Alloy Steel Welding Neck Flange ASME/AISI B16.5 Weld Neck Flat Face Flange

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW
• Type: Flat Welding
• Structure: Flanges
• Connection: Flanged
• Sealing Surface: FF, RF, FM, Rj,Tg,Mfm
• Manufacturing Way: Forging
• Certificate: ISO9001
• 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 30 Years Experience
• Transport Package: Customized
• Specification: 1/2"-24"
• Trademark: GUCHENG
• Origin: Dingxiang
• HS Code: 73079100
• Production Capacity: 50000 Pieces/Year

Product Description

Product Description

Flat welding flange is a flange connected with container or pipeline by fillet weld. It is an arbitrary type flange.
1. According to the degree of integrity of the connection between the flange ring and the straight cylinder section, the flange is checked separately according to the integral type or loose type.
2. Flange rings are available with neck and without neck. Compared with the welding neck flange, the flat welding flange has simple structure and saves materials, but its stiffness and sealing are not as good as the neck welding flange.
3. Flat welded flange is widely used in the connection of medium and low pressure vessels and pipelines

Key Features:
1.  The flat welding flange not only saves space and reduces weight, but also ensures that the joint will not leak and has good sealing performance.
2. The compact flange size is reduced because the diameter of the seal is reduced, which will reduce the cross section of the sealing surface.
3. The flange gasket has been replaced by a sealing ring to ensure that the sealing face matches the sealing face. In this way, only a small amount of pressure is needed to compress the cover tightly. With the reduction of the required pressure, the size and number of bolts can be reduced accordingly, so the final design of a small size and light weight (compared with the traditional flange weight reduction of 70% ~ 80%) of the new product.

Standard Specification:
Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Size: 1/2" (15 NB) to 48" (1200NB)
Class: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
BS: BS4504 , BS4504, BS1560, BS10
Flange Face Type: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Material: Stainless Steel, Carbon Steel, Low-Temperature Carbon Steel, Alloy Steel, ECT.
Surface treatment: Anti-rust oil, transparent/yellow/black, Anti-rust paint, Zinc, Hot dipped galvanized
Usage: Oil field, Offshore, Water system, Shipbuilding, Natural gas, Electric power, Pipe projects, etc. 

Pipe		Flange theoretical weight (kg)				Single head bolt configuration								Configuration of nut
Nominal diameter	Outer diameter	Pipe pressure				0.6MPa		1.0MPa		1.6MPa		2.5MPa		Hexagon nut (crude) GB41-76		Hexagon nut GB52-76
		0.6MPa	1.0MPa	1.6MPa	2.5MPa	Qty * Dia * L	Weight (kg)	Qty * Dia * L	Weight (kg)	Qty * Dia * L	Weight (kg)	Qty * Dia * L	Weight (kg)	Qty * Dia * L	Weight (kg)	Qty * Dia * L	Weight (kg)
10	14	0.313	0.458	0.547	0.634	4*10*40	0.14008	4*12*40	0.19716	4*12*50	0.23268	4*12*50	0.23268	1000*6*5	2.32	1000*1.6*5	0.075
15	18	0.335	0.511	0.711	0.804	4*10*40	0.14008	4*12*40	0.19716	4*12*50	0.23268	4*12*50	0.23268	1000*8*5	5.67	1000*2*5	0.119
20	25	0.536	0.748	0.867	0.985	4*10*50	0.16472	4*12*50	0.23268	4*12*50	0.23268	4*12*60	0.2682	1000*10*5	10.99	1000*2.5*5	0.22
25	32	0.641	0.89	1.174	1.174	4*10*50	0.16472	4*12*50	0.23268	4*12*60	0.2682	4*12*60	0.2682	1000*12*5	16.32	1000*3*5	0.393
32	38	1.097	1.4	1.6	1.96	4*10*50	0.16472	4*16*60	0.4884	4*16*60	0.4884	4*16*60	0.4884	1000*14*5	25.28	1000*4*5	0.844
40	45	1.219	1.71	2	2.6	4*10*50	0.16472	4*16*60	0.4884	4*16*60	0.4884	4*16*70	0.5516	1000*16*5	34.12	1000*5*5	1.24
50	57	1.348	2.09	2.61	2.71	4*10*50	0.16472	4*16*60	0.4884	4*16*70	0.5516	4*16*70	0.5516	1000*18*5	44.19	1000*6*5	2.317
65	73	1.67	2.84	3.45	3.22	4*10*50	0.16472	4*16*60	0.4884	4*16*70	0.5516	8*16*70	1.1032	1000*20*5	61.91	1000*8*5	5.674
80	89	2.48	3.24	3.71	4.06	4*10*60	0.18936	4*16*60	0.4884	8*16*70	1.1032	8*16*80	1.2296	1000*22*5	75.94	1000*10*5	10.99
100	108	2.89	4.01	4.8	6	4*16*60	0.4884	8*16*70	1.1032	8*16*80	1.2296	8*20*80	2.0368	1000*24*5	111.9	1000*12*5	16.32
125	133	3.94	5.4	6.47	8.26	4*16*60	0.4884	8*16*70	1.1032	8*16*80	1.2296	8*22*90	2.7152	1000*27*5	168	1000*14*5	25.28
150	159	4.47	6.12	7.92	10.4	8*16*60	0.9768	8*20*80	2.0368	8*20*80	2.0368	8*22*90	2.7152	1000*30*5	234.2	1000*16*5	34.12
175	194	5.54	7.44	8.81	11.9	8*16*70	1.1032	8*20*80	2.0368	8*20*80	2.0368	12*22*100	4.4304	1000*36*5	370.9	1000*18*5	44.19
200	219	6.07	8.24	10.1	14.5	8*16*70	1.1032	8*20*80	2.0368	12*20*90	3.3504	12*22*100	4.4304	1000*42*5	598.6	1000*20*5	61.91
225	245	6.6	9.3	11.7	17	8*16*70	1.1032	8*20*80	2.0368	12*20*90	3.3504	12*27*100	7.3116	1000*48*5	957.3	1000*22*5	75.94
250	273	8.03	10.7	15.7	19.9	12*16*70	1.6548	12*20*80	3.0552	12*22*90	4.0728	12*27*100	7.3116	1000*56*5	1420	1000*24*5	111.9
300	325	10.3	12.9	18.1	26.8	12*20*80	3.0552	12*20*80	3.0552	12*22*90	4.0728	16*27*110	10.4688	1000*64*5	1912	1000*27*5	168
350	377	12.59	15.9	23.3	34.35	12*20*80	3.0552	16*22*90	5.4304	16*22*100	5.9072	16*30*120	14.0048	1000*72*5	2584	1000*30*5	234.2
400	426	15.2	21.8	31	44.9	16*20*80	4.0736	16*22*90	5.4304	16*27*110	10.4688	16*30*130	14.8928	1000*80*5	3393	1000*36*5	370.9
450	478	17.59	24.4	40.2	51.92	16*20*80	4.0736	20*22*90	6.788	20*27*120	13.986	20*30*130	18.616	1000*90*5	4872	1000*42*5	598.6
500	529	20.67	27.7	55.1	67.3	16*20*90	4.4672	20*22*90	6.788	20*30*130	18.616	20*36*150	31.32	1000*100*5	6732	1000*48*5	957.3
600	630	26.57	39.4	80.3	-	20*20*90	5.584	20*27*110	13.086	20*36*140	29.72	-

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.).