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WN Flange
SDFL
The F310S welding neck flange is a forged butt weld flange engineered for high-temperature piping systems including boiler circuits, flue gas lines, and high-temperature steam pipelines. Manufactured from high chromium-nickel heat-resistant stainless steel, it supports multiple global industry standards and covers dimensional requirements from DN15 to DN4000 via precision CNC machining. It is widely selected by industrial clients for thermal power, petrochemical, and waste gas treatment projects that demand consistent performance under sustained high-heat conditions.
F310S is a high chromium-nickel austenitic stainless steel specified under ASTM A182 standards. Its alloy formulation provides oxidation resistance at continuous operating temperatures up to 1050℃, reducing surface peeling caused by long-term exposure to high-temperature flue gas. Compared with standard 304 stainless steel, F310S retains structural integrity at higher temperatures, addressing common issues such as material softening and oxidation cracking that occur in conventional stainless steel flanges under elevated heat. This material has a low thermal expansion coefficient, which supports dimensional stability during heating and cooling cycles. This characteristic reduces the risk of bolt loosening and gasket displacement caused by thermal deformation, supporting stable sealing performance over repeated temperature fluctuations. The reinforced arc neck design distributes heat evenly and reduces local high-temperature stress concentration.
The standard F310S weld neck flange carries a PN20 (2.0MPa) working pressure rating for high-temperature service. Its sealing face is processed via precision lapping to maintain flatness at elevated temperatures, and it is compatible with high-temperature graphite gaskets for steam and flue pipe applications. The weld end features a full-penetration bevel design, which lowers the risk of brittle fracture at weld joints under sustained heat. Standard stock sizes cover DN20 to DN500, with custom dimensions available from DN15 up to DN4000. Custom surface treatments and alloy composition adjustments are available upon request for specialized high-temperature applications.
This product conforms to multiple global flange standards including ASME, EN, ISO, JIS, and custom project specifications. It supports cross-regional commercial procurement and engineering matching across different standard systems.
LANGE TYPE | PLATE FLANGE、WELDED NECK FLANGE、BLIND FLANGE、THREADERD FLANGE、 SLIDE FLANGE、SOCKET WELDING FLANGE、DISINFECTION POTT FLANGE、FLE XIBLE JOINT FLANGE、TUBE SHEET、 LARGE DIAMETER FLANGE、PRIESS FLANG E、 PRESSURE VESSEL FLANGE、LAP FLANGE、BUTTERFLYVALVE FLANGE. |
IPE FITTING IMENSIONS | MAXIMUM OUTER DIAMETER: 6000 |
RESURE | 150 #-2500 #, PN0.6-PN400, 5k-40k |
EALING SURFACE | RF,FF,RTJ,GROOVE,CUSTOMIZABLE |
PECIFICATION | GOST 12820-80 / ANSI B16.5 / EN1092 / BS4504 / JIS B2220-2012 / DIDN/ AMSE B16.5 / UNI-MULTIPLE STANDARDS COMPLIANCE! |
