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Industrial Stainless Steel Flanges, Customized for Your Successful Connection
We specialize in the full-process manufacturing of stainless steel flanges, strictly following your designs and specifications. Senior engineers are involved throughout the entire process to ensure that each corrosion-resistant, high-strength flange meets the standards precisely and integrates seamlessly into your system. We are committed to improving the performance of your equipment and the efficiency of your projects with highly reliable stainless steel flanges. For an efficient and economical customized manufacturing solution, please contact us immediately!
1.Full Material Coverage
We offer a wide range of materials, including stainless steel, carbon steel, nickel alloys, Hastelloy, and copper-nickel alloys, suitable for harsh operating conditions such as high temperatures, high pressures, and strong corrosion.
2.Precision Manufacturing Processes
We strictly adhere to international standards (ANSI/ASME/DIN) and use CNC machining to ensure the precision of sealing surfaces and structural strength, eliminating the risk of leakage.
3.Rapid Delivery Capability
With our own flexible production facilities, we maintain a stock of standard flanges and can efficiently respond to urgent orders, thereby shortening project timelines.
4.Customized Solutions
We support non-standard dimensions, special pressure ratings, and composite material requirements, providing selection guidance and technical support for process conditions.
| Flange Type | DN |
Outer Diameter (OD) ±Tol |
Bolt Circle Diam. (PCD) ±Tol |
Thickness (Thk) ±Tol |
Bolt Holes (Qty×Dia) |
Neck Height (H) ±Tol |
RF Face Height ±Tol |
Pressure Rating |
Working Press. (MPa) |
Weight (kg) |
| WN 150# | 50 | 165 ±0. 8 | 125 ±0. 5 | 16 ±0. 3 | 4×19 | 45 ±0. 5 | 2. 0 ±0. 1 | Class 150 | 1. 96 | 2. 1 |
| SO 300# | 80 | 200 ±1. 0 | 160 ±0. 6 | 19 ±0. 4 | 8×19 | 52 ±0. 5 | 2. 5 ±0. 1 | Class 300 | 5. 1 | 3. 8 |
| PL PN16 | 100 | 220 ±1. 2 | 180 ±0. 6 | 20 ±0. 4 | 8×22 | 56 ±0. 5 | 2. 0 ±0. 1 | PN16 | 1. 6 | 4. 5 |
| SW PN40 | 65 | 185 ±0. 8 | 145 ±0. 5 | 22 ±0. 4 | 4×22 | 48 ±0. 5 | 3. 0 ±0. 2 | PN40 | 4 | 3. 2 |
| BL 600# | 40 | 152 ±0. 6 | 108 ±0. 4 | 25 ±0. 5 | 4×19 | 42 ±0. 5 | - | Class 600 | 10. 2 | 2. 8 |
| LWN PN25 | 150 | 280 ±1. 5 | 240 ±0. 8 | 24 ±0. 5 | 8×26 | 62 ±0. 8 | 3. 0 ±0. 2 | PN25 | 2. 5 | 8. 6 |
| TH 900# | 32 | 140 ±0. 6 | 102 ±0. 4 | 30 ±0. 5 | 4×19 | 38 ±0. 5 | 2. 5 ±0. 1 | Class 900 | 15. 3 | 2. 5 |
| LF PN10 | 200 | 340 ±1. 8 | 295 ±1. 0 | 22 ±0. 4 | 12×26 | 50 ±0. 5 | 1. 5 ±0. 1 | PN10 | 1 | 12. 4 |
| FF 150# | 125 | 270 ±1. 2 | 210 ±0. 7 | 22 ±0. 4 | 8×22 | 58 ±0. 5 | 2. 0 ±0. 1 | Class 150 | 1. 96 | 6. 2 |
| ORF 300# | 100 | 235 ±1. 0 | 190 ±0. 6 | 30 ±0. 5 | 8×22 | 60 ±0. 8 | 4. 8 ±0. 2 | Class 300 | 5. 1 | 9. 1 |
Tolerance Standard Specifications
|
Parameter |
Tolerance Range (mm) |
Applicable Standard |
|
Outer Diameter (OD) |
±(0. 1%×OD +0. 5) ≤ ±2. 0 |
ASME B16. 5 Table 5 |
|
PCD |
±0. 25 (DN≤100) / ±0. 5 (DN>100) |
EN 1092-1 Annex D |
|
Thickness (Thk) |
+2. 0/-0. 0 (PN≤40) / +3. 0/-0. 0 (High Pressure) |
ASME B16. 5 §6. 4. 4 |
|
Neck Height (H) |
±1. 0 |
DIN 2633 Type 11 |
|
RF Face Height |
±0. 1 (Ra≤3. 2μm) |
MSS SP-44 §7. 3 |
Flange Type Classification
|
Abbr. |
Full Name |
Application |
|
WN |
Welding Neck Flange |
High-pressure pipelines, critical systems |
|
SO |
Socket Weld Flange |
Small-bore piping, instrumentation lines |
|
PL |
Plate Flat Flange |
Low-pressure applications, cost-effective |
|
SW |
Screwed Flange |
Non-welded connections, maintenance sections |
|
BL |
Blind Flange |
Pipe end closures, pressure testing |
|
LWN |
Long Welding Neck Flange |
High-temperature/pressure vessels |
|
TH |
Threaded Flange |
Compressed gas systems |
|
LF |
Lapped Joint Flange |
Corrosive media, frequent disassembly |
|
FF |
Flat Face Flange |
Soft gasket materials, low-pressure seals |
|
ORF |
Raised Face Flange |
Standard for ASME Class 150-2500 systems |
High-Temperature Pressure Derating Factors
|
Material/Temp (°C) |
150°C |
300°C |
450°C |
600°C |
|
F304 |
1. 00 |
0. 92 |
0. 85 |
0. 65 |
|
F316L |
1. 00 |
0. 95 |
0. 90 |
0. 75 |
|
F321 |
1. 00 |
0. 97 |
0. 93 |
0. 80 |
Note: Actual working pressure = Tabulated pressure × derating factor
If you are interested in our products or you wanna make and customize products, please feel free to contact us.
Such as carbon steel, alloy steel, stainless steel, etc., commonly used to manufacture pipe parts, flanges, tees, and elbows.
High-temp/corrosion resistance. Critical in aerospace/chemical processing. Used for reactor tubes, valves, and flanges.
Extreme corrosion resistance (acids/halogens). Essential for harsh chemical/petrochemical environments. Made into reactors, exchanger tubes.
Superior seawater corrosion/biofouling resistance. Key for marine/offshore/desalination. Common in condenser/seawater pipes and fittings.
Excellent electrical/thermal conductivity, ductility, and corrosion resistance. Widely used in electrical wiring, heat exchangers, roofing, and plumbing.
An alloy of copper and zinc, known for its good machinability and corrosion resistance, is commonly used for manufacturing valves, pipes, and other components.
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