ASTM A694 F52 High Yield Carbon Steel Pipeline Flanges Manufacturer & Supplier
Metinox Overseas is a pioneer in production and distribution of ASTM A694 F52 High Yield Carbon Steel Flanges, which are specifically designed to be used in high-pressure transmission line in oil and gas pipelines, wellhead equipment, and other industrial use that require high mechanical properties. Our ASME SA694 F52 Forged Flanges are produced with high-yield carbon steel with controlled chemical composition that is compatible with API 5L X52 line pipe and ASTM A860 WPHY52 pipe fittings that provide a minimum yield strength of 360 Mpa (52 ksi) and tensile strength of 455-585 Mpa (66-85 ksi). The design of these High Yield A694 F52 Flanges is highly intended to serve in the demanding pipeline transmission systems, Christmas tree manifolds, high-pressure gathering systems and applications where high strength and toughness are required over the F42 or standard A105 carbon steel.
This process of heat treatment is necessary and is accompanied by fully-deoxidized melt and hot forging, which is why microstructure is uniform, notch toughness greater, and the performance under high-pressure cyclic loading and harsh operating conditions is reliable. We produce size ANSI/ASME B16.5 (1/2 to 24 NB) ANSI/ASME B16.47 Series A and B (26 to 60 NB) and MSS SP-44 Weld Neck Flanges, Slip-On Flange, Blind Flange and Threaded Flange with pressure classes of 150 to 2500 pounds per square inch. Every flange is subjected to intensive quality tests such as dimensional inspection, PMI test, tensile test, hardness test, and ultrasonic test as per the requirements of ASTM A961, thereby being completely traceable and with reference to API, ASME and NACE standards in critical pipeline applications.
Table of Contents
- ASTM A694 F52 Flanges Technical Specifications
- ASTM A694 F52 Equivalent Grades
- ASTM A694 F52 Chemical Composition
- Mechanical Properties of ASTM A694 F52 Flanges
- ASTM A694 F52 Flange Dimensions & Pressure Rating Chart
- Types of ASTM A694 F52 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is ASTM A694 F52 Good Quality for High-Pressure Pipelines?
- Heat Treatment & Testing Requirements
- ASTM A694 F52 High Yield Flanges Price List 2026
- Applications of ASTM A694 F52 Flanges in Industry
- Why Choose ASTM A694 F52 Flanges from Metinox Overseas?
- ASTM A694 F52 Flange Delivery Time & CIF Pricing by Country
- Other Types of High Yield A694 F52 Flanges
- Popular Locations Where We Supply ASTM A694 F52 Flanges
- Frequently Asked Questions (FAQ)
ASTM A694 F52 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A694 / ASME SA694 / MSS SP-44 |
| Grade | F52 (52 ksi minimum yield strength) |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, MSS SP-44, API 6A |
| 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) |
| Material Type | High Yield Carbon Steel / HSLA Steel |
| Matching Pipe Grade | API 5L X52 PSL 1 / PSL 2 |
| Matching Fittings | ASTM A860 WPHY52, MSS SP-75 |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged (not machined from plate or bar stock) |
| Heat Treatment | Normalized, Normalized & Tempered, or Quenched & Tempered (Mandatory) |
| Testing | Tensile Test, Hardness Test, PMI Test, Ultrasonic Test, Hydrostatic Test, Impact Test (optional) |
| 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, API 6A, ASME B31.3, B31.4, B31.8 |
ASTM A694 F52 Equivalent Grades
| Standard | USA | Europe | Japan | China | API |
| A694 F52 | ASTM A694 F52 ASME SA694 F52 |
- | - | - | API 5L X52 PSL 1 / PSL 2 |
Note: A694 F52 is designed to match API 5L X52 line pipe grade, ensuring metallurgical compatibility and equivalent mechanical properties throughout the pipeline system.
