers certified ASTM A182 F11 chromium-molybdenum alloy steel flanges with compulsory certification of heat treatment, full traceability and the required high temperature performance. Each F11 flange is subjected to a normalizing and tempering heat treatment at documented temperatures and soaking times with all of our ISO 9001:2015 certified facilities.
All flanges are provided with EN 10204 3.1B Mill Test Certificates containing chemical composition with Cr and Mo content verified, tensile test results, hardness values, heat treatment records and compliance statements of ASME B31.1 and B31.3. We offer PMI testing, dimensional inspection as well as optional ultrasonic examination.
Our technical group provides professional advice on the choice of materials to be used in high-temperature duty, welding of Cr-Mo steels (preheat and PWHT 1), as well as adherence to power piping and process piping standards. Catering to power plants, refineries and petrochemical plants throughout the world.
ASTM A182 F11 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
|---|---|---|---|
| Middle East (GCC) | Dubai, Dammam, Doha, Muscat, Kuwait | 10-14 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg, Antwerp | 24-30 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York, Los Angeles | 30-38 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang, Manila | 14-20 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban, Mombasa | 20-28 Days | CIF Lagos / CIF Durban |
Other Types of Alloy Steel A182 F11 Flanges
ASTM A182 F11 Class 1 Flanges, A182 F11 Class 2 Flanges, A182 F11 Class 3 Flanges, Cr-Mo F11 Weld Neck Flanges, 1.25Cr-0.5Mo Slip-On Flanges, ASME SA182 F11 Blind Flanges, A182 F11 Socket Weld Flanges, F11 Threaded Flanges, High-Temperature F11 Flanges.
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Frequently Asked Questions (FAQ)
F11: 1.25% of Chromium and 0.5% of Molybdenum that offer better high temperature strength, creep resistance and hydrogen attack resistance. The F11 is rated up to 593degC (1100degF) compared to 427degC (800degF) of A105. F11 is necessary and necessitates heat treatment and would be more expensive but is necessary in high temperature service.
Class 1 offers less carbon (0.05-0.15 vs 0.10-0.20) that offers improved weldability as well as toughness and yield strength of 205 MPa. Class 2 contains more carbon which gives it more strength with a yield of 275 Mpa. The most likely common specifications in Class 1 include general high-temperature.
Yes F11 is resistant to hydrogen attack, and finds extensive application in hydroprocessing (hydrodesulfurization, hydrotreating) units at high temperature and high hydrogen partial pressure in the refinery. Adhere to API 941 hydrogen service.
ASME B16.5 is maximum continuous operating temperature of 593degC (1100 deg F). At even higher temperatures up to 649degC (1200degF), increase to F22 (2.25Cr-1Mo) that is more creep resistant.
Yes, heat treatment is generally necessary on post-weld heat treatment at 680-750 deg C (1250-1380 deg F) as required by ASME B31.1 and B31.3. Minimum preheat of 175-230 deg C. Filler metals should be similar such as E8018-B2 or ER80S-B2.
F22 (2.25Cr-1Mo) contains more chromium and molybdenum that is giving it better creep strength at high temperature above 538degC. F22 is rated to 649degC vs 593degC for F11. F11 is cheaper in moderate high temperature service, F22 in severe high temperature service.
Yes, with NACE MR0175 compliance. State hardness =22 HRC maximum, product analysis, heat treatment conformance and sour service documentation. F11 is good in H2S resistance when well heat treated.
SMAW, E8018-B2 or E9018-B3, GMAW, ER80S-B2, GTAW, ER80S-B2, SAW, F8A2-EM12K. Preheat 175-230 deg C, interpass Obligatory per code =315 deg C, PWHT 680-750 deg C.
Not required according to ASTM A182 but can be used where service at low temperature or critical requirements are needed. Specified at Charpy testing temperature usually at ambient temperature or design minimum temperature.
Stock items (Class 1, common sizes): 7-10 days ex-works. Both heat treated and made to order: 6-7 weeks to include, forging, normalizing and tempering, mechanical testing and documentation. Rapid service offered.
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