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- Carbon & Carbon Alloy Steel
- Stainless Steel
- Copper & Nickel Alloy
- Heat Efficiency Tubes
- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
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China Flange Suppliers | High-Quality Carbon Steel, Stainless Steel, and Alloy Steel Flanges from Factory
Carbon Steel Flanges
Material Grades
- ASTM A105 — Forged carbon steel for high-temperature service
- ASTM A350 LF1 / LF2 / LF3 — Low-temperature carbon steel
- ASTM A694 F42–F80 — High-yield carbon steel for pipeline applications
Size Range
- Diameter: ½" to 60" (or larger for custom orders)
- Pressure Ratings: Class 150 to Class 2500 (ASME B16.5), PN 2.5 to PN 400 (EN 1092-1)
Key Standards
- ASME B16.5 — Pipe flanges up to 24" NPS
- ASME B16.47 — Large-diameter flanges, Series A & B
- EN 1092-1 — European standard for PN-rated flanges
- MSS SP-44 — Steel pipeline flanges
Applications
- Oil & gas pipelines
- Petrochemical plants
- Power generation (non-corrosive environments)
Stainless Steel Flanges
Material Grades
- Austenitic: ASTM A182 F304 / 304L, F316 / 316L, F321
- Duplex / Super Duplex: ASTM A182 F51 (2205), F53 (2507)
- Martensitic: ASTM A182 F6a (410)
Size Range
- Diameter: ½" to 48" (standard), larger sizes available
- Pressure Ratings: Class 150 to Class 2500 (ASME B16.5), PN 6 to PN 100 (EN 1092-1)
Key Standards
- ASME B16.5 / B16.47 — Standard and large-diameter flanges
- EN 1092-1 — European PN/DIN flanges
- API 6A — Wellhead and Christmas tree flanges for oilfields
Applications
- Chemical processing
- Food & pharmaceutical industries
- Marine and corrosive environments
Alloy Steel Flanges
Material Grades
- Chromium-Molybdenum (Cr-Mo): ASTM A182 F11, F22, F91 — high-temperature service
- Nickel Alloys: ASTM B564 (Inconel 625, Monel 400, Hastelloy C276)
- Low-Temp Alloys: ASTM A522 — for cryogenic applications
Size Range
- Diameter: ½" to 48" (standard)
- Pressure Ratings: Class 150 to Class 2500
Key Standards
- ASME B16.5 / B16.47
- ASTM A182 — Forged alloy flanges
- NACE MR0175 — For sour service in oil & gas
Applications
- High-temperature / pressure steam systems (power plants)
- Refineries and sour gas pipelines
- Cryogenic storage (LNG)
⚙️ Manufacturing Processes
- Forging (ASTM A105, A182) — High strength, preferred for critical applications.
- Casting (ASTM A216 WCB) — Economical for large sizes but less robust than forged flanges.
- Plate Cutting (ASME B16.48 for spectacle blinds) — Used for slip-on and blind flanges.
🔩 Common Flange Types
Weld Neck (WN)
High integrity for high-pressure systems.
Slip-On (SO)
Easy alignment, lower cost.
Blind (BL)
Used to seal pipe ends.
Socket Weld (SW)
For small-diameter, high-pressure piping.
Lap Joint (LJ)
Used with stub ends for easy disassembly.
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Frequently Asked Questions (FAQ)
What is the difference between carbon steel and stainless steel flanges?
Carbon steel flanges (e.g., ASTM A105) are cost-effective and suitable for high-temperature, non-corrosive environments such as oil & gas pipelines and power plants. Stainless steel flanges (e.g., ASTM A182 F304/F316) offer superior corrosion resistance, making them ideal for chemical processing, food & pharmaceutical, and marine applications.
Which flange material is recommended for cryogenic or low-temperature service?
For low-temperature service, ASTM A350 LF1/LF2/LF3 carbon steel flanges or ASTM A522 alloy steel flanges are recommended. These materials are specifically designed to maintain toughness and integrity at sub-zero temperatures, including LNG cryogenic storage applications.
What pressure classes are available for steel flanges?
Steel flanges are available in pressure ratings from Class 150 to Class 2500 per ASME B16.5, and PN 2.5 to PN 400 per EN 1092-1. The appropriate pressure class depends on the operating temperature, pressure, and fluid type in your pipeline system.
What is the advantage of forged flanges over cast flanges?
Forged flanges (ASTM A105, A182) have a denser grain structure, resulting in higher strength, better fatigue resistance, and greater reliability in critical applications. Cast flanges (ASTM A216 WCB) are more economical and suitable for larger sizes where extreme mechanical performance is not required.
Which flange type is best for high-pressure piping systems?
Weld Neck (WN) flanges are the preferred choice for high-pressure and high-temperature piping systems. Their long tapered hub provides excellent stress distribution and structural integrity. Socket Weld (SW) flanges are also suitable for small-diameter, high-pressure applications.
Can you supply custom-size flanges beyond standard ranges?
Yes. While standard sizes range from ½" to 48"–60" in diameter, we can manufacture custom flanges for special project requirements. Large-diameter flanges beyond standard ranges are available per ASME B16.47 (Series A & B) or as fully custom engineered solutions upon request.