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Carbon steel flanges
Material: ASTM A105, A350 LF2, A694 F42, F52, F60, F65, F70
Thickness: Schedule 10(S) to SCH 160
Standard: ASME, ANSI, DIN, JIS, EN, GOST etc.
Class Range: Class 150 to 2500 (# or LB), PN 2.5 to PN 250
Flange Face Type: RF, FF, MFM, TG, RTJ
Connection: Butt Weld, Slip On, Socket Weld, Threaded or Lap Joint
Manufacturing Process: Forging
Carbon steel flanges provide high mechanical strength, reliable sealing performance, and excellent pressure resistance. They are suitable for general industrial, high-pressure, and high-temperature piping systems.
They comply with standards such as ANSI/ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, and GOST. Common materials include ASTM A105, A350 LF2, and A694 grades.
Widely used in oil and gas, petrochemical, power generation, water treatment, construction, and industrial piping systems.
Carbon steel flanges and end flange connectors are essentially made of carbon steel. Common standards include ASTM A694, ASTM A350, ASTM A105N (SA105N), MSS SP-44, DIN 2533. The pressure ratings available are from Class 150 to Class 2500. Flanges made from carbon steel contain between 0.05% and 2.1% carbon by weight in their chemical composition. The carbon content of A105 can vary, with the maximum permissible percentage composition being 0.35.
As the carbon content increases, the steel is hardened and increases in strength through heat treatment processes. Many common treatment techniques in the industry are quenching, tempering, and normalizing. As carbon steel is treated, it becomes less ductile and less brittle. This makes forming and welding slightly more difficult, but it is generally considered a worthwhile trade-off in field service to create the necessary weld seal.
Our Supply Range
Dimensions: 1/2”, 2”, 3”, 4”, 6”, 8”, 10”, Customized up to 60”
Material: Carbon Steel
Thickness: SCH.10, 20, 30, 40, 80, 120, 160, STD, XS, XXS.
Standard: ASME, ANSI, DIN, JIS, EN , etc
Class Range: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 & Class 2500
Pressure : DIN PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160
Flange Face Type: RF, FF, MFM, TG, RJ
Manufacturing Process: Forging
We provide Carbon steel flanges of various standards, such as ASME/ANSI B16.47, B16.5, EN standards, etc. We also provide customized Carbon steel flanges products.
Our stock range of Carbon steel flanges
| NPS | O | T1 | R | X | No.2/Dia.of Holes |
Bolt Circle Dia |
L21 | H | B23 | L | B | r | L34 | B3 | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.50 | 0.44 | 1.38 | 1.19 | 4-0.62 | 2.38 | 1.88 | 0.84 | 0.62 | 0.62 | 0.88 | 0.12 | 0.62 | 0.90 | 0.38 |
| 3/4 | 3.88 | 0.50 | 1.69 | 1.50 | 4-0.62 | 2.75 | 2.06 | 1.05 | 0.82 | 0.62 | 1.09 | 0.12 | 0.62 | 1.11 | 0.44 |
| 1 | 4.25 | 0.56 | 2.00 | 1.94 | 4-0.62 | 3.12 | 2.19 | 1.32 | 1.05 | 0.69 | 1.36 | 012 | 0.69 | 1.38 | 0.50 |
| 1-1/4 | 4.62 | 0.62 | 2.50 | 2.31 | 4-0.62 | 3.50 | 2.25 | 1.66 | 1.38 | 0.81 | 1.70 | 0.19 | 0.81 | 1.72 | 0.58 |
| 2-1/2 | 7.00 | 0.88 | 4.12 | 3.56 | 4-0.75 | 6.50 | 2.75 | 2.88 | 2.47 | 1.12 | 2.94 | 0.31 | 1.12 | 2.97 | 0.75 |
| 3 | 7.50 | 0.94 | 5.00 | 4.25 | 4-0.75 | 6.00 | 2.75 | 3.50 | 3.07 | 1.19 | 3.57 | 0.38 | 1.19 | 3.60 | 0.81 |
| 3-1/2 | 8.50 | 0.94 | 5.50 | 4.81 | 8-0.75 | 7.00 | 2.81 | 4.00 | 3.55 | 1.25 | 4.07 | 0.38 | 1.25 | 4.10 | 0.88 |
| 4 | 9.00 | 0.94 | 6.19 | 5.31 | 8-0.75 | 7.50 | 3.00 | 4.50 | 4.03 | 1.31 | 4.57 | 0.44 | 1.31 | 4.80 | 0.94 |