ALL THICKNESS ATERIAL URFACE TREATMENT | SCH5S、SCH10S、SCH10、SCH40S、SCH20、SCH30、SCH40、SCH60、 SCH80、SCH160 |
STAINLESS STEEL: A182F304/304L、A182 F316/316L、A182F321、A182F310S、 A182F347H、A182F316T1、317/317L、904L、1.4301、1.4307, 1.4401、1.44571、 1.4541、254MO。 CARBON STEEL: A105、A350LF2、S235JR、S275JR、ST37、ST45.8、A42CP、 A48CP、E24、A515 GR60、A515 GR70。 | |
DUPLEX STAINLESS STEEL:UNS31803、SAF2205、UNS32205、UNS31500、UN S32750、UNS32760、1.4462、1.4410、1.4501。 LINE PIPE STEEL: A694 F42、A694F52、A694 F60、A694 F65、A694F70、A694F80。 | |
NICKEL ALLOY: INCONEL600、 INCONEL625、 INCONEL690、INCOLOY800O、INCO LOY825、INCOLOY800H、C22、C-276、MONEL400、ALLOY200。 CR-MO ALLOY: A182F11、A182F5、A182F22、A182F91、A182F9、16MO3、15CR MO。 | |
WIDELY USED IN THE PETROCHEMICAL INDUSTRY, PHARMACEUTICAL INDUSTRRY, WASTE GAS SYSTEM, POWER PLANTS, SHIPBUILDING, WATER TREATMENT, AND SO ON. | |
Nom. Pipe Size | O | T | R | x | No./Dia. of Holes | Bolt Circle Dia | L2 | H | B2 | L | B | L3 | B3 | D | c | Thr | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1/2 | 3.75 | 0.56 | 1.38 | 1.5. | 4-0.62 | 2.62 | 2.06 | 0.84 | 0.62 | 0.88 | 0.88 | 0.12 | 0.88 | 0.90 | 0.38 | 0.93 | 0.62 |
3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 4-0.75 | 3.25 | 2.25 | 1.05 | 0.82 | 1.00 | 1.09 | 0.12 | 1.00 | 1.11 | 0.44 | 1.14 | 0.62 |
1 | 4.88 | 0.69 | 2.00 | 2.12 | 4-0.75 | 3.50 | 2.44 | 1.32 | 1.05 | 1.06 | 1.36 | 0.12 | 1.06 | 1.38 | 0.50 | 1.41 | 0.69 |
1-1/4 | 5.25 | 0.75 | 2.50 | 2.50 | 4-0.75 | 3.88 | 2.56 | 1.66 | 1.38 | 1.06 | 1.70 | 0.19 | 1.06 | 1.72 | 0.56 | 1.75 | 0.81 |
1-1/2 | 6.12 | 0.81 | 2.88 | 2.75 | 4-0.88 | 4.50 | 2.69 | 1.90 | 1.61 | 1.19 | 1.95 | 0.25 | 1.19 | 1.97 | 0.62 | 1.99 | 0.88 |
2 | 6.50 | 0.88 | 3.62 | 3.31 | 8-0.75 | 5.00 | 2.75 | 2.38 | 2.07 | 1.31 | 2.44 | 0.31 | 1.31 | 2.46 | 0.69 | 2.50 | 1.12 |
2-1/2 | 7.50 | 1.00 | 4.12 | 3.94 | 8-0.88 | 5.88 | 3.00 | 2.88 | 2.47 | 1.50 | 2.94 | 0.31 | 1.50 | 2.97 | 0.75 | 3.00 | 1.25 |
3 | 8.25 | 1.12 | 5.00 | 4.62 | 8-0.88 | 6.62 | 3.12 | 3.50 | 3.07 | 1.69 | 3.57 | 0.38 | 1.69 | 3.60 | 0.81 | 3.63 | 1.25 |
3-1/2 | 9.00 | 1.19 | 5.50 | 5.25 | 8-0.88 | 7.25 | 3.19 | 4.00 | 3.55 | 1.75 | 4.07 | 0.38 | 1.75 | 4.10 | / | 4.13 | 1.44 |
4 | 10.00 | 1.25 | 6.19 | 5.75 | 8-0.88 | 7.88 | 3.38 | 4.50 | 4.03 | 1.88 | 4.57 | 0.44 | 1.88 | 4.60 | / | 4.63 | 1.44 |
5 | 11.00 | 1.38 | 7.31 | 7.00 | 8-0.88 | 9.25 | 3.88 | 5.56 | 5.05 | 2.00 | 5.66 | 0.44 | 2.00 | 5.69 | I | 5.69 | 1.69 |
6 | 12.50 | 1.44 | 8.50 | 8.12 | 12-0.88 | 10.62 | 3.88 | 6.63 | 6.07 | 2.06 | 6.72 | 0.50 | 2.06 | 6.75 | I | 6.75 | 1.81 |
8 | 15.00 | 1.62 | 10.62 | 10.25 | 12-1.00 | 13.00 | 4.38 | 8.63 | 7.98 | 2.44 | 8.72 | 0.50 | 2.44 | 8.75 | } | 8.75 | 2.00 |
10 | 17.50 | 1.88 | 12.75 | 12.62 | 16-1.12 | 15.25 | 4.62 | 10.75 | 10.02 | 2.62 | 10.88 | 0.50 | 3.75 | 10.92 | I | 10.88 | 2.19 |
12 | 20.50 | 2.00 | 15.00 | 14.75 | 16-1 25 | 17.75 | 5.12 | 12.75 | 12.00 | 2.88 | 12.88 | 0.50 | 4.00 | 12.92 | / | 12.94 | 2.38 |
