Astm A105 3 Inch Flange High Pressure Stainless Steel 304 Slip On Flange

At Kriloha Gaskets & Hardware, we recognize that modern fluid processing networks require balancing strict metallurgical compliance with structural value. Our 3-Inch Forged High-Pressure Slip-On (SO) Raised Face (RF) Flanges represent our engineered answer for “High-Load-Joint-Security” and “Zero-Flexing-Integrity” across essential processing arrays. Sourced from our advanced automated fabrication facilities, Kriloha bridges the gap between raw material science and precise international dimensional standards, ensuring that every slip-on component integrates flawlessly alongside your high-performance sealing gaskets.

The engineering of our 3-inch slip-on program is founded on Microstructural Uniformity and Deflection-Resistant Flatness. By forcing certified steel stock through controlled hot-forging paths rather than relying on lower-cost casting alternatives, we completely eliminate internal gas pockets, casting porosities, and structural micro-cracks. Sourcing our ASTM A105 Carbon Steel program provides uniform hardness and exceptional mechanical toughness under cyclical line stress, while our Stainless Steel 304 program utilizes low-carbon thresholds to prevent intergranular corrosion cracking along the weld line. At Kriloha, we precision-machine the Raised Face (RF) sealing surfaces on advanced CNC turning centers, finishing them with controlled phonographic serrations ( finish) that firmly anchor the gasket matrix to eliminate fluid bypass or blowout risks during sudden system pressure cycles.

Manufacturing and provisioning these critical flow-control connection pieces involves strict Dimensional Tolerance Checks, Volumetric Material Inspections, and Face Roughness Calibration. We collaborate directly with your project engineering, procurement, 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 metallurgy and micro-tolerance engineering.

Primary Industrial Applications

High-Pressure Plant Utilities: Ideal for primary factory utility lines distributing high-pressure industrial water, cooling tower loops, high-pressure compressed air networks, and inert gas loops.
Petrochemical & Refinery Piping Loops: High-reliability joint connections for downstream processing lines handling non-corrosive hydrocarbons, heavy fuel oils, lubricants, and oil-water slops (when specified in carbon steel).
Hygienic Process Pipelines: Clean-utility networks in food processing, beverage bottling lines, dairy plants, and cosmetics manufacturing where smooth, non-porous stainless steel prevents fluid contamination and survives clean-in-place (CIP) steam washdowns (when specified in Grade 304).
Municipal Water & Sewage Infrastructure: High-volume provisioning for large-scale water treatment headers, municipal pump station manifolds, and wastewater filtration networks.
Modular Industrial Process Skids: Compact structural mounting flanges used to securely link prefabricated piping manifolds directly to raised-face valves, strainers, instrumentation blocks, and storage vessels.

Frequently Asked Questions (FAQs)

Is ASTM A105 a carbon steel or stainless steel specification?

ASTM A105 is strictly a forged carbon steel material specification meant for ambient- and higher-temperature piping service. If your pipeline explicitly requires stainless steel for rust protection or food-grade compliance, the correct material standard to specify is ASTM A182 (such as Grade F304L or F316L).

What are the bolt hole configurations for a high-pressure 3-inch flange?

Bolt configurations depend directly on the high-pressure class rating specified under the ASME B16.5 standard:

Class 150: Utilizes 4 bolt holes with a 6.00-inch (152.4 mm) bolt circle diameter.

Class 300 / Class 600: Upgrades to 8 bolt holes with larger bolt circles and heavier bolt diameters to distribute increased high-pressure clamping loads safely.

What specific welding configuration is required to install a 3-inch Slip-On flange?

A slip-on flange requires a standard double fillet weld setup for proper code-compliant installation:

One robust fillet weld around the exterior where the hub neck meets the outer diameter of the pipe wall.

A secondary fillet weld inside the bore, where the pipe end is slid back slightly (typically equal to the pipe wall thickness plus 3mm) from the flange face to prevent heat or weld spatter from damaging the machined sealing surface.

Can a carbon steel Raised Face (RF) flange be safely bolted to a Flat Face (FF) Cast Iron valve?

It is highly recommended not to mate a Raised Face steel flange directly to a Flat Face cast iron component. Because cast iron is brittle, the concentrated clamping force generated by the raised face inside the bolt circle creates a bending moment that can crack or fracture the expensive cast iron valve body when torque is applied. Like-to-like face configurations are best engineering practice.

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

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, hardness values, yield/tensile strength data, and explicit compliance with international industrial standards to guarantee complete code traceability.

💡 Engineering Note

There is a metallurgical contradiction in this specification string. ASTM A105 explicitly designates forged carbon steel for ambient- and higher-temperature piping systems, whereas Stainless Steel 304 designates an austenitic chromium-nickel alloy engineered for high corrosion resistance.

At Kriloha Gaskets & Hardware, we can manufacture and supply this 3-inch configuration in either material program based on your pipeline’s exact environmental demands: High-Density Carbon Steel (A105) for robust utility environments or Austenitic Stainless Steel (Grade 304/304L) for severe chemical and rust protection. Below are the unified features for both premium variants built to this standard blueprint.