Basic Info.
Standard
ANSI, DIN, GB, JIS, GOST, BSW
Pressure
150# 300# 400# 600# 900# 1500# 2500#
Usage
Suitable for Water, Oil and Gas Industrial
Connection Endstsocket Weld or Threaded
NPT, Bsp, BSPT etc
Factory
Over 25 Years Experience
Transport Package
Customized
Product Description
ANSI B16.5 FORGING FLANGE -- Class 1500 Welding Neck Flange
Welding neck flanges are a type of flange designed for high-stress applications. They feature a long, tapered neck that allows for a smooth transition from the flange to the pipe, ensuring a strong, leak-proof weld connection. This design makes them particularly suitable for high-pressure and high-temperature environments.
According to ASME B16.5, the hub of the welding neck flange can be roughly divided into a tapered portion and a straight length. The straight length of 6 mm is machined to precisely match with the adjoining pipe so that the welding can be done conveniently. Weld neck flanges are bored to match the inside diameter of the adjoining pipe. The thinner the wall of the pipe, the larger the bore through the flange. The thicker the wall of the pipe, the smaller the bore. Because of these matching relationship, there is no restriction to the flow. Turbulence and erosion are therefore eliminated.
The ASME B16.5 welding neck flange shall be furnished with cut square end when wall thickness is less than 5 mm, plain bevel end when wall thickness is from 5 mm to 22 mm inclusive, or compound bevel end when wall thickness is greater than 22 mm. The butt welding ends shall be machined in accordance with the requirements of ASME B16.25. The dimensions and tolerances of plain bevel and compound bevel are illustrated in below two drawings. In particular, the wall thickness t shall conforming to the adjoining pipe's wall thickness requirement; a root face in width f of 2 mm shall be machined at the top of the bevel with tolerance of ±1 mm.
Three most common facing types are available including flat face (FF), raised face (RF), and ring joint face (RTJ). Welding neck flanges are normally used in severe service applications involving high pressures, high temperatures, large external loads or cryogenic conditions.
Product Parameters
| | |
Slip-On Flange (SO) | Weld Neck Flange (WN) | Socket Weld Flange (SW) |
| | |
Threaded Flange (TH) | Lap Joint Flange (LJ) | Blind Flange (BL) |
Nominal Pipe Size | Outside Diam. | Diam. at Base of Hub | 0.D.of Raised Face | Thickness | BORF | LENGTH THRU HUB | Diam.of Hub at Bevel | Radius of Fillet | Thread Length |
