Our ANSI Stainless Steel Flanges are strictly manufactured in accordance with ASME B16.5 and ASME B16.47 standards. Designed for high-performance sealing connections across oil & gas, chemical processing, power generation, desalination, and marine engineering, they ensure zero-leakage operation under critical temperature and high-pressure conditions.
Technical Specifications
Parameter
Standard Configuration & Capabilities
Manufacturing Standards
ASME B16.5 (1/2"–24"), ASME B16.47 Series A & B (26"–80"), MSS SP-44
100% Heat Traceability: Every flange is stamped with a unique Heat Number and batch code. All shipments are supplied with standard EN 10204 3.1 Material Test Reports (MTRs) detailing exact chemical compositions and mechanical properties.
Rigorous In-House Testing: Equipped with an on-site laboratory featuring PMI (Positive Material Identification) Spectrometers for 100% grade verification (zero mixing risk). Non-Destructive Testing (NDT) such as UT (Ultrasonic) and PT (Penetrant) are available to ensure zero internal forging defects.
Global Certifications & TPI: Our facility is certified under ISO 9001:2015 and PED 2014/68/EU. We welcome and fully cooperate with international Third-Party Inspection (TPI) agencies including SGS, TÜV, BV, DNV, and Intertek.
Ready Stock & Sea-Worthy Logistics
7-Day Fast Shipping: We maintain an extensive raw forging and finished stock for standard specifications (1/2" to 24", Class 150/300, RF, F304L/F316L) to support Low MOQ orders and quick inventory turnarounds.
Heavy-Duty Maritime Packaging:
Facing Protection: Sealing faces (RF/RTJ) are fitted with heavy-duty plastic caps to eliminate transit scratches.
Anti-Corrosion: Cleaned and treated with anti-rust oil or sealed in VCI (Volatile Corrosion Inhibitor) film to block humid sea air.
Outer Packing: Securely packed into export-standard, fumigation-free plywood cases or palletized with heavy shrink-wrap.
OEM / ODM Customization Capabilities
Tailored Engineering: Production of non-standard dimensions, heavy-wall thicknesses, or large diameters up to 80" based on your custom engineering drawings.
Advanced Surface Finishes: Industrial pickling & passivation, shot-blasting, mirror polishing, or electropolishing based on application requirements.
Bespoke Branding: Customized laser marking, specific hard stamping, neutral packaging, or private OEM labeling for global distributors.
Why Partner With Us?
Fully Integrated Manufacturing: From raw steel sourcing, die forging/ring rolling, and heat treatment to precision CNC machining-we control quality and cost at every step.
100% Dimensional Accuracy: Strict compliance with ASME tolerances ensures seamless, drop-in interchangeability with global valve and piping systems.
Approved Project Supplier: Complete compliance documentation makes our products easily approved for major international engineering vendor lists (AVL).
FAQ
Q: Do your stainless steel flanges come with EN 10204 3.1 Certification?
A: Yes, absolutely. 100% of our stainless steel flanges are supplied with standard EN 10204 3.1 Material Test Reports (MTRs). The certificate includes heat numbers, chemical analysis, tensile strength, yield strength, elongation, and hardness test results. If required by your project specification, we can also provide EN 10204 3.2 certification witnessed by third parties like Lloyd's or TÜV.
Q: How do you prevent intergranular corrosion in your F304/F316 stainless steel flanges?
A: We strictly execute full solution annealing heat treatment (typically water quenching at 1040°C-1150°C depending on the specific grade) for all forged blanks. This process ensures all chromium carbides are dissolved back into the austenite matrix, eliminating the risk of sensitization and maximizing the flange's corrosion resistance in severe environments.
Q: What is the difference between ASME B16.47 Series A and Series B flanges for large diameters?
A: We manufacture both types for sizes 26" to 80". Generally, Series A (originally MSS SP-44) flanges are thicker, heavier, and stronger, making them the preferred choice for piping systems and heavy-duty pipeline applications. Series B (originally API 605) flanges are thinner and lighter with more but smaller bolt holes, commonly used in compact spaces or equipment connections to reduce weight and cost.
Q: What are your standard anti-rust and surface protection measures for ocean freight?
A: To withstand long-distance maritime transport, we apply a three-layer protection protocol:
All flanges undergo thorough solvent cleaning and are coated with a light film of high-performance anti-rust oil.
The critical sealing faces (RF or RTJ grooves) are protected by snap-on heavy-duty plastic caps.
Cargo is vacuum-sealed or enclosed using VCI (Volatile Corrosion Inhibitor) bags inside export-grade, fumigation-free plywood crates to prevent salt-spray corrosion.
Q: Can I order a mixed container with different sizes, schedules, and material grades?
A: Yes. We highly support stockists and regional distributors. We accept mixed-item orders with flexible, low MOQs per line item. We can optimize the container loading configuration to mix standard Weld Necks, Slip-Ons, and Blind flanges in grades like F304L, F316L, and Duplex steel to help you reduce your inventory holding costs.
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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