| 5 | 10.00 | 0.94 | 7.31 | 6.44 | 8-0.88 | 8.50 | 3.50 | 5.56 | 5.05 | 1.44 | 5.66 | 0.44 | 1.44 | 6.69 | 0.94 |
| 6 | 11.00 | 1.00 | 8.50 | 7.56 | 8-0.88 | 9.50 | 3.50 | 6.63 | 6.07 | 1.56 | 6.72 | 0.50 | 1.56 | 6.75 | 1.06 |
| 8 | 13.50 | 1.12 | 10.62 | 9.69 | 8-0.88 | 11.75 | 4.00 | 8.63 | 7.98 | 1.75 | 8.72 | 0.50 | 1.75 | 8.75 | 1.25 |
| 10 | 16.00 | 1.19 | 12.75 | 12.00 | 12-1.00 | 14.25 | 4.00 | 10.75 | 10.02 | 1.94 | 10.88 | 0.50 | 1.94 | 10.92 | 1.31 |
| 12 | 19.00 | 1.25 | 15.00 | 14.38 | 12-1.00 | 17.00 | 4.50 | 12.75 | 12.00 | 2.19 | 12.88 | 0.50 | 2.19 | 12.92 | 1.56 |
| 14 | 21.00 | 1.38 | 16.25 | 15.75 | 12-1.12 | 18.75 | 5.00 | 14.00 | 13.25 | 2.25 | 14.14 | 0.50 | 3.12 | 14.18 | 1.63 |
| 16 | 23.50 | 1.44 | 18.50 | 18.00 | 16-1.12 | 21.25 | 5.00 | 16.00 | 15.25 | 2.50 | 16.16 | 0.50 | 3.44 | 16.19 | 1.75 |
| 18 | 25.00 | 1.56 | 21.00 | 19.88 | 16-1.25 | 22.75 | 5.50 | 18.00 | 17.25 | 2.69 | 18.18 | 0.50 | 3.81 | 18.20 | 1.94 |
| 20 | 27.50 | 1.69 | 23.00 | 22.00 | 20-1.25 | 25.00 | 5.69 | 20.00 | 19.25 | 2.88 | 20.20 | 0.50 | 4.06 | 20.25 | 2.13 |
| 22 | 29.50 | 1.81 | 25.25 | 24.25 | 20-1.38 | 27.25 | 5.88 | 22.00 | 21.25 | 3.13 | 22.22 | 0.50 | 4.25 | 22.25 | 2.38 |
| 24 | 32.00 | 1.88 | 27.25 | 26.12 | 20-1.38 | 29.50 | 6.00 | 24.00 | 23.25 | 3.25 | 24.25 | 0.50 | 4.38 | 24.25 | 2.50 |
Carbon Steel Flanges Standards / Specifications
| Standards | Types | Pressure Class |
|---|---|---|
| ASME/ANSI B 16.5 | Threaded Flange, Ring Type Joint Flange, Blind Flange, Welding Neck Flange, Slip on Flange,High Hub Blind Flange, Socket Weld Flange, Lap Joint Flange | 150, 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.47 | Blind Flange [Series A & B], Welding Neck Flange | 75, 150, 300, 400, 600, 900 |
| ASME/ANSI B 16.36 | Slip on Flange, Welding Neck Flange, Threaded Flange | 300, 400, 600, 900, 1500, 2500 |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 | PN 6 TO PN 100 |
| BS 4504 SEC 3.1 | Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange | PN 2.5 TO PN 40 |
| BS 4504[PART 1] | Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded | PN 2.5 TO PN 400 |
| BS 1560 BOSS | Blind Flange, Screwed Boss Flange, Lapped FlangeWelding Neck Flange, Socket Welding Flange, Slip-On Flange | 150, 300, 400, 600, 900, 1500, 2500 |
carbon steel Flanges pressure rating(A105 / A350 LF2 / A350 LF3 / A350 LF6)
| Temperature (F°) | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
|---|---|---|---|---|---|---|---|
| -20 to 100 | 285 | 740 | 985 | 1480 | 2220 | 3705 | 6170 |
| 200 | 260 | 680 | 905 | 1360 | 2035 | 3395 | 5655 |
| 300 | 230 | 655 | 870 | 1310 | 1965 | 3270 | 5450 |
| 400 | 200 | 635 | 845 | 1265 | 1900 | 3170 | 5280 |
| 500 | 170 | 605 | 805 | 1205 | 1810 | 3015 | 5025 |
| 600 | 140 | 570 | 755 | 1135 | 1705 | 2840 | 4730 |
| 650 | 125 | 550 | 730 | 1100 | 1650 | 2745 | 4575 |
| 700 | 110 | 530 | 710 | 1060 | 1590 | 2655 | 4425 |
| 750 | 95 | 505 | 675 | 1015 | 1520 | 2535 | 4230 |
| 800 | 80 | 410 | 550 | 825 | 1235 | 2055 | 3430 |
| 850 | 65 | 320 | 425 | 640 | 955 | 1595 | 2655 |
| 900 | 50 | 230 | 305 | 460 | 690 | 1150 | 1915 |
| 950 | 35 | 135 | 185 | 275 | 410 | 685 | 1145 |
| 1000 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
Advantages of Carbon Steel Flanges
High Strength and Durability
Carbon steel flanges provide excellent mechanical strength and reliable performance in high-pressure industrial piping systems.