ASTM A694 F52 Chemical Composition
The detailed composition of this material is given in the following table.
| Element | Composition (%) | Function |
| Carbon (C) | As agreed (typically 0.24-0.26 max) | Controlled for strength, weldability, toughness |
| Manganese (Mn) | As agreed (typically 1.00-1.60) | Strength, toughness, deoxidation |
| Phosphorus (P) | 0.035 max | Controlled for ductility and toughness |
| Sulfur (S) | 0.035 max | Minimized to prevent hot cracking |
| Silicon (Si) | As agreed (typically 0.15-0.45) | Deoxidizer, strength enhancement |
| Copper (Cu) | Reported if present (typically 0.25-0.35) | Atmospheric corrosion resistance |
| Nickel (Ni) | Reported if present | Toughness enhancement |
| Chromium (Cr) | Reported if present | Corrosion resistance, strength |
| Molybdenum (Mo) | Reported if present | High-temperature strength |
| Vanadium (V) | Reported if present | Grain refinement, strength |
| Niobium (Nb) | Reported if present (typically 0.02-0.05) | Grain refinement, precipitation hardening |
| Boron (B) | Reported if present | Hardenability |
Note: Chemical composition agreed between manufacturer and purchaser. Alloying elements shall be reported. Carbon Equivalent typically: CE = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15 = 0.43-0.45.
Mechanical Properties of ASTM A694 F52 Flanges
The mechanical properties decide the shelflife of the material. The table below gives the information about the mechanical properties of ASTM A694 F52 Flanges.
| Property | Requirement | Testing Standard |
| Tensile Strength | 455-585 MPa (66-85 ksi) | ASTM A370 |
| Yield Strength (0.2% offset) | 360 MPa (52 ksi) minimum | ASTM A370 |
| Elongation in 2" | 22% minimum | ASTM A370 |
| Reduction of Area | Not specified (typically >40%) | ASTM A370 |
| Hardness (Brinell) | Typically 150-210 HB | ASTM E10 |
| Charpy V-Notch Impact | Optional (typically 27 J at 0-C when specified) | ASTM A370 |
| Tensile/Yield Ratio | Typically 0.85-0.93 | - |
Note: F52 provides approximately 44% higher yield strength than A105 (36 ksi) and 24% higher than F42 (42 ksi).
ASTM A694 F52 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for A694 F52 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) | 260 psi | 675 psi | 1350 psi | 2025 psi | 3375 psi | 5625 psi |
| 300 (149) | 230 psi | 655 psi | 1315 psi | 1970 psi | 3280 psi | 5470 psi |
| 400 (204) | 200 psi | 635 psi | 1270 psi | 1900 psi | 3170 psi | 5280 psi |
| 500 (260) | 170 psi | 600 psi | 1200 psi | 1795 psi | 3000 psi | 4995 psi |
| 600 (316) | 140 psi | 550 psi | 1095 psi | 1640 psi | 2735 psi | 4560 psi |
| 650 (343) | 125 psi | 535 psi | 1075 psi | 1610 psi | 2685 psi | 4480 psi |
Note: Pressure ratings per ASME B16.5. F52's higher yield strength (52 ksi vs 36 ksi for A105) provides greater material strength reserve.
Types of ASTM A694 F52 Flanges Available
ASTM A694 F52 Orifice Flange
ASTM A694 F52 Threaded Flange
ASTM A694 F52 Reducing Flange
ASTM A694 F52 Lap Joint Flange
ASTM A694 F52 Long Weld Neck Flange
ASTM A694 F52 Socket Weld Flange
ASTM A694 F52 Weld Neck Flange
ASTM A694 F52 Blind Flange
ASTM A694 F52 Slip-On Flange
Standard Flange Sizes & Weight Chart
ASTM A694 F52 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 | 0.65 |
| 1" | 124 | 16 | 33 | 54 | 89 | 4 | M16 | 1.35 |
| 2" | 165 | 19 | 60 | 79 | 127 | 8 | M16 | 2.85 |
| 4" | 254 | 24 | 114 | 137 | 200 | 8 | M19 | 8.60 |
| 6" | 318 | 29 | 168 | 197 | 254 | 12 | M22 | 17.2 |
| 8" | 381 | 32 | 219 | 251 | 305 | 12 | M22 | 28.5 |
| 10" | 445 | 35 | 273 | 320 | 370 | 16 | M25 | 42.0 |
| 12" | 521 | 38 | 324 | 362 | 438 | 20 | M25 | 64.0 |
| 16" | 648 | 46 | 419 | 473 | 560 | 20 | M32 | 115.0 |
| 20" | 775 | 51 | 508 | 584 | 673 | 24 | M32 | 180.0 |
| 24" | 915 | 57 | 610 | 681 | 787 | 24 | M38 | 275.0 |
Is ASTM A694 F52 Good Quality for High-Pressure Pipelines?