Welding Neck Socket Welding | Slip-on Socket Welding | Lap Joint | Counter Bore MIn. | Welding Neck | Slip-on Threaded Socket Welding | Lap Joint |
D | X | G | t | B1 | B2 | B3 | B | T1 | T2 | T3 | A | R | Q |
1/2 | 121 | 38.1 | 35.1 | 22.4 | See Nole(1) To be specified by purchaser. | 22.4 | 22.9 | 23.6 | 60.5 | 31.8 | 31.8 | 21.3 | 3.0 | 22.4 |
3/4 | 130 | 44.5 | 42.9 | 25.4 | 27.7 | 28.2 | 29.0 | 69.9 | 35.1 | 35.1 | 26.7 | 3.0 | 25.4 |
1 | 149 | 52.3 | 50.8 | 28.4 | 34.5 | 35.1 | 35.8 | 73.2 | 41.1 | 41.1 | 33.5 | 3.0 | 28.4 |
1 1/4 | 159 | 63.5 | 63.5 | 28.4 | 43.2 | 43.7 | 44.5 | 73.2 | 41.1 | 41.1 | 42.2 | 4.8 | 30.2 |
1 1/2 | 178 | 69.9 | 73.2 | 31.8 | 49.5 | 50.0 | 50.5 | 82.6 | 44.5 | 44.5 | 48.3 | 6.4 | 31.8 |
2 | 216 | 104.6 | 91.9 | 38.1 | 62.0 | 62.5 | 63.5 | 101.6 | 57.2 | 57.2 | 60.5 | 7.9 | 38.1 |
2 1/2 | 244 | 124.0 | 104.6 | 41.1 | 74.7 | 75.4 | 76.2 | 104.6 | 63.5 | 63.5 | 73.2 | 7.9 | 47.8 |
3 | 267 | 133.4 | 127.00 | 47.8 | 90.7 | 91.4 | 92.2 | 117.3 | 73.2 | 73.2 | 88.9 | 9.7 | 50.8 |
4 | 311 | 162.1 | 157.2 | 53.8 | 116.1 | 116.8 | 117.6 | 124.0 | 90.4 | 90.4 | 114.3 | 11.2 | 57.2 |
5 | 375 | 196.9 | 185.7 | 73.2 | 143.8 | 144.5 | 144.5 | 155.4 | 104.6 | 104.6 | 141.2 | 11.2 | 63.5 |
6 | 394 | 228.6 | 215.9 | 82.6 | 170.7 | 171.5 | 171.5 | 171.5 | 119.1 | 119.1 | 168.4 | 12.7 | 69.9 |
8 | 483 | 292.1 | 269.7 | 91.9 | 221.5 | 222.3 | 222.3 | 212.9 | 142.7 | 142.7 | 219.2 | 12.7 | 76.2 |
10 | 584 | 368.3 | 323.9 | 108.0 | 276.4 | 277.4 | 276.4 | 254.0 | 158.8 | 177.8 | 273.1 | 12.7 | 84.1 |
12 | 673 | 450.9 | 381.0 | 124.0 | 327.2 | 328.2 | 328.7 | 282.4 | 180.8 | 218.9 | 323.9 | 12.7 | 91.9 |
14 | 749 | 495.3 | 412.8 | 133.4 | 359.2 | 360.2 | 360.4 | 298.5 | | 241.3 | 355.6 | 12.7 | |
16 | 826 | 552.5 | 469.9 | 146.1 | 410.5 | 411.2 | 411.2 | 311.2 | | 260.4 | 406.4 | 12.7 | |
18 | 914 | 596.9 | 533.4 | 162.1 | 461.8 | 462.3 | 462.0 | 327.2 | | 276.4 | 457.2 | 12.7 | |
20 | 984 | 641.4 | 584.2 | 177.8 | 513.1 | 514.4 | 512.8 | 355.6 | | 292.1 | 508.0 | 12.7 | |
24 | 1168 | 762.0 | 692.2 | 203.2 | 616.0 | 616.0 | 614.4 | 406.4 | | 330.2 | 609.6 | 12.7 | |
Nominal Pipe Sze | Depth of Socket | DRILLING | BOLTING | APPROXIMATE WEIGHT |
Diam. of Bolt (inch) | Stud Bolt Length |
Bolt Circle Diam. | Number of Holes | Diam. of Holes | 0.25 Raised Face | Male- Female Tongue -Groove | Ring Joint | Welding Neck | Slip-on and Threaded | Lap Jolnt | Blind | Socket Welding |
Y | Kg | Ib | Kg | Ib | Kg | Ib | Kg | Ib | Kg | Ib |
1/2 | 9.7 | 82.6 | 4 | 22.4 | 3/4 | 108.0 | 101.6 | 108.0 | 2.10 | 4.60 | 1.80 | 4.00 | 1.80 | 4.00 | 1.90 | 4.00 | 1.81 | 4.00 |
