Stainless Steel Threaded Flange
Product Overview
A Stainless Steel Threaded Flange is used for internal-thread, non-welded pipe connections in systems with stable temperature or pressure requirements.
Technical Specifications
|
Category |
Parameter / Property |
Value / Specification |
|
Design & Dimensional Standards |
American Standard |
ASME B16.5 (1/2" to 24") |
|
European Standard |
EN 1092-1 Type 13 (DN15 to DN600) |
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|
Japanese Standard |
JIS B2220 |
|
|
Thread Specifications |
Thread Type (Standard) |
NPT (ASME B1.20.1) |
|
Thread Type (Optional) |
BSPT (Rc) / G (BSPP) / PT |
|
|
Thread Gauge Standard |
ASME B1.20.1 reference gauges |
|
|
Thread Inspection |
100% Go/No-Go plug gauge inspection |
|
|
Material & Manufacturing |
Material Standard |
ASTM A182 / ASME SA182 |
|
Stainless Grades |
F304 / F304L / F316 / F316L / F321 / F51 (Duplex) |
|
|
Heat Treatment |
Solution annealed ≥1040°C + water quenched |
|
|
Pressure Ratings & Sizes |
ASME Pressure Class |
Class 150 / 300 / 600 / 900 |
|
EN Pressure Rating |
PN6 / PN10 / PN16 / PN25 / PN40 / PN63 / PN100 |
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|
Size Range |
1/2" to 24" (DN15 to DN600) |
|
|
Mechanical Properties (F316L) |
Tensile Strength |
≥485 MPa |
|
Yield Strength |
≥170 MPa |
|
|
Elongation |
≥30% |
|
|
Hardness |
≤187 HBW |
|
|
Dimensional Tolerances (ASME B16.5) |
Outside Diameter |
NPS ≤10": ±2.0 mm / ≥12": ±3.0 mm |
|
Inside Diameter |
NPS ≤10": +1.0 / -0 mm / ≥12": +1.5 / -0 mm |
|
|
Thickness |
NPS ≤18": +3.0 / -0 mm / ≥20": +5.0 / -0 mm |
|
|
Counterbore Depth |
NPS ≤10": ±1.0 mm / ≥12": ±1.5 mm |
Engineering & Manufacturing
CNC Threading Process
Internal threads are machined according to NPT or BSPT standards to achieve tight mechanical fit.
Forging Production Process
Hot forging refines grain structure to improve pressure-bearing performance.
Solution Annealing Treatment
Heating and rapid cooling restore corrosion resistance and reduce internal stress.
Dimensional Inspection Protocols
Calipers and thread gauges verify wall thickness, pitch accuracy, and outer diameters.
Compliance & Quality Assurance
Regulatory Standards Compliance
Material Traceability Check: Each flange is stamped with a heat code linked to mill certificates.
Pressure Rating Verification: Dimensions align with ASME B16.5 or EN 1092-1 pressure-temperature ratings.
Chemical Composition Validation: Spectroscopy checks chromium, nickel, and molybdenum content against ASTM standards.
Factory Quality Protocols
Non-Destructive Testing: Liquid penetrant testing checks internal and external surfaces for sub-surface micro-fissures.
Hydrostatic Pressure Checks: Sample batches undergo water pressure testing to confirm structural sealing integrity under load.
Thread Gauge Audits: Go/No-Go plug gauges verify internal thread depth and taper tolerances after machining.
Applications
|
Application Field |
Typical Use |
Benefits |
|
Chemical Processing |
Connecting piping in non-welded hazardous zones |
Reduces ignition risk during installation |
|
Water Treatment |
Joining stainless lines in desalination systems |
Improved resistance to chloride pitting corrosion |
|
Oil & Gas Utilities |
Assembling low-pressure auxiliary pipelines |
Supports easier disassembly during maintenance |
|
Food & Beverage |
Linking sanitary fluid transfer networks |
Minimizes crevice contamination risk at joints |
|
Marine Engineering |
Connecting onboard cooling and fuel piping |
Withstands continuous salt spray exposure |
Supply Chain & Capacity
Raw Material Inventory
Regular stock of certified 304 and 316 forging billets supports stable production scheduling.
Monthly Output Capacity
Production lines output up to 500 metric tons of flanges per month.
Flexible Batch Machining
Adjustable tooling configurations support both high-volume production and low-volume custom runs.
Export Packaging Standards
Flanges receive anti-corrosion oil coatings and plywood crate packing for maritime transit.
FAQ
Q: What surface finishes are available for the sealing face?
A: Flanges are supplied with smooth or stock serrated finishes per ASME standards.
Q: Do you provide material test reports (MTRs) with each shipment?
A: Yes, EN 10204 3.1 mill test certificates are provided for chemical and mechanical data.
Q: How do you protect the internal threads during overseas shipping?
A: Every flange is fitted with a high-density plastic cap to prevent thread impact damage and debris ingress.
Q: Is threading performed before or after the final heat treatment?
A: Threading is done after heat treatment to avoid thermal distortion of pitch and taper.
Q: What is the lead time for custom-dimension hub thicknesses?
A: Custom configurations require a standard lead time of four to six weeks for forging, machining, and verification.
Q: Are the markings stamped or laser-etched onto the flange body?
A: Low-stress die stamping on the outer rim provides permanent legibility without creating stress risers.
Q: What thread sealants do you recommend for high-temperature installations?
A: High-purity nickel-filled PTFE tape or anaerobic compounds can be used to prevent galling during assembly.
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