Stainless Steel Weld Neck Flange
Product Overview
A Stainless Steel Weld Neck Flange is a pipe connection component with a tapered hub welded to pipe ends for stress distribution in pressure piping systems.
Technical Specifications
|
Parameter |
Specification |
Remarks |
|
Standard |
ASME B16.5 |
NPS 1/2–24 pipe flanges |
|
Material Standard |
ASTM A182 / A182M |
Forged stainless steel |
|
NPS |
2" |
DN 50 equivalent |
|
Pressure Class |
Class 300 |
Medium-pressure service |
|
Material Grade |
ASTM A182 F316L |
Low-carbon stainless steel |
|
Chemical Composition |
C ≤ 0.03%, Cr 16–18%, Ni 10–14%, Mo 2–3% |
Corrosion resistant |
|
Facing Type |
RF (Raised Face) |
RF height 2 mm (0.06") |
|
Facing Finish |
125–250 AARH (Ra 3.2–6.3 μm) |
Serrated finish |
|
Outside Diameter |
6.50" (165.1 mm) |
|
|
Flange Thickness |
0.88" (22.4 mm) |
Excluding RF |
|
Hub Base Diameter |
3.31" (84.1 mm) |
|
|
Weld Neck OD |
2.38" (60.3 mm) |
Matches pipe OD |
|
Bore Diameter |
2.07" (52.5 mm) |
Sch 40S compatible |
|
Hub Length |
2.75" (69.9 mm) |
Face to weld end |
|
Bolt Circle Diameter |
5.00" (127.0 mm) |
|
|
Bolt Holes |
8 holes |
Evenly spaced |
|
Bolt Hole Diameter |
0.75" (19.1 mm) |
For 5/8" bolts |
|
Bolt Hole Eccentricity |
0.03" max (0.8 mm) |
Alignment control |
|
Welding Bevel |
37.5° ± 2.5°, 0.06" land |
Per ASME B16.25 |
Quality Assurance & Inspection
Raw Material Verification
Every batch undergoes 100% PMI testing to verify Cr-Ni composition.
01
Ultrasonic Flaw Detection
100% UT inspection checks internal defects in the weld neck area.
02
Dimensional Tolerance Control
CNC machining controls wall thickness and bevel angle deviation within 0.5mm.
03
Mechanical Property Testing
Tensile and impact tests confirm yield strength for pressure piping use.
04
Surface Integrity Inspection
Liquid penetrant testing inspects sealing face for surface cracks.
05
Traceability & Certification
|
Certificate / Standard |
Verification & Compliance Value |
|
ISO 9001:2015 |
Audited quality management system |
|
PED 2014/68/EU |
EU pressure equipment compliance |
|
AD 2000-Merkblatt |
German pressure vessel safety compliance |
|
CRN (Canada) |
Approved for Canadian pressure installations |
|
EN 10204 3.1 |
Material test report with traceability |
Typical Applications
|
Application Area |
How It Was Used |
Benefits |
|
Chemical processing |
Used in corrosion-resistant pipeline connections |
Prevents leakage risk in aggressive media |
|
Oil & gas systems |
Joins high-pressure process lines |
Supports pipeline maintenance and replacement work |
|
Water treatment plants |
Connects filtration and pump lines |
Used in chloride-containing water systems |
|
Food & beverage |
Links sanitary fluid pipelines |
Used in sanitary fluid transfer lines |
|
Power generation |
Connects auxiliary water lines |
Used in thermal cycling auxiliary pipelines |
|
Marine engineering |
Joins seawater piping systems |
Used in seawater piping systems offshore |
Packaging & Logistics Control
Facing Protection Heavy-duty plastic protectors protect raised faces from surface damage during transit and handling.
Rust-Preventative Coating Exposed machining surfaces receive a light film of volatile corrosion inhibitor oil before crating.
Wooden Crate Cushioning Flanges are separated by plywood dividers inside reinforced sea-worthy boxes to reduce metal contact during transport.
Weld Bevel Safeguard Tapered welding ends are bound with dense foam wraps to avoid structural edge deformation.
Logistics Shock Monitoring Export consignments utilize impact indicator labels on outer packaging to detect rough transit handling.
FAQ
Q: How does the factory ensure internal defect-free quality for these heavy forged hubs?
A: 100% of the forgings undergo ultrasonic testing (UT) according to ASTM A388 to identify internal cracks or porosity.
Q: What heat treatment process is applied to recover corrosion resistance after the forging process?
A: The forgings undergo full solution annealing at minimum 1040°C followed by rapid water quenching for carbide dissolution.
Q: Can your factory provide standard positive material identification for chemical verification prior to shipment?
A: Handheld PMI testing is performed on every batch, and results are recorded in the EN 10204 3.1 MTC.
Q: How do you verify that the hub-to-pipe weld preparation angle is correct for automatic welding?
A: The workshop uses contour gauges and digital goniometers to inspect every machined bevel angle prior to final inspection.
Q: Is raw material sourcing traceable back to the original steel ingot or billet melt?
A: Yes, heat numbers stamped on each flange link directly to the mill test certificate (MTC) data.
Q: What measures prevent intergranular corrosion on the unmachined outer surface of the hub?
A: Solution annealing eliminates chromium carbide precipitation, and pickling passivation recreates a protective chromium oxide passive film layer.
Q: Can the factory accommodate custom wall thicknesses to match special high-pressure piping schedules?
A: CNC machining centers customize the bore ID and hub taper based on your specified matching pipe wall profile.
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