3/4 | 11.2 | 88.9 | 4 | 22.4 | 3/4 | 114.3 | 108.0 | 114.3 | 2.72 | 6.00 | 2.27 | 5.00 | 2.27 | 5.00 | 2.72 | 6.00 | 2.81 | 6.20 |
1 | 12.7 | 101.6 | 4 | 25.4 | 7/8 | 127.0 | 120.7 | 127.0 | 3.86 | 8.50 | 3.40 | 7.50 | 3.40 | 7.50 | 4.08 | 9.00 | 3.61 | 8.00 |
1 1/4 | 14.2 | 111.3 | 4 | 25.4 | 7/8 | 127.0 | 120.7 | 127.0 | 4.54 | 10.00 | 4.10 | 9.00 | 4.09 | 10.80 | 4.30 | 9.50 | 4.99 | 11.00 |
1 1/2 | 15.7 | 124.0 | 4 | 28.4 | 1 | 139.7 | 133.4 | 139.7 | 5.90 | 13.00 | 5.45 | 12.00 | 5.40 | 11.90 | 5.90 | 13.00 | 6.76 | 14.90 |
2 | 17.5 | 165.1 | 8 | 25.4 | 1 7/8 | 146.1 | 139.7 | 146.1 | 10.89 | 24.00 | 10.50 | 23.00 | 9.53 | 21.00 | 11.30 | 25.00 | 10.89 | 24.00 |
2 1/2 | 19.1 | 190.5 | 8 | 28.4 | 1 | 158.8 | 152.4 | 158.8 | 16.34 | 36.00 | 15.80 | 34.80 | 13.15 | 29.00 | 16.00 | 35.30 | 16.34 | 36.00 |
3 | 20.6 | 203.2 | 8 | 31.8 | 1 1/8 | 177.8 | 171.5 | 177.8 | 21.79 | 48.00 | 21.77 | 48.00 | 17.24 | 38.00 | 21.79 | 48.00 | | |
4 | 23.9 | 241.3 | 8 | 35.1 | 1 1/4 | 196.9 | 190.5 | 196.9 | 31.30 | 69.00 | 31.00 | 68.40 | 29.00 | 63.90 | 33.11 | 73.00 | | |
5 | 23.9 | 292.1 | 8 | 41.1 | 1 1/2 | 247.7 | 241.3 | 247.7 | 59.02 | 130.00 | 58.80 | 129.60 | 54.00 | 119.00 | 60.00 | 132.30 | | |
6 | 26.9 | 317.5 | 12 | 38.1 | 1 3/8 | 260.4 | 254.0 | 266.7 | 74.91 | 165.00 | 74.00 | 163.00 | 62.00 | 136.70 | 75.00 | 165.30 | | |
8 | 31.8 | 393.7 | 12 | 44.5 | 1 5/8 | 292.1 | 285.8 | 323.9 | 123.83 | 273.00 | 117.73 | 258.00 | 129.73 | 236.00 | 136.98 | 302.00 | | |
10 | 33.3 | 482.6 | 12 | 50.8 | 1 7/8 | 336.6 | 330.2 | 342.9 | 205.93 | 454.00 | 197.49 | 435.40 | 220.19 | 485.40 | 229.97 | 507.00 | | |
12 | 39.6 | 571.5 | 16 | 53.8 | 2 | 374.7 | 368.3 | 387.4 | 306.00 | 674.60 | 264.00 | 582.00 | 286.02 | 630.60 | 316.00 | 696.70 | | |
14 | 41.4 | 635.0 | 16 | 60.5 | 2 1/4 | 406.4 | 400.1 | 425.5 | 416.00 | 917.00 | | | 404.06 | 890.80 | 421.00 | 928.00 | | |
16 | 44.5 | 704.9 | 16 | 66.5 | 2 1/2 | 444.5 | 438.2 | 469.9 | 567.50 | 1250.00 | | | 522.10 | 1151.00 | 559.00 | 1232.70 | | |
18 | 49.3 | 774.7 | 16 | 73.2 | 2 3/4 | 495.3 | 489.0 | 527.1 | 736.00 | 1622.60 | | | 669.65 | 1476.30 | 761.00 | 1677.70 | | |
20 | 54.1 | 831.9 | 16 | 79.2 | 3 | 539.8 | 533.4 | 565.2 | 929.00 | 2048.00 | | | 805.85 | 1776.60 | 967.00 | 2131.80 | | |
24 | 63.5 | 990.6 | 16 | 91.9 | 3 1/2 | 616.0 | 609.6 | 647.7 | 1504.00 | 3315.70 | | | 1285.55 | 2834.00 | 1568.00 | 3456.80 | | |
Notes:(1) For the inside diameter of pipes (corresponding to 'Bore' (B1) of Welding Neck Flanges, refer to page 60.
