ASTM A182 F5 Medium Chromium Alloy Steel Flanges Manufacturer & Supplier
Metinox Overseas is a major producer and distributor of the ASTM A182 F5 Alloy Steel Flange that is directly designed to be used in power generation service, petrochemical service and refinery service as this type of steel offers the highest oxidation and corrosion resistance. ASME SA182-F5 Forged Flange is produced of excellent medium alloy of 5 percentage Chromium -0.5 percentage Molybdenum steel with controlled chemical composition containing chromium (4.00-6.00%), molybdenum (0.45-0.65%), and carbon (0.15 maximal of Class a, 0.10-0.20% of Class b, 0.05-0.15% of Class c), with minimum tensile strength of 485 Mpa These 5Cr-0.5Mo A182 F5 Flanges are specifically engineered to have a high temperature operating temperature with 5Cr-0.5Mo Alloy ranging between -29degC (-20degF) and 649degC (1200degF) with outstanding oxidation resistance and are thus suited to power plant high-temperature steam systems, refinery hydro processing and high temperature petrochemical equipment, corrosive high-temperature and environments that need higher oxidation resistance than F11/F22.
The 5 percent chromium content offers much more oxidation and scaling resistance at a high temperature (when compared to lower chromium grades (F1, F11, F22) whereas the molybdenum addition guarantees sufficient creep strength and hydrogen attack resistance. Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Socket Weld Flanges; our ASTM A182 F5 Weld Neck Flanges are produced in the full compliance of both ANSI/ASME B16.5 (1/2" to 24" NB) and ASME B16.47 Series A and B (26" to 60" NB) dimensional standards, and in pressure classes up to 2500#. All flanges are subjected to a required heat treatment, either a normalizing and tempering, or quenching and tempering, then subjected to stringent quality tests, such as dimensional inspection, PMI verification, tensile tests, hardness tests and ultrasonic tests, as specified in ASTM A961 requirements.
Table of Contents
- ASTM A182 F5 Flanges Technical Specifications
- ASTM A182 F5 Equivalent Grades
- ASTM A182 F5 Chemical Composition
- Mechanical Properties of ASTM A182 F5 Flanges
- ASTM A182 F5 Flange Dimensions & Pressure Rating Chart
- Types of ASTM A182 F5 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is ASTM A182 F5 Good Quality for Oxidizing High-Temperature Service?
- Heat Treatment & Testing Requirements
- ASTM A182 F5 Alloy Steel Flanges Price List 2026
- Applications of ASTM A182 F5 Flanges in Industry
- Why Choose ASTM A182 F5 Flanges from Metinox Overseas?
- ASTM A182 F5 Flange Delivery Time & CIF Pricing by Country
- Other Types of Alloy Steel A182 F5 Flanges
- Popular Locations Where We Supply ASTM A182 F5 Flanges
- Frequently Asked Questions (FAQ)
ASTM A182 F5 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A182 / ASME SA182 / MSS SP-44 |
| Grade | F5 Class a, F5 Class b, F5 Class c |
| Material Designation | 5Cr-0.5Mo (5% Chromium - 0.5% Molybdenum) Medium Alloy Steel |
| UNS Number | K41545 (Class a), K51545 (Class b), K41245 (Class c) |
| 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, Quenched & Tempered, or Annealed & 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 F5 Equivalent Grades
| STANDARD | USA | GERMANY | EUROPE | JAPAN | INDIA | UK | CHINA |
| A182 F5 | ASTM A182 F5 ASME SA182 F5 UNS K41545 |
1.7362 | X10CrMoVNb9-1 | X10CrMoVNb9-1 (similar) SCPH1 |
- | BS 3100 Gr A4 | 5CrMo |
ASTM A182 F5 Chemical Composition
| Element | Class a (%) | Class b (%) | Class c (%) | Function |
| Carbon (C) | 0.15 max | 0.10 - 0.20 | 0.05 - 0.15 | Strength, controlled for weldability |
| Manganese (Mn) | 0.30 - 0.60 | 0.30 - 0.60 | 0.30 - 0.60 | Deoxidizer, hardenability |
| Phosphorus (P) | 0.040 max | 0.040 max | 0.040 max | Controlled for toughness |
| Sulfur (S) | 0.040 max | 0.040 max | 0.040 max | Minimized for ductility |
| Silicon (Si) | 0.50 max | 0.50 max | 1.00 max | Deoxidizer, oxidation resistance |
| Chromium (Cr) | 4.00 - 6.00 | 4.00 - 6.50 | 4.00 - 6.50 | Superior oxidation resistance at high temp |
| Molybdenum (Mo) | 0.45 - 0.65 | 0.45 - 0.65 | 0.45 - 0.65 | Creep strength, hydrogen resistance |
Note: Class a (most common) has lower carbon for better weldability. Class b has higher carbon for strength. Class c has lowest carbon and higher silicon for maximum oxidation resistance.
