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At Cangzhou Hangxin Flange Co., Limited, quality is not a final inspection step-it is a fully integrated process applied throughout every stage of production. With over 30 years of manufacturing experience, we have established a strict quality control system to ensure that every forged flange and pipe fitting meets international standards and customer engineering requirements.
Our quality management system is certified under ISO 9001 and follows internationally recognized standards, including ASME, DIN, EN, and JIS.
Incoming Raw Material Inspection (IQC)
We only partner with top-tier, verified steel mills. Every batch of raw steel bar or ingot must undergo:
MTC Verification: Verifying the steel mill's original Mill Test Certificate against project requirements.
Chemical Composition Analysis: Utilizing a desktop spectrometer to re-verify elements (C, Mn, Si, P, S, Cr, Ni, Mo) to prevent material mixing.
Visual & Dimensional Check: Inspecting raw material surface defects, cracks, and diameter tolerances.
In-Process Quality Control (IPQC)
During the forging and machining process, our QC inspectors perform real-time checks:
Forging Temperature Control: Monitoring heating and forging temperatures to ensure optimum metal grain refinement and structural integrity.
First-Article Inspection (FAI): The first flange of every CNC machining batch is fully measured before continuous production begins.
Routing Inspection: Random dimensional sampling by operators and QC engineers every hour during turning and drilling.
Final Inspection & Non-Destructive Testing (FQC)
Before moving to packaging, every single product undergoes a final evaluation:
100% Dimensional Verification: Double-checking inner/outer diameter, thickness, bolt hole circles, raised face height, and tolerances using calibrated vernier calipers and micrometers.
Surface Roughness Inspection: Ensuring the gasket contact surface finishes meet ASME B16.5 requirements (e.g., 125-250 AARH serrated finish).
Non-Destructive Testing (NDT): Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) are executed based on project specifications to detect internal flaws or surface micro-cracks.
Pre-Shipment & Packaging Inspection (OQC)
Anti-Rust Protection: Checking that a proper coat of anti-rust oil, black paint, or yellow varnish is evenly applied.
Stenciling & Marking Check: Verifying that the heat number, size, pressure class, material grade, and standard are clearly and correctly hard-stamped on the flange rim.
Seaworthy Packaging: Ensuring products are securely packed in sturdy plywood cases or on pallets with plastic wrapping to prevent damage and moisture during sea freight.
We implement a full traceability system from raw material to finished product.
Each product can be traced through:
Heat number tracking
Production batch records
Material test certificates (MTC)
Inspection reports
We can provide EN10204 3.1 certificates upon customer request.
To meet international project requirements, we support third-party inspections by globally recognized agencies, including:
SGS
Bureau Veritas (BV)
TÜV Rheinland
Other customer-nominated inspection bodies
To guarantee exact metallurgical and mechanical specifications, our quality department is equipped with a comprehensive suite of testing instruments:
Optical Emission Spectrometer (PMI Testing) - For precise chemical analysis and material grade verification.
Ultrasonic Flaw Detector (UT Machinery) - For identifying internal volumetric defects, slag inclusions, or voids inside the heavy forged body.
Magnetic Particle Testing (MT) Equipment - For detecting surface and near-surface micro-fissures.
Brinell & Rockwell Hardness Testers - For verifying uniform hardness profiles after heat treatment.
Universal Mechanical Testing Machine - For evaluating tensile strength, yield strength, and elongation compliance.
Impact Testing Equipment - For checking low-temperature Charpy V-notch toughness when requested for critical environments.
We have been certified under internationally recognized systems, including:
ISO 9001 Quality Management System Certification
CE Certification (European Conformity Standards)
3A Enterprise Credit Rating Certification
These certifications ensure that our production processes and quality management systems meet strict international requirements.
Based on the years of the technical precipitation and production experience, we provide hundreds of (easy to use, reliable, low price) products for the whole world wide clients and projects.
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admin@yongxingflange.com
+86-18931763322