(2) Class 1500 flanges except Lap Joint will be furnished with a 0.25" (6.35mm) raised face, which is not included in 'thickness' (t) and 'Length through Hub' (T1),(T2).
(3) For Slip-on, Threaded, Lap Joint, and Socket Welding Flanges, the hubs can be shaped either vertically from base to top tapered within the limits of 7 degrees.
(4) Blind Flanges may be made with the same hub as that used for Slip-on Flanges or without a hub.
(5) The gasket suface and backside(bearing surface for boltng)are made paralle within 1 degree. To accomplish parallelism, spot-facing is carried out according to MSS SP-9, without reducing thickness (t).
(6) Dimensions of sizes 1/2" through 2-1/2" are the same as for Class 900 Flanges.
(7) Depth of Socket (Y) is covered by ANSI B16.5 only in size through 1/2 inch, over 2-1/2 inch is at the manufacturers' option.
ANSI B16.5 FORGED FLANGES TOLERANCE
THREAD,SOCKET-WELDING, SLIP-ON,LAP JOINT AND BLIND. | WELDING NECK |
|
Outside Diameter | When O.D.is 24"or less | ±1/16"(1.6mm) | Outside Diameter | When O.D.is 24"or less | ±1/16"(1.6mm)* |
When O.D.is Over 24" | ±1/8"(3.2mm)* | When O.D.is Over 24" | ±18"(3.2mm) |
Inside Diameter | Threaded | Within limits on boring gauge | Inside Diameter | 10"and Smaller | ±1/32"(0.8mm) |
20"thru 18" | ±1/16"(1.6mm) |
Socket-Welding Slip-on and Lap joint | 10"&Smaller +1/32"(0.8mm).0" 12"&Larger +1/16"(1.6mm).O" | 20"and Larger | +1/8"(3.2mm) -1/16"(1.6mm) |
Outside Diameter of Hub | 5"and Smaller | +3/32"(2.4mm) -1/32"(0.8mm) | Diameter of Hub at Base | When Hub Base is 24"or Smaller | ±1/16"(1.6mm)* |
6"and Larger | +5/32"(4.0mm) -1/32"(0.8mm) | When Hub Base is Over 24" | ±1/8"(3.2mm)* |
Diameter of Contact Face | 1/16"Raised Face | ±1/32"(0.8mm) | Diameter of Contact Face | 116"Raised Face | ±1/32"(0.8mm) |
1/4"Raised Face Tongue & Groove Male,Female | ±1/64"(0.4mm) | 14"Raised Face Tongue &Groove Male,Female | ±1/64"(0.4mm) |
Diameter of Counterbore | Same as for Inside Diameter | Diameter of Hub at Point of Welding | 5"and Smaller | +3/32"(2.4mm)* -1/32"(0.8mm) |
6"and Larger | +5/32"(4.0mm) -1/32"(0.8mm) |
Drilling | Bolt Circle | ±1/16"(1.6mm) | Drilling | Bolt Circle | ±1/16"(1.6mm) |
Bolt Hole Spacing | ±1/32"(0.8mm) | Bolt Hole Spacing | ±1/32"(0.8mm) |
Eccentricity of Bolt Circle with Respect to Facing | 21/2"Smaller 1/32"(0.8mm)Max. 3"&Larger 1/16"(1.6mm)Max | Eccentricity of Bolt Circle with Respect to Facing | 21/2"Smaller 1/32"(0.8mm)Max. 3"&Larger 1/16"(1.6mm)Max. |
Eccentricity of Bolt Circle with Respect to Bore | 1/32"(0.8mm)Max.* | Eccentricity of Bolt Circle with Respect to Bore | 1/32"(0.8mm)Max.* |
Eccentricity of Facing with Respect to Bore | 1/32"(0.8mm)Max.* | Eccentricity of Facing with Respect to Bore | 1/32"(0.8mm)Max.* |
Thickness | 18"and Smaller | +1/8"(3.2mm).0^ | Thickness | 18"and Smaller | +1/8"(3.2mm),0" |
20"and Larger | +3/16"(4.8mm).04 | 20"and Larger | +3/16"(4.8mm).O |
Length Thru Hub | 10"and Smaller | ±1/16"(1.6mm) | Length Thru Hub | 10"and Smaller | ±1/16"(1.6mm) |
12"and Larger | ±1/8"(3.2mm) | 12"and Larger | ±1/8"(3.2mm) |