Mechanical Properties of ASTM A182 F5 Flanges
| Property | Class a | Class b | Class c | Testing Standard |
| Tensile Strength | 485 MPa (70 ksi) min | 515 MPa (75 ksi) min | 485 MPa (70 ksi) min | ASTM A370 |
| Yield Strength (0.2% offset) | 205 MPa (30 ksi) min | 275 MPa (40 ksi) min | 205 MPa (30 ksi) min | ASTM A370 |
| Elongation in 2" | 20% minimum | 20% minimum | 20% minimum | ASTM A370 |
| Reduction of Area | 35% minimum | 35% minimum | 35% minimum | ASTM A370 |
| Hardness (Brinell) | 163-223 HB | 179-235 HB | 163-223 HB | ASTM E10 |
ASTM A182 F5 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for A182 F5 Class a 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 |
| 400 (204) | 260 psi | 675 psi | 1350 psi | 2025 psi | 3375 psi | 5625 psi |
| 600 (316) | 230 psi | 655 psi | 1315 psi | 1970 psi | 3280 psi | 5470 psi |
| 650 (343) | 200 psi | 635 psi | 1270 psi | 1900 psi | 3170 psi | 5280 psi |
| 700 (371) | 170 psi | 600 psi | 1200 psi | 1795 psi | 3000 psi | 4995 psi |
| 750 (399) | 140 psi | 550 psi | 1095 psi | 1640 psi | 2735 psi | 4560 psi |
| 800 (427) | 125 psi | 535 psi | 1075 psi | 1610 psi | 2685 psi | 4480 psi |
| 850 (454) | 110 psi | 505 psi | 1010 psi | 1515 psi | 2530 psi | 4215 psi |
| 900 (482) | 95 psi | 485 psi | 970 psi | 1460 psi | 2430 psi | 4045 psi |
| 950 (510) | 80 psi | 410 psi | 825 psi | 1230 psi | 2055 psi | 3430 psi |
| 1000 (538) | 65 psi | 270 psi | 540 psi | 805 psi | 1345 psi | 2240 psi |
| 1050 (566) | 50 psi | 170 psi | 340 psi | 510 psi | 845 psi | 1410 psi |
| 1100 (593) | 40 psi | 135 psi | 270 psi | 405 psi | 675 psi | 1125 psi |
| 1150 (621) | 30 psi | 105 psi | 210 psi | 315 psi | 530 psi | 880 psi |
| 1200 (649) | 20 psi | 80 psi | 160 psi | 240 psi | 400 psi | 670 psi |
Types of ASTM A182 F5 Flanges Available
ASTM A182 F5 Orifice Flange
ASTM A182 F5 Threaded Flange
ASTM A182 F5 Reducing Flange
ASTM A182 F5 Lap Joint Flange
ASTM A182 F5 Long Weld Neck Flange
ASTM A182 F5 Socket Weld Flange
ASTM A182 F5 Weld Neck Flange
ASTM A182 F5 Blind Flange
ASTM A182 F5 Slip-On Flange
Standard Flange Sizes & Weight Chart
ASTM A182 F5 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 | 0.70 |
| 1" | 124 | 16 | 33 | 54 | 89 | 4 | M16 | 1.45 |
| 2" | 165 | 19 | 60 | 79 | 127 | 8 | M16 | 3.05 |
| 4" | 254 | 24 | 114 | 137 | 200 | 8 | M19 | 9.20 |
| 6" | 318 | 29 | 168 | 197 | 254 | 12 | M22 | 18.5 |
| 8" | 381 | 32 | 219 | 251 | 305 | 12 | M22 | 30.5 |
| 10" | 445 | 35 | 273 | 320 | 370 | 16 | M25 | 45.0 |
| 12" | 521 | 38 | 324 | 362 | 438 | 20 | M25 | 68.5 |
| 16" | 648 | 46 | 419 | 473 | 560 | 20 | M32 | 123.0 |
| 20" | 775 | 51 | 508 | 584 | 673 | 24 | M32 | 192.0 |
| 24" | 915 | 57 | 610 | 681 | 787 | 24 | M38 | 294.0 |
Is ASTM A182 F5 Good Quality for Oxidizing High-Temperature Service?
