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Our industrial flanges are engineered to provide a secure, leak-proof connection point for piping systems, pressure vessels, and heavy machinery. Manufactured through high-quality forging or precision plate cutting, these components are designed to facilitate easy assembly, maintenance, and inspection of critical fluid and gas infrastructure.
1. Common Flange Types
We offer a complete range of configurations to suit various structural and pressure requirements:
Weld Neck (WN):Ideal for high-pressure and extreme temperature applications.
Slip-On (SO):Easy to install; preferred for low-pressure systems.
Blind (BL):Used to seal the end of a piping system or vessel opening.
Socket Weld (SW):Best for small-diameter, high-pressure piping.
Threaded (TH):For systems where welding is not permitted (NPT/BSPT).
Lap Joint (LJ):Used in systems requiring frequent dismantling for cleaning.
Spectacle Blind / Figure-8:For permanent or temporary isolation of pipelines.
2. Technical Specifications & Pressure Ratings
Size Range:1/2" to 120" (DN15 – DN3000).
Pressure Classes (ASME):Class 150, 300, 600, 900, 1500, 2500.
Pressure Ratings (PN/DIN):PN6, PN10, PN16, PN25, PN40, PN64, PN100.
Flange Facings:Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Tongue & Groove (T&G).
3. Material Grades & Standards
We provide flanges in a wide spectrum of materials to match your pipeline's chemical and mechanical needs:
Carbon Steel:ASTM A105, A105N, ST37.2, C22.8.
Stainless Steel:ASTM A182 F304/304L, F316/316L, F321, F310S, F347.
Alloy Steel:ASTM A182 F1, F5, F9, F11, F22, F91.
Low Temperature:ASTM A350 LF2, LF3.
Duplex Steel:ASTM A182 F51, F53, F55, S31803, S32205.
High Yield:ASTM A694 F42, F52, F60, F65, F70.
4. International Manufacturing Standards
All flanges are produced and strictly tested in accordance with global industry requirements:
ASME/ANSI B16.5 / B16.47(Series A & B)
DIN / EN 1092-1(European Flange Standard)
JIS B2220(Japanese Industrial Standard)
MSS-SP-44 / API 6A(High-Pressure Pipeline Flanges)
5. Quality Assurance & Surface Protection
Manufacturing Process:100% Forged (Closed Die or Open Die) to ensure superior grain structure.
Testing:Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), and Hardness Testing.
Surface Treatment:Anti-rust Oil, Yellow/Black Painting, Hot-dip Galvanized, or Cold Galvanized.
Certification:Fully compliant withMTC (EN 10204 3.1); third-party inspection (SGS, TUV, BV) available upon request.
Packaging:Securely packed in seaworthy plywood cases or on treated wooden pallets with protective caps for the flange faces.
Welding Neck WN Flange Specification:
| Standard | Type | Class | Size |
| ASME B16.5 | WN/LWN/SO/Blind/Lap Joint | 150#-2500# |
1/2"-24"(Except Blind Flange 2500Ib 1/2"-12") |
|
ASME B16.47 Series A |
WN/blind flange | 150#-900# | 22"-48"(Except 900#Size:26"-48") |
|
ASME B16.47 Series B |
WN/blind flange | 75#-300# | 26"-48" |
|
400#600# 900# |
26"-36" | ||
| EN1092-1:2002 |
Plate flange for welding/loose plate flange with weld-on plate collar or for lapped pipe end/Blind/WN flange |
PN2.5-PN100 | DN10-DN4000 |
| JIS B2220 |
Welding Flange,Lap joint flange, threaded flange |
PN6-PN100 | DN10-DN1500 |
|
BS4504 BS10 TableD/E |
Plate Flange for welding/WN flange/Blank Flange |
PN6-PN100 | DN10-DN1500 |
| Sealing Surface | RF FF RTJ TF GF LF LM | ||
| Flange Face Finish | Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers) | ||
| 125-250 AARH(it is called smooth finish) | |||
| 250-500 AARH(it is called stock finish) | |||
| Coating | Vanish,yellow paint,anti-rust oil,galvanizing etc | ||
WN Flange Material Grades:
| Carbon Steel | ASTM IASME A/SA105(N),A350 LF2/LF3,A694 F52,F56,F60,F65,F70 |
| Alloy Steel | ASTM/ASME A/SA 182 F5,F9,F11,F22,F91 |
| Stainless Steel |
ASTM/ASME A/SA 182 F304,304L,304H,310H,316,316H, 316L,316LN,316Ti,317,317L,321,321H,347,347H,904L |
|
Duplex and Super Duplex |
ASTM/ASME A/SA 182 F44,F45,F51,F53,F55,F60,F61, S31803,S32205,S32550,S31254,SMO254,S32750,S32760,S32950 |
| Nickel Alloy Steel |
ASTM/ASME B/SB 564 UNS N02200(NICKEL 200),UNS N04400,(MONEL
400) UNS N08825(INCOLOY 825),UNS N06600(INCONEL600),UNS N06601(INCONEL 601), UNS N06625(INCONEL625),UNS N10276(HASTELLOY C276) |
| ASTM/ASME B/SB160 UNS N02201(NICKEL201),ASTM B/SB472 UNS N08020(Alloy 20) | |
| Copper Alloy | ASTM/ASME B/SB151 UNS N07060,71500,C70600(CuNi 90/10),C71500(CuNi 70/30) |
| Titanium | ASTM/ASME B/SB381 Grade 2,Grade 5,Grade 7 |
WN Flange Production Process
They usually do so when maintenance access, assembly convenience, or equipment connection makes removability valuable. The decision is often operational as much as technical. Typical long-tail contexts include ASME B16.5 flange supply, weld neck flange for high-pressure piping, and carbon steel flanges for oil and gas projects.
