Stainless Steel Flange Manufacturer
- Comprehensive Product Range
- Guaranteed Quality
- Large Stock Availability
Stainless Steel Flange for Sale
SSM supplies high-quality stainless steel flanges compliant with ASTM A182 or equivalent standards, offering both standard specifications and fully customized solutions tailored to your drawings to meet all your procurement requirements.
- Types : WN / LWN / SO / Blind / Lap Joint / SW / Threaded / Customized
- Class : 150#-2500#
- Size :1/2″-144″
- Producing Standard : ASME B16.5 / ASME B16.47 Series A & B / EN1092-1 / AWWA/ DIN / JIS/ GB ….
- Materials : 304,310, 316, 317, 321,
Stainless Steel Flanges Suppliers
SSM is a professional stainless steel flange manufacturer with years of experience in producing high-quality flanges under strict quality control, from raw material selection to forging, machining, and final inspection. We offer a complete range of standard flanges (including weld neck, slip-on, blind, lap-joint, threaded, and socket weld types) as well as custom-designed flanges.
Our products are available in various stainless steel grades such as 304/304L, 310, 316/316L/316Ti, 321/347, 904L, and duplex stainless steel, ensuring reliable solutions for diverse industrial applications. With our commitment to quality and precision, SSM is your trusted partner for all stainless steel flange requirements.
Stainless Steel Flange Types We Supply
Stainless Steel Flange Materals
SSM supplies high-quality stainless steel flanges in various grades including austenitic (304/304L, 316/316L, 321, 347), duplex (2205, 2507), high-temperature resistant (310/310S, 904L), and specialty alloys (Alloy 20), fully compliant with ASTM A182 and EN 10088-3 standards. We offer both standard and custom-designed flanges with complete material certification (MTC 3.1/3.2) to meet diverse industrial requirements.
304 Stainless Steel Flanges
- Grade: ASTM A182 F304 / EN 1.4301
- Composition: 18% Cr, 8% Ni (balanced Fe)
- Features:
✓ Excellent corrosion resistance (suitable for food/chemical environments)
✓ Good formability & weldability
✓ Cost-effective general-purpose stainless steel
316 Stainless Steel Flanges
- Grade: ASTM A182 F316 / EN 1.4401
- Composition: 16% Cr, 10% Ni, 2% Mo (key difference vs 304)
- Features:
✓ Superior chloride resistance (ideal for marine/coastal use)
✓ Enhanced acid/chemical resistance vs 304
✓ Excellent weldability & formability
310 Stainless Steel Flanges
- Grade: ASTM A182 F310 / EN 1.4841
- Composition: 25% Cr, 20% Ni (high alloy)
- Features:
✓ Extreme heat resistance (up to 1150°C continuous service)
✓ Excellent oxidation/carburization resistance
✓ Good mechanical strength at high temperatures
347 Stainless Steel Flanges
- Grade: ASTM A182 F347 / EN 1.4550
- Composition: 18% Cr, 11% Ni, Nb stabilizer (key differentiator)
- Features:
✓ Resists intergranular corrosion (superior to 304/316, ideal for welded applications)
✓ High-temperature oxidation resistance (continuous service up to 800°C)
✓ Excellent creep rupture strength
Duplex Stainless Steel Flanges
- Common Grades:
• 2205 (S31803/S32205) – Most widely used
• 2507 (S32750) – Super duplex for extreme conditions
• Zeron 100 – Hyper duplex with PREN >40 - Key Features:
✔ 2-Phase Structure (50% Austenite + 50% Ferrite)
✔ Superior Strength (2X Yield Strength vs 304/316)
✔ Excellent Corrosion Resistance (Especially for Chloride/Sulfide Environments)
Stainless Steel Flange By Standards
We can provide standard flanges according to your regional and industry-specific requirements, including flanges compliant with AWWA C228, ASME B16.5, ASME B16.47, EN 1092-1, ISO 7005, as well as DIN, JIS, and API standards, along with relevant inventory availability.
AWWA C228 Stainless Steel Flanges
- Scope: Stainless steel flanges for water/wastewater systems
- Size Range: 3″ to 144″ (DN80 to DN3600)
- Pressure Classes: 150 psi (standard), 300 psi available
- Key Feature: Focuses on potable water corrosion resistance
AWWA C228 Stainless Steel Flanges
- Scope: Stainless steel flanges for water/wastewater systems
- Size Range: 3″ to 144″ (DN80 to DN3600)
- Pressure Classes: 150 psi (standard), 300 psi available
- Key Feature: Focuses on potable water corrosion resistance
ASME B16.5 Stainless Steel Flanges (Most Common Industrial Standard)
- Size Range: 1/2″ to 24″ (DN15 to DN600)
- Pressure Classes: 150# to 2500#
- Face Types: RF, FF, RTJ, LAP
ASME B16.47 Stainless Steel Flanges (Large Diameter Flanges)
- Series A (MSS SP-44): 26″ to 60″
- Series B (API 605): 26″ to 60″
- Pressure Classes: 75# to 900#
- Special Requirement: Heat treatment verification
EN 1092-1 (European Standard)
- PN Ratings: PN6 to PN100
- Types: Type 01-11 (WN, SO, BL, etc.)
- Material Groups: 1.4301, 1.4401, 1.4462, etc.
