Steel Pipe Flange
Product Overview
A Steel Pipe Flange is a forged or cast ring component used to connect pipe sections, valves, and equipment in pressure-rated piping systems, providing a sealed joint for fluid containment.
Technical Specifications
|
Category |
Technical Parameter |
Specification |
|
Standard & Type |
Standard |
ASME B16.5 |
|
Flange Type |
Welding Neck (WN) |
|
|
Facing Type |
Raised Face (RF) |
|
|
Core Rating |
Nominal Pipe Size (NPS) |
2" (DN50) |
|
Pressure Class |
Class 300# |
|
|
Material Grade |
ASTM A105 (Forged Carbon Steel) |
|
|
Structural Dimensions |
Outside Diameter (O.D.) |
165.0 mm |
|
Total Thickness (C) |
22.3 mm |
|
|
Raised Face Diameter (R) |
92.1 mm |
|
|
Raised Face Height |
1.6 mm |
|
|
Hub Diameter at Base (X) |
84.0 mm |
|
|
Hub Diameter at Welding End (A) |
60.3 mm |
|
|
Bore Diameter (B) |
52.5 mm (Sch 40 matching) |
|
|
Length Through Hub (Y) |
69.8 mm |
|
|
Drilling & Bolting |
Bolt Circle Diameter (BCD) |
127.0 mm |
|
Number of Bolt Holes |
8 pcs |
|
|
Bolt Hole Diameter |
19.0 mm |
|
|
Bolt Size |
5/8" |
|
|
Surface Finish |
Flange Face Finish |
Ra 3.2 – 6.3 μm |
Quality Control & Certifications
Quality Control
Dimensional Verification: Laser calipers are used to confirm flange thickness and BCD dimensions meet ASME B16.5 tolerance limits.
Ultrasonic Flaw Detection: UT inspection is applied to detect internal defects and remove parts with subsurface voids before pressure service.
Material Chemical Analysis: PMI testing confirms carbon equivalent below 0.47% to ensure weldability and structural stability.
Mechanical Hardness Testing: Brinell hardness remains consistently between 137–187 HBW for long-term wear and stress resistance.
Surface Roughness Measurement: Mitutoyo profilometers verify the 3.2–6.3 μm Ra finish for gasket seating.
Hydrostatic Pressure Validation: Sample pressure tests up to 1.5 times the rated class verify pressure retention compliance.
Compliance & Certifications
|
Certificate / Regulation |
Evidentiary Validity for Steel Pipe Flange |
|
ISO 9001:2015 |
Quality system with full traceability across production. |
|
PED 2014/68/EU |
EU pressure equipment market approval. |
|
CRN Registration |
Canadian pressure piping compliance approval. |
|
EN 10204 (Type 3.1 / 3.2) |
Traceable material test reports (MTRs) per shipment. |
|
Lloyd's / TÜV Audit |
Third-party manufacturing compliance verification. |
Manufacturing Capabilities
Forging Workshop
8,000-ton and 4,000-ton hydraulic presses and ring rolling mills are used to control material grain flow during forming.
CNC Machining Shop
Multi-axis CNC vertical turret lathes and gantry machining centers execute specified geometric tolerances.
Heat Treatment Facility
Programmable furnaces and quenching tanks operate under closed-loop temperature control during heat treatment cycles.
Custom Engineering & OEM
Blueprint Customization: Client DWG or PDF drawings are converted into machining instructions for production.
Rapid Drawing Turnaround: Engineering teams provide drawing confirmation within 24 hours.
Specialized Surface Coatings: Finishing lines apply anti-rust black paint, protective yellow coating, or hot-dip galvanizing options.
Tailored Boring Profiles: CNC machining accommodates bespoke hub tapers and inner weld bevels matching non-standard pipe schedules.
Alternative Facing Configurations: Engineering teams program non-standard tongue-and-groove or ring-joint profiles per customer technical specifications.
Industrial Applications
|
Application Sector |
Typical Use |
Operational Benefits |
|
Oil & Gas Pipelines |
Connects high-pressure transmission lines and isolation valves. |
Mitigates leakage risk under cyclic pressure and piping stress. |
|
Chemical Processing |
Joins reactors with corrosion-resistant piping systems. |
Material stability under chemical exposure and elevated temperatures. |
|
Power Generation |
Connects high-pressure steam lines to turbine inlet systems. |
Maintains sealing integrity under thermal expansion cycles. |
|
Water Treatment |
Used in municipal water mains and pumping/piping stations. |
Ensures stable sealing under continuous high-flow conditions. |
|
Marine & Offshore |
Connects ballast systems and offshore process piping modules. |
Performs reliably in corrosive saltwater and wave-induced vibration. |
Packaging & Logistics
Plywood Case Enclosures
ISPM-15 certified plywood crates are used to reduce mechanical damage during sea transport.
Flange Face Protectors
Plastic or heavy cardboard discs bolt onto sealing faces to shield machined surfaces.
VCI Barrier Film
Volatile Corrosion Inhibitor plastic wrapping seals components to inhibit oxidation during oceanic shipping.
Port-Agnostic Containerization
Logistical teams secure pallets for standard 20-foot or 40-foot ocean freight container loading.
FAQ
Q: Do you accept mixed-material orders for carbon and stainless steel production runs?
A: Yes, separate production bays manage carbon and stainless steel lines to prevent cross-contamination during manufacturing.
Q: Can you machine custom bolt holes if our existing valves have non-standard alignments?
A: Yes, our multi-spindle drilling rigs can be reprogrammed to match custom pitch circle diameters per client dimensions.
Q: How do you protect the machined sealing faces from rusting during prolonged outdoor storage?
A: We apply specialized rust-preventative oil or peelable plastic coatings to shield machined surfaces prior to packaging.
Q: Are your forging dies managed in-house, or do you outsource tool modification?
A: Our facility maintains an in-house tooling workshop for designing, machining, and maintaining forging dies.
Q: Can you provide European standard EN 10204 Type 3.2 certificates via independent inspectors?
A: Yes, we regularly coordinate with third-party inspectors like SGS or BV to witness testing for 3.2 certification.
Q: What is the typical lead time for a standard container order of these components?
A: Production usually spans 30 to 45 days, depending on material availability and current forging shop scheduling.
Q: Do you accommodate specific marking requests, such as adding internal part numbers to the rim?
A: Yes, our automated laser etching systems can include custom part numbers alongside standard code requirements.
Q: Can your logistical team handle bulk break-bulk shipping for orders exceeding standard container weight limits?
A: Yes, we arrange reinforced crating suitable for break-bulk cargo handling on specialized industrial transit vessels.
Q: What raw material origin options are available for the steel billets used in production?
A: We source raw steel from approved domestic or international mills, depending on project-specific procurement restrictions.
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