Cost-Effective Solution
Compared with stainless steel and alloy steel flanges, carbon steel flanges offer a more economical solution for general industrial applications.
Excellent Pressure Resistance
Their forged structure withstands high internal pressure and external loads, helping maintain secure and stable pipe connections.
Wide Range of Specifications
Carbon steel flanges are available in various sizes, pressure classes, standards, facing types, and connection designs to meet different project requirements.
Good Weldability and Machinability
Carbon steel materials are easy to weld and machine, making installation, manufacturing, and maintenance more convenient.
Long Service Life
With proper surface treatment and maintenance, carbon steel flanges provide dependable sealing performance and a long operational life.
Applications
Oil and Gas Industry
Carbon steel flanges are widely used in oil and gas transmission pipelines, refineries, and processing facilities. Their high strength and pressure resistance provide reliable connections in demanding operating conditions.
Power Generation
Carbon steel flanges are commonly installed in steam, cooling water, and auxiliary piping systems. They offer stable performance under high-temperature and high-pressure service conditions.
Chemical Processing
Carbon steel flanges are suitable for transporting non-corrosive and mildly corrosive fluids in chemical plants. Their strong structure and dependable sealing help reduce leakage risks.
Petrochemical Plants
Petrochemical facilities use carbon steel flanges in process pipelines, storage systems, and pressure equipment. They provide reliable performance under changing pressure and temperature conditions.
Water Treatment
Carbon steel flanges are used in municipal water supply, wastewater treatment, pumping stations, and industrial water systems. Protective coatings can be applied to improve corrosion resistance.
Construction and Industrial Piping
Carbon steel flanges are widely used in industrial plants, heating systems, fire protection pipelines, and mechanical equipment. They are cost-effective, durable, and easy to manufacture in various sizes and pressure classes.
PRODUCTION PROCESS
Our carbon steel flanges are manufactured through a controlled production process from raw material inspection to final shipment. Every step is traceable through material identification, process records, dimensional inspection, heat treatment records, and final quality control.
This production process ensures stable quality, accurate dimensions, reliable sealing performance, and compliance with project specifications.
Why Choose Us
Comprehensive Fabricating Capabilities
We coordinated manufacturing, warm treatment, machining, testing, and bundling beneath one roof. You get steady quality control all through the whole generation process.
International Standards Compliance
Our products meet ASME, EN, DIN, JIS, and GOST standards. You can specify the exact requirements for your regional applications with confidence.
Extensive Estimate Run
From DN15 to DN4000, we cover essentially all mechanical necessities. Your ventures advantage from single-source obtainment convenience.
Quality Affirmation
Progressed testing offices guarantee each product meets details. You get certified items with total traceability documentation.
Global Trade Involvement
Our items serve markets over Europe and the Americas. You work with demonstrated providers who get it worldwide quality expectations.
Competitive Preferences
Prevalent quality, competitive estimating, secure bundling, and quick conveyance combine to back your extend timelines and budgets.
COMPANY PROFILE
Shanxi HongKai Forging Co., Ltd. Was located in Dingxiang County, known as the "Hometown of Forging Flanges" in Shanxi Province, which is part of Chinese energy and heavy chemical industrial base. The area boasts convenient transportation, abundant coal and power resources, fast communication, and an excellent environment. The company has three big workshops in total. We have 20 years experiences in flanges and forging industry, we can produce 20, 000MT per year. We have strength capacity to produce the flange in every process.
