Carbon Steel Weld Neck Flange
Product Overview
A Carbon Steel Weld Neck Flange is butt-welded to the pipe, designed to transfer stress into the pipeline and reduce stress concentration at the flange base area.
Technical Specifications
|
Category |
Parameter |
Specification |
|
Design & Standard |
Design Standard |
ASME B16.5 |
|
Size |
NPS 4 (DN100) |
|
|
Pressure Class |
Class 300 |
|
|
Pipe Schedule |
SCH 40 (6.02 mm) |
|
|
Material |
Material Grade |
ASTM A105 |
|
Manufacturing Process |
Forged (Die Forging) |
|
|
Tensile Strength |
≥ 485 MPa |
|
|
Dimensions |
Outside Diameter |
254.0 mm |
|
Thickness |
31.8 mm |
|
|
Hub Base Diameter |
146.0 mm |
|
|
Welding End Diameter |
114.3 mm |
|
|
Hub Height |
85.7 mm |
|
|
Bore Diameter |
102.3 mm |
|
|
Facing |
Facing Type |
Raised Face (RF) |
|
Raised Face Diameter |
157.2 mm |
|
|
Surface Finish |
Ra 3.2–6.3 µm |
|
|
Bolting |
Bolt Holes |
8 holes |
|
Bolt Hole Diameter |
22.2 mm |
|
|
Bolt Circle (PCD) |
200.0 mm |
|
|
Coating & Certification |
Coating |
Anti-rust oil / Black paint |
|
Certification |
EN 10204 3.1 MTC |
Material & Manufacturing Traceability
Heat Number Stamping: Unique heat numbers are permanently die-stamped on every flange rim for traceability.
MTC Linkage: Every component connects directly to an EN 10204 3.1 Mill Test Certificate.
Forging Log Tracking: Inspection logs record precise heating temperatures and press pressures for every forging lot.
Ladle Analysis Recording: Chemical compositions are recorded and strictly traceable to the original steel mill.
Dimensional Inspection Reports: Final micrometric measurements register under designated batch codes prior to protective coating.
Quality Control & Testing Standards
0.02% Carbon Tolerance
Chemical analysis controls carbon variation, supporting stable weldability and joint performance.
Charpy V-Notch Verification
Impact testing at -46°C evaluates material toughness under low-temperature conditions and fracture resistance.
Hub-to-Flange UT Inspection
Ultrasonic testing at transition zones is used to check internal soundness for high-pressure service conditions.
0.1 mm CMM Accuracy
Coordinate measuring machines are used to verify bolt-hole alignment within specified tolerances for installation fit-up.
Ra 3.2–6.3 μm Facing Control
Precision machining controls surface roughness to support gasket seating performance.
100% Brinell Hardness Mapping
Hardness testing across the tapered neck is performed to check yield strength distribution consistency.
Factory Capability & Certifications
|
Certification / Standard |
Compliance Description |
|
ISO 9001 |
Quality management system certification |
|
PED 2014/68/EU |
EU pressure equipment compliance |
|
API 6H / API 6A |
Oil & gas industry standard compliance |
|
ISO 14001 |
Environmental management system certification |
|
ISO 45001 |
Occupational health & safety system certification |
|
ABS / DNV Type Approval |
Marine and offshore approval certification |
Industrial Applications
|
Application Field |
Typical Use |
Key Benefit |
|
Petrochemical Refining |
Welded to high-pressure cracking lines |
Used in systems with thermal cycling and operating load variation |
|
Offshore Oil & Gas |
Connected to subsea riser manifolds |
Applicable in marine environments with cyclic loading conditions |
|
Power Generation |
Integrated into high-temperature steam piping systems |
Reduces joint deformation at elevated temperatures |
|
Chemical Processing |
Installed on hazardous fluid transport pipelines |
Improves long-term sealing reliability |
|
Cross-Country Pipelines |
Used at pump stations and high-stress connection points |
Ensures stable load transfer across pipeline segments |
Anti-Corrosion & Packaging Integrity
VCI Film Wrapping
Volatile corrosion inhibitor films cover machined parts, preventing rust during sea transit.
01
Plywood Crating
Steel-banded wooden cases protect flanges from impact and shifting during freight handling.
02
Desiccant Pack Integration
Silica gel packets inside airtight linings manage internal moisture levels within humid holds.
03
Coating Curing
Applied protective coatings are fully cured prior to stacking and container loading.
04
Isolating Wooden Runners
Hardwood structural dividers separate individual layers, eliminating metal-to-metal friction and abrasion.
05
FAQ
Q: Can your Carbon Steel Weld Neck Flange match custom pipe wall thicknesses not listed in standard charts?
A: Yes, the internal bore and bevel configurations are regularly machined to match unique, customer-specified pipe schedule profiles.
Q: What heat treatment options are available for low-temperature carbon steel variants?
A: For materials like ASTM A350 LF2, the factory provides normalized or quenched and tempered processing to ensure toughness.
Q: How do you verify the raw forging ratio before machining?
A: Production records document a minimum 4:1 forging reduction ratio from ingot to billet, ensuring unified grain refinement.
Q: Do you offer third-party witness testing for material verification?
A: We regularly accommodate inspectors from agencies like SGS, BV, or TÜV for dimensional and metallurgical witness checks.
Q: How are weld bevels protected without causing field welding issues?
A: Bevels are coated with weldable primer or light oil, allowing simplified pre-weld cleaning procedures.
Q: Can you supply raw material source verification from specific approved steel mills?
A: Yes, origin certificates and original mill heat logs from approved steel suppliers accompany every shipment batch.
Q: Can you meet specific carbon equivalent (CE) limits for sour service?
A: Yes, ladle reports provide CE value documentation (typically below 0.43%) according to client engineering requirements.
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