Carbon Steel Flanges
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As one of the leading Carbon Steel Flanges suppliers, Neeka Tubes provides carbon steel flanges for piping, oil and gas, and process industries, based in India. These connect pipes, valves and equipment, sealing the joint so it doesn’t leak under pressure. We stock them to ASTM A105, ASME SA105 and A105N specifications, following ANSI/ASME B16.5, B16.47 Series A and B, and EN-1092 standards. Sizes run 1/2 inch to 48 inches, pressure classes 150# to 2500#, and PN6 to PN64 metric. Flat Face, Raised Face and Ring Type Joint are all available, across ANSI, ASME and BS classifications.
Features of Carbon Steel Flanges
- High Strength & Durability – Provides superior mechanical properties for heavy-duty usage.
- Rust & Corrosion Resistant – Offers protection against corrosion and adverse conditions.
- Easy Installation & Maintenance – Designed for secure fitting and minimal upkeep.
- Temperature & Pressure Tolerance – Performs well under high pressure and extreme temperatures.
- Variety of Designs & Standards – Comes in various sizes, pressure ratings and configurations.
Carbon Steel Flanges are used in industries requiring high-quality and reliable pipe connections. These include oil & gas, chemical processing, petrochemical, power plants, water treatment, construction and shipbuilding. They provide a secure and leak-proof connection in pipelines transporting steam, oil, water, gas and other fluids under high pressure and temperature.
Selecting the Right Carbon Steel Flange for Different Operating Conditions
Flange Facing Options and Their Industrial Benefits
Inspection, Traceability & Export Packaging
Why Choose Neeka Tubes?
Most Common Types of Carbon Steel Flanges
CS Blind Flange
CS Socket Weld Flange
CS Slip on Flange
CS Weld Neck Flange
CS Threaded Flange
CS Spectacle Blind Flange
CS Ring Type Joint Flange
CS Lap Joint Flanges
CS Forged Flanges
CS Plate Flanges
CS Orifice Flanges
CS Long Weld Neck Flange
Carbon Steel Flanges Specifications
| Specifications | ASTM A105 / ASME SA105, A105N |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Size | 1/2″ to 48″ |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Flanges Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
Carbon Steel Flanges Chemical Composition
| Elements | Carbon [C] | Manganese [Mn] | Phosphorus [P] | Sulfur [S] | Silicon [Si] | Copper [Cu] | Nickel [Ni] | Chromium [Cr] | Molybdenum [Mo] | Vanadium [V] |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition, % | ≤0.35 | 0.60-1.05 | ≤0.35 | ≤0.40 | 0.10-0.35 | ≤0.40 | ≤0.40 | ≤0.30 | ≤0.12 | ≤0.08 |
Mechanical Properties of Carbon Steel Flanges
| Tensile Strength min. | Yield Strength min. | Elongation min. | Reduction of Area, min. | Hardness | ||
|---|---|---|---|---|---|---|
| MPa | ksi | MPa | ksi | % | % | HBW |
| 485 | 70 | 250 | 36 | 22 | 30 | 137-187 |
Equivalent Grades For Carbon Steel Flanges
| Standard | ASTM | ASME | DIN | EN | BS | JIS |
|---|---|---|---|---|---|---|
| Carbon Steel | A105 | SA105 | 1.0460 | P250GH | 1503-245 | SF440 |
| Low-Temperature Carbon Steel | A350 LF2 | SA350 LF2 | 1.0508 | P280GH | 1503-241 | SF490 |
| High-Yield Carbon Steel | A694 F52 | SA694 F52 | 1.8983 | S355NL | EN10025-3 | SM490 |
Carbon Steel Flanges Dimensions Chart
| Pipe Size | 150 # | 300 # | 600 # | 900 # | 1500 # | 2500 # | ||||||||||||
| WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | WN | SO | BLD | |
| 1/2″ | 2 | 1 | 1 | 2 | 1 | 1 | 2 | 2 | 2 | SEE 1500 # WEIGHTS | 5 | 4 | 4 | 7 | 7 | 7 | ||
| 3/4″ | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 3 | 3 | SEE 1500 # WEIGHTS | 6 | 5 | 6 | 8 | 8 | 8 | ||
| 1″ | 3 | 2 | 2 | 4 | 3 | 3 | 4 | 4 | 4 | SEE 1500 # WEIGHTS | 9 | 8 | 8 | 12 | 11 | 11 | ||
| 1 1/2″ | 4 | 3 | 3 | 7 | 6 | 6 | 8 | 7 | 8 | SEE 1500 # WEIGHTS | 13 | 12 | 13 | 25 | 22 | 23 | ||