Notes:
This tolerance is not covered in ANSI B16.5, but maker's option.STANDARD FINISHES for Face of Flange (ANSI B16.5)
STOCK FINISH:The most widely used gasket finish.because practically is suitable for all ordinary service conditions. This is a continuous spiral groove. Flanges size 12" (304.8mm)and smaller are produced with a 1/16" round-nosed tool at a feed of 1/32" per revolution. For sizes 14" (355.6mm)and larger. the finish is made with a 1/8" round-nosed tool at a feed of 3/64" per revolution.SPIRAL SERRATED OR PHONOGRAPHIC:This finish is produced by using a 90°round-nosed tool.CONCENTRIC SERRATED:This finish is produced by using a 90°round-nosed tool.SMOOTH FINISH:The cutting tool employed shall have an approximate 0.06"radius.The resultant surface finish shall have a 125μ inch to 250μ inch(ANSI B16.5 para 6.4;4.1)1. RAISED FACE AND LARGE MALE AND FEMALE A serrated-concentric or serrated-spiral finish with 34 to 64 grooves per inch is used. The cutting tool employed has an approximate 0.06 in.radius.The resultant surface finish shall have a 125μ inch(3.2m)to 500μ inch(12.5μm) approximate roughness.2. TONGUE AND GROOVE AND SMALL MALE AND FEMALE The gasket contact surface does not exceed 125μ in. (3.2μm)roughness3. RING JOINT The inside wall surface of the gasket groove does not exceed 63μin.(1.6μm)roughness,4. BLIND Blind flanges need not be faced in the center if, when this center part is raised, its diameter is at least 1 in. smaller than the inside diameter of the corresponding pressure class fittings. When the center part is depressed, its diameter is not greater than the inside diameter of the corresponding pressure class fittings. Machining of the depressed center is not required.The manufacturing process of
forged flanges begins with the selection of high-quality steel, which is heated and shaped under high pressure in forging dies to enhance its strength and durability. After forging, the flanges are trimmed, heat-treated to relieve internal stresses, and precisely machined to meet the required dimensions. They undergo rigorous inspection and testing for quality assurance, followed by surface treatments for enhanced corrosion resistance. This process results in flanges that are strong, reliable, and suitable for demanding industrial environments.
Company Profile
Dingxiang Country Gu Cheng Forging Company Ltd. is a leading manufacturer in Dingxiang County, Shanxi Province, known as the "Forging Capital of China." Established with a deep-rooted history in forging, we specialize in producing high-quality flanges and forged components for a wide range of industrial applications. Our extensive product line includes ANSI, DIN, JIS, and EN standard flanges and customized forged parts designed to meet specific customer requirements.
Gu Cheng Forging with over 30 years of experience in producing high-quality forged flanges. Including Weld Neck Flange (WN), Slip-On Flange (SO), Blind Flange (BL), Socket Weld Flange (SW), Lap Joint Flange, Plate Flange, and Customized forged flange.