Along with capabilities in forging and heat treatment, integrated production capabilities including machining, physical and chemical testing, surface treatment, and packaging and shipment. Possessing solid technical expertise, advanced production processes, and a complete quality inspection, reliable after-sales service, for customers worldwide and domestically multiple clients have provided a solid foundation for collaboration.
The flanges manufactured by our company comply with the American standard ASME B16.5/B16.47, European Standard EN1092-1, German Standard DIN, Japanese Standard JIS, Russian
FAQ
What are carbon steel flanges?
Carbon steel flanges are forged or machined pipe connection components used to connect pipes, valves, pumps, fittings, and pressure equipment. They provide a reliable sealing surface and allow easy installation, inspection, maintenance, and disassembly of piping systems.
What materials are commonly used for carbon steel flanges?
Common carbon steel flange materials include ASTM A105, ASTM A105N, ASTM A350 LF2, ASTM A694 F42/F52/F60/F65/F70, and other project-specified carbon steel grades. ASTM A105 is widely used for forged carbon steel flanges in general pressure piping systems, while ASTM A350 LF2 is often selected for low-temperature service and ASTM A694 is used for high-pressure pipeline applications.
What standards are available for carbon steel flanges?
Carbon steel flanges can be manufactured according to ASME / ANSI, EN, DIN, JIS, BS, GOST, AWWA, and other international standards. Common standards include ASME B16.5 for flanges from NPS 1/2" to 24" and ASME B16.47 for large-diameter flanges from NPS 26" to 60".
What types of carbon steel flanges do you supply?
We supply many types of carbon steel flanges, including Weld Neck Flanges, Slip On Flanges, Blind Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, Plate Flanges, Orifice Flanges, Reducing Flanges, Long Weld Neck Flanges, Spade Flanges, Spacer Rings, and custom forged flanges.
What pressure classes are available?
Carbon steel flanges are available in different pressure classes, such as Class 150, 300, 400, 600, 900, 1500, and 2500 for ASME B16.5 flanges. Large-diameter ASME B16.47 flanges are commonly available in Class 75, 150, 300, 400, 600, and 900. The actual pressure capacity depends on material grade, temperature, size, and applicable standard.
What sealing face types can carbon steel flanges have?
Carbon steel flanges can be supplied with different sealing faces, including Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue and Groove, and Male and Female faces. RF and FF are commonly used in general piping systems, while RTJ is often used for high-pressure and high-temperature service.
Where are carbon steel flanges used?
Carbon steel flanges are widely used in oil and gas, petrochemical plants, power generation, water treatment, shipbuilding, chemical processing, mining, HVAC, and general industrial piping systems. They are suitable for connecting pipelines that require strength, durability, and reliable sealing performance.
What is the difference between ASTM A105 and ASTM A350 LF2 flanges?
ASTM A105 flanges are commonly used for general carbon steel pressure piping applications at ambient and high temperatures. ASTM A350 LF2 flanges are designed for low-temperature service and provide better impact toughness in cold environments. The right material should be selected according to operating temperature, pressure, and project specifications.
What is the difference between ASME B16.5 and ASME B16.47 carbon steel flanges?
ASME B16.5 covers pipe flanges and flanged fittings from NPS 1/2" to 24", while ASME B16.47 covers large-diameter steel flanges from NPS 26" to 60". ASME B16.47 is mainly used for large-diameter weld neck flanges and blind flanges in pipeline and heavy industrial applications.
Can carbon steel flanges be customized?
Yes. Carbon steel flanges can be customized according to drawings, samples, project standards, material requirements, surface treatment, drilling patterns, thickness, bore size, facing type, and special dimensions. Custom forged flanges are available for non-standard piping systems and special engineering projects.
What surface treatments are available for carbon steel flanges?
Common surface treatments include black paint, anti-rust oil, yellow paint, hot-dip galvanizing, cold galvanizing, epoxy coating, and other protective coatings. The surface treatment can be selected according to storage conditions, transportation requirements, and the working environment.
Contact Us
Quality Carbon steel flanges solutions ensure your piping systems operate safely and efficiently for years to come.Ready to discuss your product requirements? Contact our technical team at kevin.zhao@hkflange.com for expert guidance and competitive pricing.
Clear Communication, and Reliable Technical Support