Stainless Steel Socket Weld Flange

 

Stainless steel socket weld flanges are used for socket welding connections in high-pressure, corrosion-resistant pipelines. They are characterized by high sealing and high strength and are suitable for petroleum, chemical, and steam systems.

 

 

Enhanced Sealing Reliability

The socket welding structure reduces stress concentration and ensures more uniform stress distribution in the weld, resulting in a lower leakage rate under high pressure compared to butt welding.

 

Strong Corrosion Resistance

304/316 stainless steel contains ≥18% chromium and ≥8% nickel, forming a passivation film on the surface that provides long-term resistance to acids, alkalis, and salts, extending its lifespan by 2–3 times compared to carbon steel.

 

High Machining Precision

CNC machining ensures that the surface finish and hole position deviation are controlled within ±0.1mm.

 

 

Sizes: 1/2"–4", Class 150–900

 

Materials: 304, 316, 316L, 321, 904L

 

Connection: Socket Weld, socket depth customizable

 

Surface Finish: Natural, pickled, passivated, rust-preventive oil

 

Packaging: Plastic bag + inner carton + wooden crate/pallet

 

 

Rust and Moisture Prevention: Products are first treated for moisture protection and then individually wrapped in plastic bags.

 

Compression-Resistant Packaging Structure: The inner box is divided into compartments, and the outer box is a five-layer corrugated cardboard box.

 

Stable Load-Bearing Capacity: Large items or bulk shipments are secured with wooden pallets and steel straps to prevent damage and tipping during long-distance transportation.

 

Transportation Methods: Sea freight, air freight, and express delivery are supported.

 

 

15+ years of experience in stainless steel flange manufacturing, with an annual production capacity exceeding 3000 tons.

 

In-house forging and CNC machining throughout the entire process, ensuring consistent and controllable dimensional accuracy and sealing surface quality.

 

Production is carried out according to ASME B16.11 / B16.5 standards, with 100% material, dimensional, and pressure testing.

 

Large inventory of standard specifications; bulk orders delivered in 7–15 days.

 

 

Project	Details/Specification range
Commonly used materials	Austenitic stainless steels: 304, 304L, 316, 316L, 321, 316Ti, 347H, 310S (SUS310S), 904L, etc Duplex stainless steels: 2205 (S31803), 2507 (S32750, etc Nickel-based alloys: UNS N08810/N08811 (Incoloy 800/800H), UNS N06625 (Inconel 625), UNS N10276 (Hastelloy C276), etc
Nominal diameter (DN)	Standard range: DN15 - DN50 (1/2 "- 2") Special Custom: Extended to DN10 (3/8 ") and limited range larger than DN50 (subject to condition assessment)
Pressure rating	PN Series: PN1.0, PN1.6, PN2.5, PN4.0, PN6.3, PN10.0 MPaClass Series: Class 150, Class 300, Class 600, Class 900, Class 1500(Higher pressures such as Class 2500 are customizable)
Sealing surface type	Raised face (RF) : Most commonly used concave-convex face (MFM) : Needs to be used in combination, better sealing performance tenon groove face (TG) : Needs to be used in combination, suitable for extremely hazardous media ring connection face (RJ) : used in high pressure and high temperature conditions Full plane (FF) : mainly used for low-pressure gaskets to cover the entire flange face
enforce standards	National standard (GB) : GB/T 9117-2010 (Steel pipe flange with neck socket welding) Ministry of Chemical Industry standard (HG) : HG/T 20592-2009 (European System) American Standard (ASME) : ANSI B16.5 German standard (DIN) : DIN standard (e.g. DIN2633) Japanese standard (JIS) : JIS B 2220 British standard (BS) : BS 4504 International standard (ISO) : ISO 7005-1 (supporting processing according to drawings, meeting various special standard requirements)
Manufacturing process	Main process: Integral forging (die forging/free forging) to ensure material density and mechanical properties Finishing: High-precision CNC lathe turning, CNC swing drilling to ensure dimensional accuracy and sealing surface finish Welding: Precision welding processes such as TIG welding (for double-sided welding options)
Connection method	One end: Socket welded to the steel pipe Other end: Bolted to the matching flange (with gasket)

 

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