Astm A105 Plate Dn25 Dn40 Carbon Steel Flange

Astm A105 Plate Dn25 Dn40 Carbon Steel Flange

Core Features

  • ASTM A105 Premium Carbon Steel: Hot-forged from fully killed carbon steel stock designed specifically for ambient- and elevated-temperature service in rugged piping systems and utility lines.
  • Dual Small-Bore Size Availability (DN25 & DN40): Precision-machined to slide seamlessly over standard DN25 (1-Inch Nominal Sizing) or DN40 (1.5-Inch Nominal Sizing) outer diameter industrial conduits and metric tubes.
  • Forged Microstructural Uniformity: Manufactured using controlled hot-forging pathways to ensure a refined, continuous metal grain flow. This eliminates internal voids, porous spots, and gas pockets, delivering an exceptionally high burst-pressure threshold.
  • Hubless, Space-Saving Configuration: Features a completely flat, collarless plate profile that minimizes total structural weight, reduces raw material volume, and fits easily into tight, restricted equipment enclosures.
  • Double Fillet Weld Attachment: Attached via both internal and external fillet welds, creating a highly stable mechanical joint that evenly distributes physical line tension and absorbs systemic machinery vibrations.

At Kriloha Gaskets & Hardware, we recognize that small-bore fluid lines demand the exact same engineering integrity as massive primary headers. Our ASTM A105 DN25 and DN40 Carbon Steel Plate Flanges represent our engineered answer for “Micro-Space-Joint-Security” and “Flawless-Flat-Alignment.” As a premier supplier of high-performance flow control and pipeline elements, Kriloha utilizes automated multi-axis production workflows to ensure that our hubless plate rings provide superior mechanical longevity.

The engineering of our small-bore plate flange program is founded on Metallurgical-Traceability and Geometric-Perfection. Forged from certified raw steel stock rather than lower-grade cast alternatives, our flanges eliminate internal porous defects and structural stress concentrations. The refined metal grain structure smoothly traces the flat profile of the plate ring, providing the structural modulus required to withstand high bolt-torque demands across the bolt circle without bowing, warping, or relaxing under pressure over time. At Kriloha, we precision-machine the flat sealing face on advanced CNC turning centers, finishing them with micro-grooved phonographic serrations that mechanically grip the gasket matrix to resist blowout under sudden system pressure cycles.

Manufacturing and provisioning these critical utility connection pieces involves strict Dimensional Tolerance Checks, Volumetric Material Inspections, and Face Roughness ($R_a$) Calibration. We collaborate directly with original equipment manufacturers (OEMs), structural fabricators, 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 carbon metallurgy and micro-tolerance engineering.

Primary Use Cases

  • Small-Scale Machinery Fluid Loops: Compact connection interfaces for industrial hydraulic packs, localized chemical dosing skids, and lubrication manifolds on processing machinery.
  • Pneumatic & Utility Gas Lines: Low-profile joint connections for secondary factory loops carrying compressed air, nitrogen, or argon directly to automated assembly workstations.
  • Commercial HVAC & Condensate Loops: Cost-efficient, robust connections for commercial building water risers, chilled water networks, and industrial air-handling drainage lines.
  • Water Treatment & Pump Manifolds: Standard space-saving piping interfaces for filtration skid inlets, non-potable water transfer lines, and chemical feed manifolds.
  • Prefabricated Modular Skids: Compact structural flanges used to integrate secondary utility piping networks directly into flat-faced valves, strainers, and storage vessels.

Frequently Asked Questions (FAQs)

What is the fundamental difference between DN25 and DN40 sizing for this plate flange?

DN25 stands for Diameter Nominal 25mm, which corresponds directly to a standard 1-inch Nominal Pipe Size (NPS 1).

DN40 stands for Diameter Nominal 40mm, which corresponds to a 1.5-inch Nominal Pipe Size (NPS 1-1/2).

Each size features a unique bolt-circle pattern, outer diameter, and central bore dimension optimized for its respective pipe size.

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

Because a plate flange completely lacks a raised collar or hub, it uses significantly less raw material during manufacturing. This makes it a highly compact, lightweight, and cost-effective alternative for standard process networks and utility lines where the extra structural reinforcement of a heavy hub is not functionally required.

What specific welding configuration is required to install an A105 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 flat face.

How are these carbon steel plate flanges protected against environmental rust during storage?

Because carbon steel is vulnerable to atmospheric oxidation, our high-quality A105 plate flanges come standard with a protective surface treatment. This typically includes a light yellow or black anti-rust lacquer, a rust-preventative oil finish, or electro-galvanization depending on your long-term storage and field installation environment requirements.

Are Material Test Reports (MTRs) provided with these small-bore 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), hardness values, yield/tensile strength data, and explicit compliance with international dimensional standards (such as ANSI/ASME B16.5 or EN 1092-1) to guarantee complete industrial traceability.

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