High-grade carbon, stainless, and alloy plate flanges manufactured strictly to ASME, EN, DIN, and ISO specifications.
How high-precision flame/laser cutting, automated beveling, and advanced metallurgy are redefining low-to-medium pressure piping systems worldwide.
Historically viewed as an alternative to drop-forged flanges, modern steel plate flanges (EN 1092-1 Type 01, Plate/Flat Flanges) offer unmatched structural consistency when processed from hot-rolled structural steel plates. By employing high-definition CNC plasma, laser, and oxy-fuel cutting combined with automatic face machining, manufacturers eliminate internal forging voids and substantially cut material yield loss, passing 15% to 30% cost savings to global buyers without compromising pressure ratings.
As global energy infrastructure expands into LNG regasification, green hydrogen distribution, and biomass processing, the demand for large-diameter steel plate flanges (up to DN3000 / 120 inches) has surged. Plate manufacturing allows for immediate custom sizing, specialized bolt-circle drilling patterns, and non-standard face grooving (such as tongue-and-groove or RTJ gaskets) that standard forged tooling dies cannot accommodate without long lead times.
Modern industrial buyers require verifiable quality assurance. China's leading plate flange mills now operate with fully integrated steel plate traceability. Plates are sourced directly from tier-one steelmakers (e.g., Baosteel, Shougang) with complete ultrasonic testing (UT per ASTM A578 Level II) to ensure zero laminar defects prior to flange blanking and final precision machining.
Understanding user intent and technical necessity in EPC project tendering, MRO stocking, and custom pressure vessel manufacturing.
In high-reliability fluid conveyance systems, leak integrity depends heavily on flange facing finish. Steel plate flanges must conform exactly to standard facing finish metrics depending on gasket application:
Sourcing managers must align raw plate chemistry with operational temperatures, corrosive media, and structural stress thresholds:
| Flange Standard | Common Types | Pressure Rating Range | Size Range | Primary Industrial Intent |
|---|---|---|---|---|
| ASME B16.5 / B16.47 | Plate Slip-On, Plain Flange, Blind Plate | Class 150 to Class 900 | ½" to 60" (DN15 - DN1500) | North American Oil & Gas, Petrochemical, Offshore Piping |
| EN 1092-1 | Type 01 (Flat Plate), Type 02 (Loose Plate) | PN 2.5 to PN 40 | DN10 to DN3000 | European Union Infrastructure, Water Treatment, Power Plants |
| DIN Standards (DIN 2576/2502) | Flat Welding Flange (Flats) | PN 6, PN 10, PN 16 | DN10 to DN2000 | Legacy European Plant Machinery, HVAC, District Heating |
| JIS B2220 | Plate Type (SOP 5K/10K/16K) | 5K, 10K, 16K, 20K | 10A to 1500A | Asian Pacific Shipbuilding, Industrial Hydraulics, Marine Engineering |
Leveraging Shanxi's world-famous steel industrial ecosystem to deliver unprecedented cost-efficiency, rapid prototyping, and end-to-end quality assurance.
Our factory integrates multi-axis CNC vertical turning lathes (VTL) and high-speed multi-spindle drilling centers. Plate blanks cut via fiber laser or high-definition CNC plasma pass directly to automated machining lines, reducing human error, maintaining hole pitch tolerance within ±0.1mm, and boosting daily volume output by over 250%.
Every batch undergoes rigorous quality control using 3D Laser Coordinate Measuring Machines (CMM), Positive Material Identification (PMI) gun spectrometers, Magnetic Particle Inspection (MPI), and Ultrasonic Testing (UT). Batch records are uploaded to our ERP system to guarantee 100% heat number traceability from steel plate billet to packaged flange.
Direct raw material sourcing contracts with Shanxi Baotou Steel and Taiyuan Iron and Steel (TISCO) ensure stable raw material pricing and uninterrupted steel supply during global market fluctuations. Furthermore, our electric furnace heating and clean energy plasma processing align with modern ESG sustainability guidelines.
