Stainless Steel 304/304L Flanges Manufacturer
Midland Alloys Inc. is one of the leading and trusted suppliers of Stainless Steel 304/304L flanges in India. These flanges are made up of SS 304, which is known for its strength and superior resistance to corrosion, and SS 304L, which has less carbon for improved weldability. With strong heat resistance and easy formability, they’re ideal for piping systems that demand durability and clean performance, including hygienic applications. Our and ASME SA182 Grade 304 stainless steel pipe flanges are seamless and welded flanges in various kinds including weld neck, slip-on, blind, threaded, socket weld and lap joint, available in various sizes, thicknesses, and pressure ratings. Widely used across industries, AISI 304/304L stainless steel flanges are valued for their quality and long life. Known for durability and a clean finish, products like the ASTM A182 stainless steel 304 flanges are widely used in industries worldwide. We ensure high quality, competitive pricing, and on-time delivery—reach out today for your requirements.
Stainless Steel 304/304L Flanges Overview
Advantages of Using SS 304/304L Flanges
Stainless Steel 304/304L flanges offer a solid mix of strength, flexibility and corrosion resistance. Here are the key benefits explained simply:
- Superior Corrosion Resistance: SS Flanges can withstand moisture, chemicals, and rust in harsh environments.
- Custom and Standard Sizes Available: Comes in ready-stock dimensions or made to match your exact need.
- Works in High-Temperature and Moderate-Pressure Systems: AISI 304 flanges perform well under heat and pressure without losing strength.
- Easy to Weld, Form, and Fabricate: Installs quickly with smooth cutting, bending, and welding.
- Strong and Durable: A182 F304L WNRF Flange offers long service life with minimal wear or failure.
- Secure Pipe Connections: Ensures leak-proof joints that are easy to maintain or replace.
- Cost-Effective and Reliable: Delivers strong value with steady performance and fair pricing.
- Global Shipping and Support: Ships worldwide with proper documentation and careful packaging.
Contact us for premium flanges, dependable shipping, affordable prices and complete quality control.
Stainless Steel 304/304L Flanges Specification
1/2" (15 NB) to 48" (1200NB)
ASTM A182 / ASME SA182
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Threaded / Screwed / Forged / Plate
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Forging, Rolling, Casting
FNPT, NPT, BSPT, MNPT, BSPP
Stainless Steel 304/304L Flanges Types
Manufacturing Types
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SORF (Slip-On Raised Face)Slides over the pipe and gets welded for easy installation in low-pressure systems.
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BLRF (Blind Raised Face)Closes off pipe ends; used for testing or sealing flow in a system.
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SWRF (Socket Weld Raised Face)Pipe fits into a recessed area and is welded around the edge. Ideal for small-bore, high-pressure lines.
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WNRF (Weld Neck Raised Face)Has a long, tapered hub and welds to the pipe for strong, leak-proof joints under high pressure.
Face Forms
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Raised Face (RF)The most common type has a raised surface that improves gasket sealing in medium to high pressure.
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Ring Type Joint (RTJ)Uses a metal ring for sealing and works well in high-pressure, high-temperature services.
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Flat Face (FF)Flat surface flange used with cast iron or low-pressure piping where full face gasket is needed.
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Lap-Joint Face (LJF)Used with stub ends and are easy to align and install. Good for systems that need frequent dismantling.
Contact us today to discuss how Stainless Steel 304/304L Flanges can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
These equivalent tables of Stainless Steel 304/304L across various international standards, including UNS, WNR, AFNOR, EN, JIS, BS, and GOST. It helps in identifying matching specifications for global sourcing and compliance.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 304 | 1.4301 | S30400 | SUS 304 | 304S31 | 08Х18Н10 | Z7CN18‐09 | X5CrNi18-10 |
This table shows the standard chemical composition of Stainless Steel 304/304L flanges as per ASTM A182, including key elements like chromium, nickel, and carbon that define corrosion resistance and weldability.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 304 | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 11 | – |
The AISI 304/304L stainless steel flanges table’s mechanical properties include elongation, yield strength, and tensile strength. These characteristics are crucial for understanding load performance and durability.
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
The approximate weights of Stainless Steel 304/304L flanges across different sizes and pressure classes make it easier to plan logistics, handling, and installation.
