Stainless 316L Weld-Neck & Slip-On Flanges

What is 316L Weld-Neck and Slip-On Flanges?
316L weld-neck flanges are best for high-pressure, high-temperature systems due to their strong, tapered neck that is welded directly to the pipe, while 316L slip-on flanges are a lower-cost option for low-to-medium pressure applications, sliding over the pipe and welded both inside and out. The "316L" designation means they are made of low-carbon stainless steel, offering enhanced corrosion resistance compared to other grades.

 

GNEE supplies Stainless 316L Weld-Neck (butt-weld flanges) & Slip-On (socket-weld flanges), which are formed through forging or casting processes and treated with solution annealing + acid pickling. These flanges are suitable for pipeline systems in industries such as petrochemicals, marine engineering, food processing, and pharmaceuticals, providing reliable connections between pipes and valves, pumps, or other equipment.

​​Flange Types:​​

​​Weld-Neck Flanges:​​ The neck is welded to the pipe, ensuring even stress distribution and excellent resistance to fatigue and thermal cracking, making them suitable for high-temperature, high-pressure, and severe cyclic load environments.

​​Slip-On Flanges:​​ Installed by directly slipping over the pipe and welding on both sides (double welding), offering easy installation and lower costs, ideal for medium and low-pressure standard conditions.

​​Specifications:​​

​​Nominal Diameter (DN):​​ 15–600 mm (1/2"–24") (custom larger sizes available)

​​Pressure Ratings:​​ Class 150–2500 (PN10–PN420)

​​Surface Treatment:​​ Standard supply features acid pickled annealed finish (No.1/2B, uniform silver-gray); optional mirror polishing (Ra≤0.4μm) or electropolishing (Ra≤0.2μm) for high cleanliness requirements in food/pharmaceutical industries.

 

 

Specifications of 316L Stainless Steel Flanges

Parameter	Weld-Neck Flange	Slip-On Flange
Standard	ANSI B16.5, ASTM A182	ANSI B16.5, ASTM A182
Grade	316L (UNS S31603)	316L (UNS S31603)
Size Range	1/2" to 24" (DN 15 to DN 600)	1/2" to 24" (DN 15 to DN 600)
Pressure Class	150#, 300#, 600#	150#, 300#, 600#
Material	Stainless Steel 316L	Stainless Steel 316L
Face Type	Raised Face, Flat Face	Raised Face, Flat Face

 

Latest Price Update for 316L Stainless Steel Flanges (October 2025)

Product Type	Size	Pressure Rating	Price (USD/piece)
316L Weld-Neck Flange	2" (DN 50)	150#	$35.00 – $40.00
316L Weld-Neck Flange	6" (DN 150)	300#	$70.00 – $85.00
316L Slip-On Flange	2" (DN 50)	150#	$30.00 – $35.00
316L Slip-On Flange	6" (DN 150)	300#	$60.00 – $75.00

💡 Note: Prices are subject to market fluctuations, especially nickel and chromium prices. Contact Gnee for bulk discounts or long-term contract pricing.

 

Applications of 316L Stainless Steel Flanges

316L Stainless Steel Weld-Neck Flanges	316L Stainless Steel Slip-On Flanges
High-pressure systems (chemical processing, steam piping)	Low-pressure systems (HVAC, general piping)
Marine vessels and offshore platforms	Low-cost plumbing systems
Pressure vessels and heat exchangers	Food and beverage industries
Oil & gas pipeline systems	Water treatment facilities
Nuclear power plants	Automotive exhaust systems

 

Packaging & Logistics

Packaging: Moisture-proof and shock-resistant packaging for all flanges.

Lead Time: Typically 7–15 days after order confirmation.

Payment Terms: T/T, L/C, PayPal, or flexible terms for long-term clients.

Minimum Order Quantity: 10 pieces for standard orders; bulk order discounts available.