Yes, the most common grade in the A694 specifications that are used to manufacture high-pressure oil and gas pipeline transmission systems is ASTM A694 F52. The use of the "F52" designation symbolizes the lowest yield strength of 52 ksi (360 MPa), 44 and 24 times better respectively than standard A105 (36 ksi) and F42 (42 ksi), and gives an excellent strength-to-weight ratio and enables optimized pipeline design with either reduced wall thickness or higher operating pressures.
A694 F52 is designed directly to be compatible with API 5L X52 line pipe, the standard grade used in long distance oil and gas transmission line piping in the industry. The result of this metallurgical compatibility is a homogenous mechanical property, weldability as well as performance properties across the entire pipeline system such as pipes, fittings, valves and flanges. The fully-deoxidized steel, hot forging and compulsory heat treatment required by the specification guarantee a constant fine-grained microstructure that has a great deal of notch toughness and would not easily fracture brittlely.
F52 has better mechanical performance than lower grades with good weldability and economic effect. The material is sufficiently strong to operate under high-pressure transmission service (with a maximum of 1440 psi of Class 600 at ambient temperature) and is less expensive than higher grades F60 or F65. Refinement of the grains and precipitation strengthening are as a consequence of the controlled chemical composition with microalloying elements (Nb, V), which give a combination of strength, toughness and weldability most optimal.
The grade is common in wellhead and Christmas tree manifolds, gathering systems, transmission pipelines, offshore platforms and critical pipeline components where high pressure and tough service conditions are necessary. F52 is the best balance between strength, toughness, weldability and cost to be used in mainstream high-pressure pipeline, so it is the most commonly used grade in the A694 specification.
Heat Treatment & Testing Requirements
Heat Treatment Process (Mandatory):
- Normalizing: Heat to austenitizing temperature (900-950-C), cool uniformly in still air
- Normalizing + Tempering: After normalizing, reheat to minimum 540-C (1000-F), hold adequately, air cool
- Quenching + Tempering: Austenitize and quench in suitable liquid, then temper at minimum 540-C (1000-F)
- Tempering Temperature: Minimum 540-C (1000-F) mandatory for all routes
- Holding Time: Adequate soaking time based on thickness (typically 1 hour per inch minimum)
Manufacturing Requirements:
- Melting: Fully-deoxidized melting process (open hearth, electric furnace, or BOF)
- Forging: Hot forging mandatory to develop complete wrought structure
- Prohibited: Cannot be machined from plate or solid bar stock
- Material: Carbon steel or HSLA steel as agreed between purchaser and manufacturer
Testing Requirements:
- Tensile Testing: Yield, tensile, elongation per ASTM A370 - mandatory for each heat
- Hardness Testing: Brinell hardness verification
- PMI Testing: Positive Material Identification to verify grade and chemistry
- Chemical Analysis: Product analysis when specified (Supplementary Requirement)
- Ultrasonic Testing: Per ASTM A388 when specified for critical applications
- Impact Testing: Charpy V-notch when specified for low-temperature service
- Hydrostatic Testing: Per ASTM A961 or MSS SP-44 when specified
ASTM A694 F52 High Yield Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $9 - $24 |
| Weld Neck (WN) | 4" - 8" | 150# | $32 - $130 |
| Weld Neck (WN) | 10" - 24" | 150# | $205 - $780 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $14 - $35 |
| Weld Neck (WN) | 4" - 8" | 300# | $52 - $225 |
| Weld Neck (WN) | 10" - 24" | 300# | $310 - $1,080 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $20 - $52 |
| Weld Neck (WN) | 4" - 8" | 600# | $92 - $335 |
| Weld Neck (WN) | 10" - 24" | 600# | $445 - $1,580 |
| Slip-On (SO) | 1/2" - 2" | 150# | $7 - $20 |
| Slip-On (SO) | 4" - 8" | 150# | $26 - $100 |
| Slip-On (SO) | 10" - 24" | 150# | $165 - $620 |
| Blind (BL) | 1/2" - 2" | 150# | $6 - $18 |
| Blind (BL) | 4" - 8" | 150# | $28 - $105 |
| Blind (BL) | 10" - 24" | 150# | $185 - $745 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $12 - $45 |
| Threaded (TH) | 1/2" - 2" | 150# - 300# | $11 - $38 |
Note: A694 F52 flanges are typically 20-28% higher than A105 and 12-18% higher than F42 due to higher strength material and processing requirements.