| Pipe Normal Diameter (inch) | Outer diameter Flange | Thicjness Of Flange Minimum | Diameter of Hub | Diameter of Raised Face | Length Hub.Y | Thread Length | Diameter of Bolt Circle | Diameter of Bolt Holes | Number of Bolts | Diameter of Bolts (inch) | KG | LB | |
| 1/2″ | 15 | 89.00 | 11.20 | 30.20 | 35.10 | 15.70 | 15.70 | 60.50 | 15.80 | 4 | 1/2″ | 0.4 | 0.9 |
| 3/4″ | 20 | 98.50 | 12.70 | 38.10 | 42.90 | 15.70 | 15.70 | 69.90 | 15.80 | 4 | 1/2″ | 0.7 | 1.5 |
| 1″ | 25 | 108.00 | 14.20 | 49.30 | 50.80 | 17.50 | 17.50 | 79.30 | 15.80 | 4 | 1/2″ | 0.8 | 1.8 |
| 1-1/4″ | 32 | 117.50 | 15.70 | 58.70 | 63.50 | 20.60 | 20.60 | 88.90 | 15.80 | 4 | 1/2″ | 1.2 | 2.6 |
| 1-1/2″ | 40 | 127.00 | 17.50 | 65.00 | 73.20 | 22.40 | 22.40 | 98.60 | 15.80 | 4 | 1/2″ | 1.5 | 3.3 |
| 2″ | 50 | 152.50 | 19.10 | 77.70 | 91.90 | 25.40 | 25.40 | 120.70 | 19.10 | 4 | 5/8″ | 2.3 | 5.1 |
| 2-1/2″ | 65 | 178.00 | 22.40 | 90.40 | 104.60 | 28.40 | 28.40 | 139.70 | 19.10 | 4 | 5/8″ | 3.7 | 8.1 |
| 3″ | 80 | 190.50 | 23.90 | 108.00 | 127.00 | 30.20 | 30.20 | 152.40 | 19.10 | 4 | 5/8″ | 4.1 | 9 |
| 3-1/2″ | 90 | 216.00 | 23.90 | 122.20 | 139.70 | 31.80 | 31.80 | 177.80 | 19.10 | 8 | 5/8″ | 5.1 | 11.2 |
| 4″ | 100 | 228.50 | 23.90 | 134.90 | 157.20 | 33.30 | 33.30 | 190.50 | 19.10 | 8 | 5/8″ | 5.9 | 13 |
| 5″ | 125 | 254.00 | 23.90 | 163.60 | 185.70 | 36.60 | 36.60 | 215.90 | 22.40 | 8 | 3/4″ | 7 | 15.4 |
| 6″ | 150 | 279.50 | 25.40 | 192.00 | 215.90 | 39.60 | 39.60 | 241.30 | 22.40 | 8 | 3/4″ | 8.4 | 18.5 |
| 8″ | 200 | 343.00 | 28.40 | 246.10 | 269.70 | 44.50 | 44.50 | 298.50 | 22.40 | 8 | 3/4″ | 13 | 28.6 |
| 10″ | 250 | 406.50 | 30.20 | 304.80 | 323.90 | 49.30 | 49.30 | 362.00 | 25.40 | 12 | 7/8″ | 18 | 39.5 |
| 12″ | 300 | 482.50 | 31.80 | 365.30 | 381.00 | 55.60 | 55.60 | 431.80 | 25.40 | 12 | 7/8″ | 29 | 64 |
| 14″ | 350 | 533.50 | 35.10 | 400.10 | 412.80 | 57.20 | 57.20 | 476.30 | 28.50 | 12 | 1″ | 39 | 86 |
| 16″ | 400 | 597.00 | 36.60 | 457.20 | 469.90 | 63.50 | 63.50 | 539.80 | 28.50 | 16 | 1″ | 47 | 103 |
| 18″ | 450 | 635.00 | 39.60 | 505.00 | 533.40 | 68.30 | 68.30 | 577.90 | 31.80 | 16 | 1 1/8″ | 57 | 126 |
| 20″ | 500 | 698.50 | 42.90 | 558.80 | 584.20 | 73.20 | 73.20 | 635.00 | 31.80 | 20 | 1 1/8″ | 76 | 167 |
| 24″ | 600 | 813.00 | 47.80 | 663.40 | 692.20 | 82.60 | 82.60 | 749.30 | 35.10 | 20 | 1 1/4″ | 97 | 214 |
This section provides the Harmonized System of Nomenclature (HSN) code for ASTM A182 F304 stainless steel flanges, useful for tax classification, shipping, and export documentation.
| HS Code | Description |
| 73072900 | Flange SS 304 Pipe |
Pressure ratings for 304 stainless steel flanges under different class ratings help with selecting the appropriate flange for a variety of pressures.
