Weld neck flanges

Weld neck flanges are a type of flange with a distinctive elongated conical neck designed for butt-welding directly to the pipe end. This design ensures a smooth and gradual transition from the flange to the pipe, which significantly reduces stress concentration in the connection area, thereby increasing its strength and durability. Weld neck flanges are commonly used in pipelines operating under high pressure and elevated temperature conditions.

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Nominal size, NPS (inch)
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Type of connecting surface
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Name	Center distance of mounting holes, K (mm)	Collar diameter at base, N (mm)	Collar height, H2 (mm)	Diameter of the collar for welding, A (mm)	Flange thickness, C2 (mm)	Flange type	Hole diameter, L (mm)	Material	Nominal diameter, DN	Nominal size, NPS (inch)	Number of holes, n	Radius of curvature, R1 (mm)	Standard	Steel grade	Thread	Type of connecting surface	Weight 1 pc (kg)
Weld neck flange DN200 PN250 Type 11/F EN 1092-1	400	305	190	244.5	82	Type 11 - weld neck	42	Black	200	—	12	10	EN 1092-1	P245GH / 1.0352	M39	Type F - with recess	110
Weld neck flange DN200 PN250 Type 11/F EN 1092-1	400	305	190	244.5	82	Type 11 - weld neck	42	Black	200	—	12	10	EN 1092-1	P235GH / 1.0345	M39	Type F - with recess	110
Weld neck flange DN200 PN250 Type 11/F EN 1092-1	400	305	190	244.5	82	Type 11 - weld neck	42	Black	200	—	12	10	EN 1092-1	S355J2 / 1.0577	M39	Type F - with recess	110
Weld neck flange DN200 PN250 Type 11/F EN 1092-1	400	305	190	244.5	82	Type 11 - weld neck	42	Black	200	—	12	10	EN 1092-1	S235JR / 1.0038	M39	Type F - with recess	110
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X2CrNiMo17-12-3 / 1.4432	M39	Type F - with recess	145
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X2CrNiMoN25-7-4 / 1.4410	M39	Type F - with recess	145
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X1NiCrMoCuN25-20-7 / 1.4529	M39	Type F - with recess	145
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X2CrNiMoN22-5-3 / 1.4462	M39	Type F - with recess	145
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X1NiCrMoCu25-20-5 / 1.4539	M39	Type F - with recess	145
Stainless steel weld neck flange DN150 PN400 Type 11/F EN 1092-1	390	302	0	219.1	105	Type 11 - weld neck	0	Stainless steel	150	—	12	10	EN 1092-1	X1CrNiMoCuN20-18-7 / 1.4547	M39	Type F - with recess	145

Weld neck flanges made from carbon, alloy, corrosion-resistant, duplex, and super duplex steels in accordance with ASME standards. Available in various diameters and configurations. Reliable performance in aggressive environments. Delivery to the destination point. ASME weld neck flanges are used in pipeline systems in the oil and gas, petrochemical, and power generation sectors, where connections must withstand high pressure, extreme temperatures, and aggressive chemical environments. The products are manufactured from corrosion-resistant, heat-resistant, and high-alloy steels, including duplex and super duplex alloys. All products comply with international standards such as ASME B16.5, ASME B16.47, and EN, ensuring reliable operation even under the most demanding conditions. Supplies are delivered in bulk for industrial facilities with adherence to project timelines.

ASME weld neck flanges: features and advantages

The design of an ASME weld neck flange ensures a strong and leak-tight pipeline connection, minimizing the risk of leakage and reducing stress on the system. Steels that comply with ASTM A105 (carbon steel) and ASTM A182 (stainless and alloy steels) standards allow pipelines transporting hot oil, gas, and aggressive chemical substances to operate safely. These flanges offer high mechanical strength, resistance to corrosion, deformation, and thermal stress, making them an optimal solution for facilities with demanding operating conditions.

Slip-on and weld neck ASME flanges: what is the difference

Slip-on ASME flanges are used in pipelines with moderate loads and temperatures. Their design simplifies installation and integration into existing systems.

ASME welding neck flanges create a monolithic connection with the pipe, ensuring maximum strength, tightness, and resistance to extreme pressure, temperature, and aggressive chemical environments.

All products are manufactured in accordance with international standards such as ASME B16.5, ASME B16.47, and ASTM A182, ensuring long service life, compatibility with pipeline systems, and full compliance with industrial project requirements.

FAQ

1. What is the difference between a weld neck flange and a slip-on flange?

The main difference is the presence of the neck. A weld neck flange is butt-welded to the pipe and can withstand high pressure and vibration, while a slip-on flange is suitable for systems with lower loads.

2. Where are steel weld neck flanges used?

These flanges are used in petrochemical and gas pipelines, especially under conditions of high pressure and temperature.

3. How can I find out the price of a weld neck flange?

The price depends on the diameter, material, design type, and order volume. Current prices are available on the product pages of the website.

4. What materials are weld neck flanges made from?

The most common materials are carbon steel, stainless steel, and alloy steels. The material is selected depending on the operating environment and temperature.

5. What designs are available for weld neck flanges?

Weld neck flanges are produced in several designs that differ in sealing surface shape, type of bolt holes, and the presence of a raised face. The correct design is selected based on pipeline operating conditions and the type of connected equipment.

Comments

Comment 1: We are planning to order steel weld neck flanges in bulk. Do you offer discounts for large quantities?

Yes, we offer special conditions for wholesale customers. Please send the required quantity and sizes, and we will calculate a personalized price.

Comment 2: Could you advise which types of weld neck flange designs you offer? Is it possible to select according to DIN?

Our catalog includes weld neck flanges in various designs, including standard types, raised face versions, and welding configurations. All products comply with ASME requirements. Please specify the diameter and material, and we will help you select the appropriate option.

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