Applications of ASTM A694 F52 Flanges in Industry
The ASTM A694 F52 High Yield Pipeline Flanges are commonly used in many industrial applications, and some of the common industries are given below.
Oil & Gas Transmission
Long-distance crude oil pipeline, Natural gas transmission (corresponding to API 5L X52 pipe).
Wellhead Equipment
Christmas tree manifolds, wellhead connections, production manifolds, flowlines.
Offshore Platforms
Pipeline systems Submerged production facilities, riser systems, export lines.
Gas Processing
Gas gathering through high pressure, gas compression plants, gas processing plants, and distribution.
Petrochemical
Pressure hydrocarbon service, process piping, critical pipeline connections.
Refinery
Crude oil pipelines, product pipelines, high process systems- high pressure pipelines, interconnecting piping.
LNG/LPG
LPG pipelines with a high pressure, pipeline distribution systems of propane, butane.
Pipeline Projects
Cross country transmission, interstate pipelines, meter run, pipeline valve stations.
Oil and Gas Production
Production gathering systems, injection line, water flood system, enhanced oil recovery.
Industrial
High-pressure steam systems, hydraulic power systems, pressurized air system.
Why Choose ASTM A694 F52 Flanges from Metinox Overseas?
Metinox Overseas is supplying certified ASTM A694 F52 high-yield pipeline flanges that are subjected to required heat treatment, full traceability to API 5L X52 conformity, and assurance to international pipeline standards. We have certified ISO 9001:2015 and PED facilities and we guarantee that all of our F52 flanges are heat treated by proper cycles of heat treatment that have temperature control, soaking time, and cooling rate measured using calibrated instruments.
Each flange is supplied with EN 10204 3.1B Mill Test Certificates that include full chemical analysis with all alloying elements listed (Cu, Ni, Cr, Mo, V, Nb, B), tensile test results that give yield (minimum 52 ksi) and tensile strength (range 66-85 ksi), elongation values, hardness test results, heat treatment record, actual furnace temperature and holding time and compliance statement(ASTM A694/ASME SA694).
We have a metallurgical lab that has a complete range of testing which includes PMI testing, done using XRF spectroscopy, tensile testing, which is in accordance with ASTM A370, hardness testing, and optional Charpy impact testing at a given temperature in case of low temperature service work. We have certified reference materials and are enrolled in interlaboratory comparison programs in order to guarantee the accuracy of testing.
Having a long history of providing A694 F52 flanges to large-scale pipeline projects in various place globally, our technical team provides expert advice on the use of materials to meet API 5L X52 compliance, welding of high-yield steel to meet API 1104, compliance with ASME B31.4 (liquid petroleum), B31.8 (gas transmission), and B31.3 (process piping), and the requirements of sour service per NACE MR0175.
We also keep F52 flanges 1/2 through 48 NB in 150 through 2500 pressure classes with expedited heat treating, special testing requests and expedited delivery to meet urgent pipeline construction and maintenance needs. Catering to major oil and gas operators, EPC contractors and pipeline constructions companies in more than 60 countries with competitive pricing, quality reliability and delivery at the right time.