At Gu Cheng Forging, we serve a global market, providing flanges and forged components for industries such as oil and gas, chemical processing, power generation, shipbuilding, and more. We pride ourselves on our ability to deliver tailored solutions, meeting the highest standard of safety, performance, and efficiency.
As a factory, we can tailor flanges based on your specific requirements for size, material, pressure rating, and surface treatment (galvanization, black paint, etc.). By preventing rust and deterioration, the coating enhances the flange's performance, offering long-term resilience and reducing maintenance needs over time.
Dingxiang Country Gu Cheng Forging Company Ltd, strives to be a trusted partner for all your forging needs, ensuring long-term cooperation and mutual success.
Q1: Are you a manufacturer or a trading company?
A1: We are a professional manufacturer with over 30 years of experience in forging flanges. Our factory is located in Dingxiang, China, known as the "Forging Capital." We produce high-quality, customized forged flanges, offering factory-direct pricing and ensuring top-notch quality.
Q2: What types of flanges do you produce?
A2: We manufacture a wide range of forged flanges, including:
- Weld Neck Flange (WN)
- Slip-On Flange (SO)
- Blind Flange (BL)
- Socket Weld Flange (SW)
- Threaded Flange (TH)
- Lap Joint Flange
- Plate Flange
All our flanges comply with international standards such as ASME, DIN, JIS, and BS.Q3: What materials do you use?
A3: We offer flanges in a variety of materials, including:- Carbon Steel
- Stainless Steel
- Alloy Steel
Each material is sourced from certified suppliers, ensuring durability and performance in diverse industrial applications.
Q4: Can you provide customized flanges?
A4: Absolutely! As a factory, we specialize in customization. We can tailor flanges based on your specific requirements for size, material, pressure rating, and surface treatment (galvanization, black paint, etc.).
Q5: How do you ensure the quality of your products?
A5: Quality is our top priority. Every flange undergoes a strict inspection process, including:
- Material analysis
- Dimensional checks
- Pressure testing
- Surface treatment inspections
Our CNC machining ensures precise dimensions, and we adhere to strict international standards throughout the manufacturing process.
Address:
Liuhui Industrial Zone, Nanwang Township, Dingxiang County, Xinzhou, Shanxi, China
Business Type:
Manufacturer/Factory
Business Range:
Manufacturing & Processing Machinery
Management System Certification:
ISO 9001
Company Introduction:
Shanxi Dingxiang County Gucheng Forging Co., Ltd. is located in China′s energy heavy chemical industry base, Dingxiang County, the forging town in the northwest of Shanxi Province. The company′s address is located in the small industrial zone of Liuhui, Hanyang Ancient City, close to Kushiro. Wutai Mountain, a Buddhist holy place, has convenient road and rail transportation, rich coal power resources, fast communication facilities and excellent geographical conditions. The company was founded in 1996 with a registered capital of 5.01 million yuan, fixed assets of 18 million yuan, more than 200 workers and an annual output of 100, 000. Tons of strength.
The flanges produced by our company implement the national standard JB, HG, DG and other standards, and implement the standards of American standard ANSI B16.5, German standard DIN, British standard BS4504, Japanese standard JIS, B2220, B2210, Italian standard UNI and so on. The main varieties are: Welding, lap joint, socket, sliding sleeve, thread, blind plate, flat plate and other seven varieties, 1/2"-64" more than 20 kinds of specifications. The products meet the domestic petroleum, chemical, machinery, electric power, coal mining and other industries, and are exported to Japan, South Korea, Canada, Southeast Asia, South America, Western Europe and other countries and regions, winning the trust of customers at home and abroad.
In the future, the company will strengthen the friendly cooperation with customers at home and abroad with a new attitude, adhere to the principle of mutual benefit and common development, and create a bright future. We warmly welcome customers from all walks of life to come and negotiate business.