From municipal water treatment to severe chemical processing, steel plate flanges provide critical joinery across global infrastructure.
In fuel storage tanks, low-pressure hydrocarbon piping, and flare stacks, carbon steel plate flanges (EN 1092-1 Type 01 PN16/PN25) provide rapid assembly and reliable structural seating. Hot-dip galvanizing and black rust-preventive varnish treatments ensure long-term atmospheric corrosion resistance in coastal refinery zones.
Large-diameter water mains require cost-effective, corrosion-resistant flange connections capable of taking dynamic hydraulic expansion. SS316L plate flanges and rubber-lined carbon steel plate flanges are widely deployed across seawater reverse osmosis (SWRO) facilities across the Middle East and Southeast Asia.
Plate flanges and specialized precision-drilled tube sheets form the core structural skeleton of shell-and-tube heat exchangers, industrial boilers, and municipal heating loops. Our factory produces custom-drilled tube sheets up to 80mm plate thickness with micron-level hole pitch tolerances.
In ship ballast systems, bilge piping, and cooling networks, compact plate flanges conforming to JIS B2220 or standard EN 1092-1 offer vital space-saving advantages inside engine rooms while withstanding harsh salt-spray environments.
Threaded, Blind, Ring-Type Joint, and Custom Machined Flanges ready for global container shipping.
Addressing key technical inquiries regarding plate flange manufacturing, pressure limits, material compliance, and international shipping.
A Steel Plate Flange (such as EN 1092-1 Type 01 flat flange or ANSI B16.5 Slip-On plate flange) is machined directly from a flame/laser-cut structural steel plate. It features a flat profile without a high tapered hub and is slipped over the pipe end before fillet welding inside and outside. A Weld Neck Flange possesses a long tapered hub that is butt-welded to the pipe, designed specifically for extreme pressure (Class 600+) and severe thermal cycles. Plate flanges are significantly more economical and compact for low-to-medium pressure utility and transport lines (Class 150/300, PN6-PN40).
We enforce strict raw material quality gates. All heavy steel plates are sourced exclusively from top-tier mills with mandatory EN 10204 3.1 Material Test Certificates (MTC). Prior to CNC cutting, raw plates undergo 100% Ultrasonic Testing (UT per ASTM A578 / EN 10160) to detect internal inclusions, micro-cracks, or lamination defects. Any plate failing defect size thresholds is immediately rejected.
Yes. Custom OEM manufacturing is a core strength. With our in-house CAD/CAM nesting software, fiber laser systems, and VTL machining hubs, we produce non-standard plate flanges, oversized rings, blind flanges with custom tapped ports, and heat exchanger tube sheets up to 3,000 mm (120 inches) in diameter and 120 mm in plate thickness from your PDF, DWG, or STEP files.
To prevent corrosion during long ocean transit and long-term outdoor site storage, we supply multiple surface finishing options: 1. Yellow/Black Rust-Preventive Varnish, 2. Hot-Dip Galvanizing (HDG per ASTM A123 / EN ISO 1461), 3. Electro-Galvanizing (Zinc Plating), and 4. Epoxy or Anti-Corrosion Ceramic Coatings for marine/subsea installations. Flange faces are further protected with plastic caps and oil-impregnated paper.
Every shipment is accompanied by a comprehensive Quality Documentation Package including: EN 10204 3.1 (or 3.2 Third-Party Inspection report by SGS/TÜV/BV on request) detailing chemical composition (ladle analysis), mechanical tensile strength, yield point, elongation, hardness tests, Charpy V-notch impact test values (down to -40°C), NDT reports (UT/MPI), and dimensional inspection compliance sheets.
Whether you are bidding for a major EPC pipeline project, replenishing distributor stock, or sourcing custom tube sheets, our sales engineering team responds within 24 hours with complete price schedules and technical proposals.