| ANSI/ASME B16.34 | Presure Rating Chart | ||||||
| Temperature °F | 300# | 600# | 1500# | 150# | 400# | 900# | 2500# |
|---|---|---|---|---|---|---|---|
| 800 | 405 | 805 | 2015 | 80 | 540 | 1210 | 3360 |
| 900 | 390 | 780 | 1945 | 50 | 520 | 1165 | 3240 |
| 300 | 540 | 1080 | 2700 | 205 | 720 | 1620 | 4500 |
| 500 | 465 | 930 | 2330 | 170 | 620 | 1395 | 3880 |
| 650 | 430 | 860 | 2150 | 125 | 575 | 1290 | 3580 |
| 750 | 415 | 830 | 2075 | 95 | 555 | 1245 | 3460 |
| 1000 | 320 | 640 | 1605 | 20 | 430 | 965 | 2675 |
| 1100 | 255 | 515 | 1285 | 20 | 345 | 770 | 2145 |
| 1200 | 155 | 310 | 770 | 20 | 205 | 465 | 1285 |
| 1450 | 35 | 70 | 170 | 15 | 45 | 105 | 285 |
| 1300 | 85 | 170 | 430 | 20 | 115 | 255 | 715 |
| 1400 | 50 | 95 | 240 | 20 | 65 | 145 | 400 |
| -20 to 100 | 720 | 1440 | 3600 | 275 | 960 | 2160 | 6000 |
| 850 | 395 | 790 | 1980 | 65 | 530 | 1190 | 3300 |
| 200 | 600 | 1200 | 3000 | 230 | 800 | 1800 | 5000 |
| 400 | 495 | 995 | 2485 | 190 | 660 | 1490 | 4140 |
| 600 | 435 | 875 | 2185 | 140 | 580 | 1310 | 3640 |
| 700 | 425 | 850 | 2125 | 110 | 565 | 1275 | 3540 |
| 950 | 380 | 765 | 1910 | 35 | 510 | 1145 | 3180 |
| 1050 | 310 | 615 | 1545 | 20 | 410 | 925 | 2570 |
| 1150 | 200 | 400 | 995 | 20 | 265 | 595 | 1655 |
| 1250 | 115 | 225 | 565 | 20 | 150 | 340 | 945 |
| 1500 | 25 | 55 | 135 | 10 | 35 | 80 | 230 |
| 1350 | 60 | 125 | 310 | 20 | 80 | 185 | 515 |
These standard dimensions of Stainless Steel 304L flanges, such as outer diameter, thickness, bolt circle, and hole size, are based on ANSI/ASME standards.
| NPS (Nominal Pipe Size) | Outside Diameter (OD) mm | Bolt Circle Diameter (BCD) mm | Number of Bolts | Bolt Size | Flange Thickness (mm) | Raised Face Diameter (mm) |
|---|---|---|---|---|---|---|
| 1/2″ | 90 | 65 | 4 | 1/2″ | 14 | 65 |
| 3/4″ | 105 | 80 | 4 | 1/2″ | 14 | 80 |
| 1″ | 120 | 95 | 4 | 5/8″ | 16 | 95 |
| 1 1/2″ | 165 | 125 | 4 | 5/8″ | 18 | 125 |
| 2″ | 180 | 150 | 4 | 3/4″ | 19 | 150 |
| 3″ | 230 | 190 | 6 | 3/4″ | 22 | 190 |
| 4″ | 285 | 250 | 8 | 7/8″ | 24 | 250 |
| 6″ | 340 | 310 | 8 | 1″ | 27 | 310 |
| 8″ | 405 | 370 | 8 | 1 1/8″ | 30 | 370 |
| 10″ | 480 | 445 | 12 | 1 1/8″ | 33 | 445 |
| 12″ | 560 | 520 | 12 | 1 1/4″ | 36 | 520 |
| 14″ | 635 | 585 | 12 | 1 3/8″ | 38 | 585 |
| 16″ | 710 | 650 | 16 | 1 3/8″ | 41 | 650 |
| 18″ | 840 | 760 | 16 | 1 1/2″ | 43 | 760 |
| 20″ | 915 | 825 | 20 | 1 1/2″ | 46 | 825 |
| 24″ | 1065 | 940 | 20 | 1 3/4″ | 50 | 940 |
Stainless Steel Flanges Grades We Offer
Manufacturing Process of Stainless Steel 304/304L Flanges
Plate
Shear
Press
Inspection
Lathe
Drilling
Cleaning
Flange
Inspection
Analytic
Marking
Packing & Shipping
Stainless Steel 304/304L Flanges Applications
Our Packing Standards
We pack Stainless Steel 304/304L flanges with care using export-grade materials to prevent damage during handling and transit. Our standard methods include HDPE wrapping, shrink wrap, protective caps, and strong wooden crates. For special needs, we also offer customized packing options. Every package comes with clear labeling that shows the grade, size, standards, and heat numbers. We handle both local deliveries by road and rail and global shipping by air or sea. We handle everything with ease, whether it’s a project-based supply, for an extreme environment application or a large bulk order. In-stock items are shipped the same day, while custom orders follow scheduled lead times. Each shipment includes an invoice, packing list, test certificates, and export documents if required. We also follow customer-specific or international packaging standards, including GCC and European norms.
Why Choose Midland Alloys Inc.?
FAQs – SS 304/304L Flanges
304L has low carbon content for better weldability; 304H has high carbon for better strength at high temperatures.
No, 304L is not ideal for high temperatures. 304H is better suited due to its higher carbon content.
No, generally 304L and 304 have similar prices, but slight variations may occur based on demand or supplier.
Make use of a Positive Material Identification (PMI) instrument or a chemical test kit. 304 lacks molybdenum, whereas 316 does.