ASTM A694 F52 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, Bahrain | 7-12 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg, Antwerp, Southampton, Felixstowe | 22-28 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York, Los Angeles, Vancouver, Montreal | 28-35 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang, Manila, Jakarta, Bangkok | 12-18 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban, Mombasa, Alexandria | 18-25 Days | CIF Lagos / CIF Durban |
| South America | Santos, Buenos Aires, Callao | 32-40 Days | CIF Santos / CIF Buenos Aires |
| Australia | Melbourne, Sydney, Brisbane | 25-32 Days | CIF Melbourne / CIF Sydney |
Other Types of High Yield A694 F52 Flanges
ASTM A694 F52 High Yield Flanges, Pipeline A694 F52 Weld Neck Flanges, SA694 F52 Slip-On Flanges, ASME A694 F52 Blind Flanges, A694 F52 Socket Weld Flanges, A694 F52 Threaded Flanges, ANSI B16.5 A694 F52 Lap Joint Flanges, High Yield A694 F52 Orifice Flanges, A694 F52 Long Weld Neck Flanges, ASTM A694 F52 Reducing Flanges, A694 F52 Class 150 Flanges, A694 F52 Class 300 Flanges, A694 F52 Class 600 Flanges, A694 F52 RTJ Flanges, A694 F52 WNRF Flanges.
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Frequently Asked Questions (FAQ)
F52 is stronger (52 ksi, 42 ksi around 24 times higher) and is generally slightly higher in carbon and manganese. F52 has higher material strength reserve to support the high-pressure pipelines and comparable with API 5L X52 pipe, F42 is similar to X42 pipe. The F52 is more popular with mainstream transmission pipeline.
F52 is the best strength, toughness, and weldable at low cost and is used in high pressure pipeline. It offers much greater strength than A105 (44% greater yield) at the same time being economical when compared to F60/F65. It is equal to the industry standard API 5L X52 pipe grade deployed in the world to transport oil and gas.
It can, however, not be the best system performance. The flanges used must be equal to the pipe, F52 with X52, F60 with X60. Although flanges of lower grade are used in combination with higher grade pipe, there is a mismatch of mechanical properties and it may not satisfy the requirements of the design code of a pipeline system that the system shall have uniform strength.
The normal range of Carbon Equivalent is 0.43-0.45% based on what the purchaser requires and code of the pipeline used. CE equals: CE = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15. Reduced values of CE provide improved weldability to field welding of pipeline systems.
Impact testing is optional according to ASTM A694, but can be required by purchaser in low-temperature service, or other critical service. When given, normal requirement is Charpy V-notch testing at minimum design temperature which is frequently 27 J (20 ft-lbf) average at 0-C or less.
F52 is stronger in the yield (52 ksi vs 38 ksi, or 37% better) but A516 Gr 70 is strongest in the maximum tensile (90 ksi vs 85 ksi). F52 is used in the transmission service of pipeline equal to API 5L-pipe; A516 Gr 70 is used in pressure vessels. Varied applications that need varied requirements.
Preheat normally 120-150-C (250-300-F) when the thickness is more than 25mm, and greater when thicker sections are used or restrained. Precise preheat varies based on carbon equivalent, thickness, ambient temperature and hydrogen content of electrode based on API 1104 or ASME Section IX. Always follow qualified WPS.
Yes, with due specification and testing. Indicate compliance with NACE MR0175/ISO 15156 and presence of HIC testing (according to NACE TM0284), maximum hardness =22 HRC, product analysis and sour service documentation. Material should exhibit resistance against SSC (Sulfide Stress Cracking) and HIC (Hydrogen Induced Cracking).
API 5L PSL 2 (Product Specification Level 2) has stricter requirements than the PSL 1, such as a requirement of Charpy impact testing, stricter limits of chemistry, a requirement of nondestructive testing, and limited amounts of carbon equivalent. In the case of a match of API 5L X52 PSL 2 pipe, indicate the same requirements in A694 F52 flanges.
Stock goods which are normally tempering/normalizing: 6-8 days ex-works. Made-to-order: 5-6 weeks of forging, heat treatment (normalizing cycle no less than 3-4 days) required, mechanical testing, chemical analysis and documentation. The expedited heat treatment has been offered in the case of urgent needs where the lead time of 2-3 weeks is possible on standard sizes.
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