Yes, ASTM A182 F5 is a good selection in the case of high temperature conditions where high oxidation and scaling resistance is needed and it is not possible to achieve this with F11 and F22. The 5% chromium level, which is also much higher than F11 (1.25Cr) and F22 (2.25Cr), forms a more protective and stable chromium oxide (Cr 2 O 3 ) layer on the surface during higher temperatures which gives it outstanding resistance against oxidation, scaling, and high temperature corrosion against oxidizing environment.
The increased oxidation resistance of the F5 is especially important in the application where the F5 is used (cyclic thermal conditions) and requires repeated heating and cooling repeated heating and cooling can cause spalling of the oxide scales on the lower chromium alloys. The material has an integrity of its protective oxide coating even when subjected to thermal cycling and does not experience accelerated metal loss. The 0.5% molybdenum level content yields sufficiently high creep strength and hydrogen attack resistance such that F5 can be used in both oxidizing and in high temperature service, as well as in in hydrogen bearing environments.
The specification provides three types of classes which are more suited to various needs: Class a (0.15% max carbon) is the most widespread one, offering high weldability, but with decent strength. Class b (0.10-0.20% carbon) is stronger to provide more challenging applications. Class c (0.05-0.15% carbon containing additional silicon up to 1.00) offers the highest oxidation resistance by both chromium and silicon oxide development.
F5 is designed to be used in the power plants which need higher oxidation resistance than F22, especially in the superheater and reheater parts that are exposed to flue gas on the exterior. It has also been employed in refinery unit where there are conditions of high temperature oxidation, petrochemical thermal crackers and in processes where the surface loss of metal by oxidation is an issue. ASME B16.5 rates the material at 649 o C (1200 F) of service.
F5 is slightly better than F11/F22 in oxidation resistance yet has the same creep strength. Where high oxidation properties are needed coupled with high creep strength above 593 C consider F9 (9Cr-1Mo) which provides these qualities. F5 is a cost effective upgrading of F22 in situations where the main issue is the oxidation resistance.
Heat Treatment & Testing Requirements
Heat Treatment Process
| Step | Temperature | Cooling / Remarks |
| Normalizing + Tempering (Mandatory) | ||
| Normalizing | 980-1010-C (1800-1850-F) | Cool uniformly in air |
| Tempering | 730-800-C (1350-1470-F) | Adequate holding time, air cool |
| Quenching + Tempering | ||
| Austenitizing | 980-1010-C | - |
| Quenching | - | Oil or water quench |
| Tempering | 730-800-C (minimum) | Air cool |
| Annealing + Tempering (Class C) | ||
| Annealing | 870-900-C | Furnace cool |
| Tempering | 730-800-C | Air cool |
Testing & Inspection Requirements
| Test / Inspection | Standard / Requirement | Remarks / Acceptance |
| 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 5% chromium content (critical) |
| Chemical Analysis | Product analysis | Chromium 4.00-6.00% and molybdenum verification |
| Ultrasonic Testing | ASTM A388 | When specified |
| Hydrostatic Testing | ASTM A961 or MSS SP-44 | As applicable / when specified |
ASTM A182 F5 Alloy Steel Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $18 - $48 |
| Weld Neck (WN) | 4" - 8" | 150# | $72 - $295 |
| Weld Neck (WN) | 10" - 24" | 150# | $465 - $1,680 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $26 - $68 |
| Weld Neck (WN) | 4" - 8" | 300# | $115 - $450 |
| Weld Neck (WN) | 10" - 24" | 300# | $675 - $2,380 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $38 - $105 |
| Weld Neck (WN) | 4" - 8" | 600# | $190 - $650 |
| Slip-On (SO) | 1/2" - 2" | 150# | $15 - $38 |
| Slip-On (SO) | 4" - 8" | 150# | $58 - $235 |
| Blind (BL) | 1/2" - 2" | 150# | $13 - $35 |
| Blind (BL) | 4" - 8" | 150# | $62 - $265 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $20 - $85 |
Note: A182 F5 flanges are typically 110-150% higher than A105 and 20-30% higher than F22 due to higher chromium content and specialized heat treatment.
Applications of ASTM A182 F5 Flanges in Industry
The ASTM A182 F5 Alloy Steel Flanges are commonly used in many industrial applications, and some of the common industries are given below.
Power Generation
Superheater/reheater areas with oxidizing flue gas in them, high-temps steam piping and cyclic service.
Refinery
Units having high-temperature oxidizing conditions, catalytic reformer high- Temp areas, thermal cracking units.
Petrochemical
Outlet of ethylene cracker furnace, thermal oxidation, high-temp cyclic service.
