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304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500

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304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500

Brand Name : Yuhao

Model Number : flanges

Certification : ISO, API, BV, CE ...

Place of Origin : China

MOQ : 100KGS

Price : Negotation

Payment Terms : L/C,D/A,D/P,T/T,Western Union,MoneyGram

Supply Ability : 2000tons/per month

Delivery Time : 2-10 work days

Packaging Details : They are usually packed in conventional export wooden cases.

Material : 304, 304L, 306, 306L, 316, 316L

Application : Connection, Decoration, oil and gas, Automative, New Energy

Standard : ASTM, AISI, GB, JIS

Flange face type : RF (Raised Face), RTJ (Ring Type Joint)

Package : Standard Seaworthy Packagel, wooden cases...

Connection : Welding

Pressure : Class150/300/600/9001500/2500

Dimensions : 1/2”, 2”, 3”, 4”, 6”, 8”, 10”, up to 24”

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Stainless Steel Weld Neck Flange JIS RF 1/2" to 24" ISO, API, BV, CE ...
Product Specifications
Attribute Value
Material 304, 304L, 306, 306L, 316, 316L
Application Connection, Decoration, Oil and Gas, Automotive, New Energy
Standard ASTM, AISI, GB, JIS
Flange Face Type RF (Raised Face), RTJ (Ring Type Joint)
Package Standard Seaworthy Packaging, Wooden Cases
Certification ISO, API, BV, CE
Connection Welding
Pressure Class150/300/600/9001500/2500
Dimensions 1/2", 2", 3", 4", 6", 8", 10", up to 24"
Brand Name Yuhao
Product Description

The weld neck flange is characterized by its extended, conically tapered hub, which is specifically engineered for butt-welding to a pipe or pressure vessel nozzle. This design facilitates a full-penetration, circumferential butt weld that ensures optimal mechanical strength and metallurgical continuity across the joint. The tapered hub geometry enables a gradual transition of stress from the flange to the pipe wall, thereby reducing stress concentrations and enhancing fatigue resistance, particularly under cyclic loading, elevated temperatures, and high-pressure service conditions.


Weld neck flanges are predominantly employed in critical service applications across industries such as petrochemical processing, oil and gas transportation, offshore and subsea systems, and thermal and nuclear power generation. These flanges are manufactured in accordance with international standards such as ASME B16.5, B16.47, and EN 1092, and are available in a wide range of pressure classes and facing types. Material selection—including carbon steels, austenitic and duplex stainless steels, and high-performance alloy steels—is determined based on application-specific requirements such as corrosion resistance, temperature tolerance, and mechanical performance under design conditions.

Product Dimensions
DN Pipe OD Connection Size Flange Thickness (mm) C Flange ID
10 17.2 14 90 60 14
15 21.3 18 95 65 14
20 26.9 25 105 75 16
25 33.7 32 115 85 16
32 42.4 38 140 100 18
40 48.3 45 150 110 18
50 60.3 57 165 125 19
65 76.1 76 185 145 20
80 88.9 89 200 160 20
100 114.3 108 220 180 22
125 139.7 133 250 210 22
150 168.3 159 285 240 24
200 219.1 219 340 295 24
250 273 273 395 350 26
300 323.9 325 445 400 26
350 355.6 377 505 460 28
400 406.4 426 565 515 32
450 457 480 615 565 36
500 508 530 670 620 38
600 610 630 780 725 42
Product Images
304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500 304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500

304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500

Frequently Asked Questions
What is the delivery time?
1-7 days for small orders. 10-20 days for large orders.
What products and services do you supply?
We supply various metal raw materials and products, including pipes, pipe fittings, flanges, coils, sheets, round bars, and more.
How is the product quality ensured?
Quality is our priority. Every product undergoes thorough assembly and testing before packaging and shipment.
What is your minimum order quantity?
MOQ varies by product. Please refer to the product details page or contact us with specific inquiries.
What is your production lead time?
Typically 5-10 days for in-stock items. For custom orders, production takes 15-20 days depending on quantity.

Product Tags:

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304 Stainless Steel Weld Neck Flange 1/2" to 24" Class150-2500 Images

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