Differences often come from facing type, material route, testing scope, machining quality, and whether the quote reflects project-grade documentation or routine stock supply. Buyers are often comparing more than a shape and pressure class. This often becomes obvious in ANSI flange supply for process piping where facing type, class, and document scope change the quote more than buyers expect.
A practical question is whether the connection is for field assembly, equipment tie-in, or a section that may need future access. That usually helps narrow the most sensible flange style. That question is especially useful in equipment tie-ins, field assembly joints, and pressure piping connections for process plants.
They often overlook facing compatibility, bolt pattern coordination, and how the flange will match the connected gasket and pipe system. Those details can delay installation more than the flange type itself. Installation delays are common in weld neck and slip-on flange orders where facing compatibility and gasket matching were not confirmed early.
Welding Neck WN Flange Specification:
| Standard | Type | Class | Size |
| ASME B16.5 | WN/LWN/SO/Blind/Lap Joint | 150#-2500# |
1/2"-24"(Except Blind Flange 2500Ib 1/2"-12") |
|
ASME B16.47 Series A |
WN/blind flange | 150#-900# | 22"-48"(Except 900#Size:26"-48") |
|
ASME B16.47 Series B |
WN/blind flange | 75#-300# | 26"-48" |
|
400#600# 900# |
26"-36" | ||
| EN1092-1:2002 |
Plate flange for welding/loose plate flange with weld-on plate collar or for lapped pipe end/Blind/WN flange |
PN2.5-PN100 | DN10-DN4000 |
| JIS B2220 |
Welding Flange,Lap joint flange, threaded flange |
PN6-PN100 | DN10-DN1500 |
|
BS4504 BS10 TableD/E |
Plate Flange for welding/WN flange/Blank Flange |
PN6-PN100 | DN10-DN1500 |
| Sealing Surface | RF FF RTJ TF GF LF LM | ||
| Flange Face Finish | Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers) | ||
| 125-250 AARH(it is called smooth finish) | |||
| 250-500 AARH(it is called stock finish) | |||
| Coating | Vanish,yellow paint,anti-rust oil,galvanizing etc | ||
WN Flange Material Grades:
| Carbon Steel | ASTM IASME A/SA105(N),A350 LF2/LF3,A694 F52,F56,F60,F65,F70 |
| Alloy Steel | ASTM/ASME A/SA 182 F5,F9,F11,F22,F91 |
| Stainless Steel |
ASTM/ASME A/SA 182 F304,304L,304H,310H,316,316H, 316L,316LN,316Ti,317,317L,321,321H,347,347H,904L |
|
Duplex and Super Duplex |
ASTM/ASME A/SA 182 F44,F45,F51,F53,F55,F60,F61, S31803,S32205,S32550,S31254,SMO254,S32750,S32760,S32950 |
| Nickel Alloy Steel |
ASTM/ASME B/SB 564 UNS N02200(NICKEL 200),UNS N04400,(MONEL
400) UNS N08825(INCOLOY 825),UNS N06600(INCONEL600),UNS N06601(INCONEL 601), UNS N06625(INCONEL625),UNS N10276(HASTELLOY C276) |
| ASTM/ASME B/SB160 UNS N02201(NICKEL201),ASTM B/SB472 UNS N08020(Alloy 20) | |
| Copper Alloy | ASTM/ASME B/SB151 UNS N07060,71500,C70600(CuNi 90/10),C71500(CuNi 70/30) |
| Titanium | ASTM/ASME B/SB381 Grade 2,Grade 5,Grade 7 |
WN Flange Production Process
They usually do so when maintenance access, assembly convenience, or equipment connection makes removability valuable. The decision is often operational as much as technical. Typical long-tail contexts include ASME B16.5 flange supply, weld neck flange for high-pressure piping, and carbon steel flanges for oil and gas projects.
Differences often come from facing type, material route, testing scope, machining quality, and whether the quote reflects project-grade documentation or routine stock supply. Buyers are often comparing more than a shape and pressure class. This often becomes obvious in ANSI flange supply for process piping where facing type, class, and document scope change the quote more than buyers expect.
A practical question is whether the connection is for field assembly, equipment tie-in, or a section that may need future access. That usually helps narrow the most sensible flange style. That question is especially useful in equipment tie-ins, field assembly joints, and pressure piping connections for process plants.
They often overlook facing compatibility, bolt pattern coordination, and how the flange will match the connected gasket and pipe system. Those details can delay installation more than the flange type itself. Installation delays are common in weld neck and slip-on flange orders where facing compatibility and gasket matching were not confirmed early.