- Unique Feature: Includes “loose flanges” design
ASME B16.5 Stainless Steel Dimensions
The stainless steel flanges we supply include, but are not limited to, 150# and 300#.
ASME B16.5 400#, 600#, 900#, 1500#, and 2500# stainless steel flange dimensions – to learn more about flange sizes, please start here.
Advantages of Stainless Steel Flanges
Corrosion Resistance and High Strength
Stainless steel flanges offer excellent corrosion resistance and high strength, making them ideal for resisting various chemical media and operating in high-temperature and high-pressure environments. This ensures the stability and safety of pipe connections.
Long Service Life
Due to their outstanding corrosion resistance and strength, stainless steel flanges typically have a longer service life, reducing the need for frequent replacements and lowering maintenance costs.
Hygiene and Aesthetic Appearance
Stainless steel flanges have good hygienic properties, ensuring that they do not contaminate the media, making them suitable for the food, beverage, and pharmaceutical industries. Additionally, their smooth surface and attractive appearance maintain a good look even in exposed applications.
Weldability and Versatility
Stainless steel flanges have excellent weldability, allowing for high-quality welding with other pipes or equipment. They also come in a wide range of specifications, making them suitable for various industrial needs.
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing Stainless Steel Flanges. Whether it’s quality or price, we will meet your needs.
Application of Stainless Steel Flange
Stainless steel flanges are widely used in various industrial fields, primarily for connecting pipes, valves, pumps, and other equipment, ensuring the system’s sealing and stability. Specific applications include:
Chemical Industry: Excellent corrosion resistance, suitable for chemical transport systems.
Oil and Gas: Used for pipe system connections, capable of withstanding high-pressure and temperature environments.
Food Processing: Meets sanitary requirements and is widely used in the food and beverage industry.
Pharmaceutical Industry: Used in pipeline connections during pharmaceutical production to ensure no contamination.
Marine and Shipbuilding: Due to its seawater corrosion resistance, it is commonly used in ships and offshore platforms.
Water Treatment: Used in water supply systems to ensure sealing and corrosion resistance.
The corrosion resistance and strength of stainless steel flanges are crucial in these fields.
List of stainless steel flange products provided by SSM. Here you can find the products you need:
| stainless steel blind flange | stainless steel 316 flanges | 3/4 stainless steel flange |
| stainless steel weld neck flange | stainless steel 316l flanges | 1 inch stainless steel flange |
| stainless steel threaded flange | stainless steel 304 flange | 1 1/2 stainless steel flange |
| stainless steel slip on flange | stainless steel 304l flanges | 2 inch stainless steel flange |
| stainless steel lap joint flange | 254 smo flanges | 3 inch stainless steel flange |
| stainless steel plate flanges | duplex 2205 flanges | 4 inch stainless steel flange |
| stainless steel socket weld flange | duplex stainless steel flanges | 6 stainless steel flange |
| stainless steel swivel flange | stainless steel 904l flanges | pn16 stainless steel flanges |
| stainless steel reducing flange | ss 310 flanges | AL6XN flanges |
Additional information on Stainless Steel Flange
Chemical Composition Stainless Steel Flange
Below is the chemical composition of the stainless steel flanges presented in a table:
| Grade | C (Max) | Mn (Max) | P (Max) | S (Max) | Si (Max) | Cr | Ni | Mo | N | Cu | Others |
| F304/F304L | 0.08/0.03 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 | – | – | – | – |
| F316/F316L | 0.08/0.03 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | – | – | – |
| F51 (UNS S31803) | 0.03 | 2 | 0.03 | 0.02 | 1 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 | – | 0.14-0.20 W, 0.50 V max |
| F53 (UNS S32750) | 0.03 | 1.2 | 0.035 | 0.015 | 0.8 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | – | 0.14-0.20 W, 0.50 V max |
| Alloy 20 (UNS N08020) | 0.07 | 2 | 0.045 | 0.035 | 1 | 19.0-21.0 | 32.0-38.0 | 2.0-3.0 | – | 3.0-4.0 | 0.02-0.03 Nb, 0.35 Ti max |
More Resources:
FAQ
Standard sizes range from ½ inch to 48 inches, depending on the flange type and standard (ASME, DIN, JIS, etc.).
Yes, but galvanic corrosion may occur at the joint. It’s recommended to use insulating gaskets or sleeves to separate the materials.
Regular inspection and cleaning are recommended to maintain the performance and appearance of stainless steel flanges. Use mild cleaning agents and avoid abrasive materials that can scratch the surface. For flanges in corrosive environments, consider applying a protective coating or using passivation to enhance corrosion resistance.
HS Code: 73072100 – Stainless steel flanges for pipes/tubes.
Yes, but not recommended due to galvanic corrosion risk. Prefer stainless steel or insulated bolts.
Prices vary by material and size.
- 304 SS Flange 2″ Class 150: $5–$15
- 316 SS Flange 2″ Class 150: $10–$25
Replace if:
- Corroded or cracked
- Deformed sealing surfaces
- Gasket sealing repeatedly fails
- Worn bolt holes or threads
Related Products to Stainless Steel Flanges:
- stainless steel flange bolts
- stainless steel flanges and fittings
- stainless steel flange nuts
- stainless steel flange screws
- stainless steel pipe
- stainless steel flanged ball valves
- stainless steel hex head flange bolts
- stainless steel flanged elbow
- stainless steel flanged gate valve
- stainless steel flange gasket
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