Astm A105N Carbon Steel Welding Plate Flange

Astm A105N Carbon Steel Welding Plate Flange

Core Features

  • Normalized Metallurgical Excellence (A105N): Forged from carbon steel that has undergone a specialized normalization heat treatment. This process refines the internal grain structure, significantly upgrading its impact toughness and ductility in low-temperature environments compared to standard non-normalized A105 steel.
  • Forged Structural Density: Hot-forged under strict temperature controls to eliminate the casting porosities, internal air pockets, and micro-voids common in low-tier alternatives. This provides an exceptionally high burst-pressure threshold under continuous operation.
  • Space-Saving Hubless Geometry: Features a completely flat, collarless plate profile that slides directly over the end of the pipe or tube, allowing for high structural efficiency in tight layout configurations.
  • Double Fillet Weld Attachment: Designed to be secured using both internal and external fillet welds, creating a robust, leak-proof mechanical joint that evenly distributes structural strain and helps absorb systemic pipeline vibrations.
  • Precision CNC Sealing Face: The flat mating face is precision-turned on multi-axis CNC machines to achieve parallel joint alignment and uniform gasket compression, preventing fluid bypass or torque loss over time.

At Kriloha Gaskets & Hardware, we recognize that an industrial pipeline is only as reliable as its bolted connections. Our ASTM A105N Normalized Forged Plate Flanges represent our engineered answer for “Enhanced-Toughness-Security” and “Zero-Flexing-Integrity.” As a premier manufacturer and supplier of high-performance flow control and pipeline elements, Kriloha utilizes automated fabrication lines to deliver drop-in, hubless plate rings that align perfectly with your pipeline blueprints.

The engineering of our A105N plate flange program is founded on Normalized Microstructural Uniformity and Geometric-Perfection. By enforcing a post-forging thermal normalization cycle (heating the steel above its critical transformation range followed by cooling in still air), we eliminate residual casting or forging stresses. The refined metal grain structure smoothly traces the flat geometry of the plate ring, providing the structural modulus required to withstand high bolt-torque demands across the bolt circle without bowing or warping. At Kriloha, we precision-machine the flat sealing surface—standardized to international standards—and finish them with controlled phonographic serrations that mechanically grip the gasket matrix to resist blowout under sudden system pressure spikes.

Manufacturing and provisioning these critical high-grade components involves strict Charpy V-Notch Impact Testing, Ultrasonic Flaw Detection, and Surface Roughness ($R_a$) Calibration. We collaborate directly with your project engineering and facility maintenance teams to supply precise internal bores tailored to standard pipe outer diameters and unique wall-thickness schedules (such as Schedule 40 or Schedule 80 matching). By choosing Kriloha Gaskets & Hardware, you are investing in a “Future-Proof” industrial partnership that prioritizes your system’s lifetime reliability through superior normalized metallurgy and micro-tolerance engineering.

Primary Use Cases

  • Moderate to High-Pressure Plant Utilities: Ideal for main utility lines distributing high-pressure industrial water, factory compressed air loops, and low-pressure fuel gas networks.
  • Boiler Feed & Condensate Networks: Reliable connection joints for steam utility pipelines and thermal fluid transport lines exposed to elevated thermal cycles.
  • Oil, Gas & Petroleum Pipelines: Heavy-duty, economical connection joints for non-corrosive hydrocarbon transport, fuel oil lines, and lubrication oil networks.
  • Water Treatment & Pumping Infrastructure: Standard piping interfaces for high-head municipal water filtration networks, heavy drainage manifolds, and pump stations.
  • Modular Industrial Process Skids: Compact structural flanges used to join prefabricated piping manifolds to flat-faced valves, strainers, and storage tanks.

Frequently Asked Questions (FAQs)

What is the difference between ASTM A105 and ASTM A105N?

The letter “N” indicates that the carbon steel has undergone a post-forging Normalization heat treatment. While standard A105 is used for standard ambient-temperature utilities, normalizing refines the grain size of the steel, giving A105N vastly superior fracture toughness and impact strength, especially in cold weather or fluctuating thermal environments.

Why specify a hubless “Plate Flange” instead of a traditional hubbed Slip-On flange?

Because a plate flange completely lacks a raised collar or hub, it uses less raw material, making it significantly more compact, lightweight, and cost-effective. It provides a flat, space-saving profile that fits into tight spatial envelopes where bulkier hubbed flanges cannot be physically bolted.

What specific welding configuration is required to install an A105N plate flange?

A plate welding flange requires a standard double fillet weld setup for proper installation: one robust fillet weld around the rear side where the plate meets the outer diameter of the pipe wall, and a secondary fillet weld along the inside bore face where the pipe end sits flush with the flange face.

How is this carbon steel flange protected against environmental rust during transit and storage?

Because carbon steel is vulnerable to atmospheric oxidation, our A105N flanges come standard with a protective surface treatment. This typically includes a light black or yellow anti-rust lacquer, a rust-preventative oil finish, or electro-galvanization depending on your long-term storage and installation environment requirements.

Are Material Test Reports (MTRs) provided with these flanges?

At Kriloha Ltd., quality assurance is completely non-negotiable. Every shipment from our facility can be accompanied by comprehensive Material Test Reports (MTRs) confirming exact chemical compositions (Carbon, Manganese, Silicon content), heat treatment logs confirming normalization, hardness values, yield/tensile strength data, and explicit compliance with international industrial standards (such as ANSI/ASME B16.5 or EN 1092-1 dimensional templates).

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