| 2″ | 6 | 5 | 5 | 9 | 7 | 8 | 12 | 9 | 10 | SEE 1500 # WEIGHTS | 25 | 25 | 25 | 42 | 37 | 39 | ||
| 2 1/2″ | 8 | 7 | 7 | 12 | 10 | 12 | 18 | 13 | 15 | SEE 1500 # WEIGHTS | 36 | 36 | 35 | 52 | 55 | 56 | ||
| 3″ | 10 | 8 | 9 | 15 | 13 | 16 | 23 | 16 | 20 | 31 | 26 | 29 | 48 | 48 | 48 | 94 | 83 | 86 |
| 4″ | 15 | 13 | 17 | 25 | 22 | 27 | 42 | 37 | 41 | 53 | 53 | 54 | 73 | 73 | 73 | 145 | 125 | 130 |
| 5″ | 19 | 15 | 20 | 32 | 28 | 35 | 68 | 63 | 68 | 86 | 83 | 87 | 130 | 130 | 140 | 245 | 210 | 225 |
| 6″ | 24 | 19 | 26 | 42 | 39 | 50 | 81 | 80 | 86 | 110 | 110 | 115 | 165 | 165 | 160 | 380 | 325 | 345 |
| 8″ | 39 | 30 | 45 | 67 | 58 | 81 | 120 | 115 | 140 | 175 | 170 | 200 | 275 | 260 | 300 | 580 | 485 | 530 |
| 10″ | 52 | 43 | 70 | 91 | 81 | 124 | 190 | 170 | 230 | 260 | 245 | 290 | 455 | 435 | 510 | 1075 | 930 | 1025 |
| 12″ | 80 | 64 | 110 | 140 | 115 | 185 | 225 | 200 | 295 | 325 | 325 | 415 | 690 | 580 | 690 | 1525 | 1100 | 1300 |
| 14″ | 110 | 90 | 140 | 180 | 165 | 250 | 280 | 230 | 355 | 400 | 400 | 520 | 940 | NA | 975 | NA | NA | NA |
| 16″ | 140 | 98 | 180 | 250 | 190 | 295 | 390 | 330 | 495 | 495 | 425 | 600 | 1250 | NA | 1300 | NA | NA | NA |
| 18″ | 150 | 130 | 220 | 320 | 250 | 395 | 475 | 400 | 630 | 680 | 600 | 850 | 1625 | NA | 1750 | NA | NA | NA |
| 20″ | 180 | 165 | 285 | 400 | 315 | 505 | 590 | 510 | 810 | 830 | 730 | 1075 | 2050 | NA | 2225 | NA | NA | NA |
| 22″ | 225 | 185 | 355 | 465 | 370 | 640 | 720 | 590 | 1000 | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 24″ | 260 | 220 | 430 | 580 | 475 | 790 | 830 | 730 | 1250 | 1500 | 1400 | 2025 | 3325 | NA | 3625 | NA | NA | NA |
Carbon Steel Flanges Weight Chart
| Standard | Class | Diameter | Bolt Circle Diameter | Number of Bolts | Bolt Size | Diameter of Bolt Hole |
|---|---|---|---|---|---|---|
| AS4087 | PN14 | 95 | 67 | 4 | M12 | 14 |
| AS 2129 Flanges | Table C | 95 | 67 | 4 | 13 | 14 |
| Table D | 95 | 67 | 4 | 13 | 14 | |
| Table E | 95 | 67 | 4 | 13 | 14 | |
| Table F | 95 | 67 | 4 | 13 | 14 | |
| Table H | 114 | 83 | 4 | 16 | 17 | |
| Table J | 114 | 83 | 4 | 16 | 17 | |
| ANSI B16.5 | ANSI 150 | 89 | 60 | 4 | 13 | 16 |
| ANSI 300 | 95 | 67 | 4 | 13 | 16 | |
| ANSI 600 | 95 | 67 | 4 | 13 | 16 | |
| ANSI 900 | 121 | 83 | 4 | 19 | 22 | |
| ANSI 1500 | 121 | 83 | 4 | 19 | 22 | |
| ISO 7005 (DIN) Flanges | PN6 | 80 | 55 | 4 | M10 | 11 |
| PN10 | 95 | 65 | 4 | M12 | 14 | |
| PN16 | 95 | 65 | 4 | M12 | 14 | |
| PN20 | 90 | 60.5 | 4 | M14 | 16 | |
| PN25 | 95 | 65 | 4 | M12 | 14 | |
| PN40 | 95 | 65 | 4 | M12 | 14 |
Carbon Steel Flanges Packing & Marking
Packaging & Marking Details
We make sure that Carbon Steel Flanges are packaged and delivered safely. They are packed into wooden crates, on pallets or wrapped in bubble wrap for safety in transit. Each flange is marked with its size, grade, standard, pressure rating and heat number to ensure identification. Our fast and secure global shipping guarantees timely delivery to clients.
Quality Tests
Strict quality tests are done to ensure high standards for Carbon Steel Flanges, which include chemical composition analysis, mechanical testing, hardness testing, hydrostatic tests, and PMI testing. We provide superior quality and reliability with Mill Test Certificates, EN 10204/3.1B certification and third party inspection reports.
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Industrial Application of Carbon Steel Flanges
Frequently Asked Questions
What types of carbon steel flanges do you manufacture and supply?
We manufacture and supply Weld Neck, Slip-On, Blind, Socket Weld and Lap Joint, in Flat Face, Raised Face and Ring Type Joint.
Which carbon steel flange grade is suitable for high-pressure piping systems?
The carbon steel flange grade A105N is suitable for high-pressure piping systems. It covers pressure classes up to 2500# for high-pressure oil, gas and steam lines.