14 | 23.00 | 2.12 | 16.25 | 16.75 | 20-1.25 | 20.25 | 5.62 | 14.00 | 13.25 | 3.00 | 14.14 | 0.50 | 4.38 | 14.18 | I | 14.19 | 2.50 |
16 | 25.50 | 2.25 | 18.50 | 19.00 | 20-1.38 | 22.50 | 5.75 | 16.00 | 15.25 | 3.25 | 16.16 | 0.50 | 4.75 | 16.19 | / | 16.19 | 2.69 |
18 | 28.00 | 2.38 | 21.00 | 21.00 | 24-1.38 | 24.75 | 6.25 | 18.00 | 17.25 | 3.50 | 18.18 | 0.50 | 5.12 | 18.20 | } | 18.19 | 2.75 |
20 | 30.50 | 2.50 | 23.00 | 23.12 | 24-1.38 | 27.00 | 6.38 | 20.00 | 19.25 | 3.75 | 20.20 | 0.50 | 5.50 | 20.25 | I | 20.19 | 2.88 |
22 | 33.00 | 2.63 | 25.25 | 25.25 | 24-1.63 | 29.25 | 6.50 | 22.00 | 21.25 | 4.00 | 22.22 | 0.50 | 5.75 | 22.25 | I | 22.19 | 3.13 |
24 | 36.00 | 2.75 | 27.25 | 27.62 | 24-1.62 | 32.00 | 6.62 | 24.00 | 23.25 | 4.19 | 24.25 | 0.50 | 6.00 | 24.25 | / | 24.19 | 3.25 |
The F310S flange is produced via alloy forging followed by high-temperature stabilization treatment. Advanced CNC machining systems deliver micron-level dimensional accuracy, ensuring consistent interchangeability across large-batch orders. The sealing face undergoes precision lapping to meet flatness requirements for high-temperature service. All high-temperature flanges undergo high-temperature endurance testing before delivery to verify performance under rated working conditions.
The manufacturing facility holds ISO 9001, ISO 14001, ISO 45001, CE, and TS certifications. Each order is supplied with a complete material test report, and the product comes with an 18-month warranty for high-heat service, covering material and manufacturing defects under rated operating parameters.
This F310S welding neck flange serves industrial sectors including petrochemical processing, pharmaceutical production, waste gas treatment systems, thermal power plants, shipbuilding, and water treatment. It is particularly suited for boiler flue gas pipelines, high-temperature steam mains, heat treatment equipment, and furnace piping systems where conventional stainless steel flanges cannot support long-term operation. For commercial procurement in power generation and boiler manufacturing, this flange reduces maintenance frequency associated with oxidation and seal failure, supporting longer service intervals for high-temperature piping systems.
No. Standard F304 stainless steel is prone to oxidation and cracking when exposed to temperatures above 550℃ for extended periods. F310S is formulated for sustained service at higher temperatures and is the appropriate option for flue gas and boiler piping operating above 550℃.
The standard stock model carries a PN20 (2.0MPa) pressure rating. Custom higher pressure classes can be produced based on project specifications and material thickness adjustments.
Yes. Standard stock covers DN20 to DN500. Custom dimensions from DN15 up to DN4000 are available, along with custom pressure classes, sealing face types, and surface treatments to match project requirements.
Each shipment includes a full material test report covering chemical composition and mechanical properties, with high-temperature endurance test records available upon request.