Chemical Processing
High temperature reactors in oxidizing reactor, ammonia making high-temp areas.
Waste Incineration
Handling of high-temperature flue gases, high-tempo waste-to-energy plant.
Furnace Applications
Heat treatment furnaces, oxidizing atmosphere industrial furnaces.
Steam Systems
Pressure steam, having cyclic thermal properties, Waste heat recovery systems.
Why Choose ASTM A182 F5 Flanges from Metinox Overseas?
Metinox Overseas provides certified ASTM A182 F5 medium chromium alloy steel flanges with mandatory certification of heat treatment, certified 5 percent chromium content, and ensured resistance to oxidation in the high-temperature usage. Our certified ISO 9001:2015 facilities have to guarantee that all F5 flanges receive proper heat treatment where temperatures have been recorded.
All flanges come with EN 10204 3.1B Mill Test Certificates of chemical composition verified with Cr (4.00-6.00%) and tensile properties, hardness values, heat treatment documentation with compliance statements. Our PMI testing is used to check the contents of chromium, dimensional checking, and optional ultrasonic inspection.
Our technical support can provide the specialist assistance on the F5 vs F22 vs F9 material choice in case of the oxidizing service, the welding operations with the 5Cr-0.5Mo steels (preheat 230-290degC, PWHT at 730-800degC is obligatory) and the adherence to the ASME B31.1 and B31.3. The supply of power plants, refineries and petrochemical plants all over the world.
ASTM A182 F5 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 | 12-16 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg, Antwerp | 26-32 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York, Los Angeles | 32-40 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang, Manila | 16-22 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban, Mombasa | 22-30 Days | CIF Lagos / CIF Durban |
Other Types of Alloy Steel A182 F5 Flanges
ASTM A182 F5 Class a Flanges, A182 F5 Class b Flanges, A182 F5 Class c Flanges, 5Cr-0.5Mo Weld Neck Flanges, ASME SA182 F5 Blind Flanges, A182 F5 Socket Weld Flanges, F5 High-Temperature Flanges, F5 Oxidation Resistant Flanges.
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Frequently Asked Questions (FAQ)
F5 would have 5 percent Chromium (as compared to 2.25 percent in F22) which would give the product excellent oxidation and scaling properties in high temperatures. F5 gives a stronger layer of chromium oxide, which is improved to oxidize as well as cyclic thermal service. Their creep strengths and temperature limits are similar (649 o C/1200 o F).
Selecting F5 when oxidation/scaling resistance is vital, application in which the exposure is to oxidizing flue gases, cyclic thermal conditions or external corrosion of the surface are of interest. In the absence of the primary concern of oxidation F22 is sufficient. F5 costs 20-30% more than F22.
Class a (0.15% max C) most common, good welding. Class b (0.10-0.20% C) higher strength. maximum resistance to oxidation with chromium and silicon oxides at class c (0.05-0.15% C, 1.00% max Si). Classes a, c general service, severe oxidizing conditions.
Yea the 0.5 percent molybdenum content gives protection against hydrogen attack. F5 is appropriate to hydrogen-bearing conditions both at high temperatures according to API 941 requirements, and offers both hydrogen resistance and oxidation resistance.
Yes, heat treatment after a weld is obligatory at 730-800 o C (1350-1470 F) according to ASME standards. Minimum preheat 230-290-C required. F5 is much more sensitive to PWHT temperature as compared to F11/F22 owing to the increased chromium content.
SMAW: E8018-B2 or E502-15/16/ 5Cr-0.5Mo electrode, GMAW: ER80S-B2 or ER502, GTAW: ER80S-B2 or ER502. Minimum preheat 230-290 o C, interpass min 315o c, required PWHT 730-800 o C. be equivalent in filler metal.
F9 (9Cr-1Mo): contains more chromium (9-15% vs 50.05) which gives it superior oxidation resistance and creep strength. F9 is used in case of severe high temperature service (more than 538C). F5 is less costly and simple to weld. F9 should have stricter control of heat treatment.
Yes, with NACE MR0175 compliance. State hardness not more than 22 HRC, product analysis, verification of heat treatment and sour service. F5 offers sufficient heat treatment of H 2S resistance.
ASME B16.5 maximum continuous operating temperature is 649 o C (1200 o F), identical to F22. High temperature capability is not high temperature resistance but better oxidation resistance at high temperature which F5 has over F22.
Small stocks since it is a specialty. Made-to-order 8-10 weeks which encompasses forging, higher temperatures of normalizing and tempering, mechanical test, PMI confirmation of the chromium content and documentation. Rapid service that can be used in cases of urgency
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