Alloy 20 Y Strainers

At Falcon, we provide targeted material solutions for the world’s most aggressive chemical environments. Our Alloy 20 Y-Strainers are the industry benchmark for applications involving sulfuric acid, offering immunity to chloride stress corrosion cracking and exceptional resistance to general acid corrosion.

Alloy 20 is a columbium-stabilized austenitic nickel-iron-chromium alloy with additions of copper and molybdenum.

• Sulfuric Acid Specialist: Specifically designed to withstand boiling sulfuric acid ($H_{2}SO_{4}$) at concentrations up to 40%, and excellent resistance to higher concentrations at lower temperatures.

• Columbium (Niobium) Stabilization: The addition of columbium prevents intergranular corrosion by minimizing carbide precipitation during welding and high-heat service.

• SCC Immunity: The high nickel content provides superior resistance to chloride-ion Stress Corrosion Cracking (SCC) compared to 300-series stainless steels.

• Pitting Protection: Molybdenum and copper additions protect the strainer body and internal screens in phosphoric and nitric acid environments.

The premium choice for high-pressure chemical dosing, acid distribution, and sampling lines.

• Grain Integrity: Forging ensures a high-density material structure required for Class 300 and 600 systems where leak prevention is critical.

• Reliability: Best for small-bore piping in sulfuric acid pickling lines or precision chemical injection skids.

The industry standard for large-scale flow in chemical processing and fertilizer plants.

• Grade CN7M: This is the precise cast designation utilized by Falcon for our Alloy 20 Y-strainer bodies.

• Economic Protection: Provides a cost-effective solution for larger diameters while maintaining the alloy's signature resistance to aggressive mineral acids.

Falcon ensures every Alloy 20 unit is fully traceable and complies with these global designations:

Falcon’s Alloy 20 strainers are indispensable in:

• Sulfuric Acid Pickling: Protecting pumps and nozzles in steel mill acid cleaning lines.

• Chemical Production: Used in the manufacture of plastics, explosives, synthetic rubber, and fertilizers.

• Petrochemical Refining: Essential for alkylation units where sulfuric acid is a primary catalyst.

• Pharmaceutical Synthesis: Handling aggressive catalysts and acidic reagents in bulk drug production.

• Food & Dye Processing: Managing organic and fatty acids that cause pitting in standard stainless steels.

• Design Code: ASME B16.34 (Valves and Pressure Components).

• Pressure Ratings: ANSI Class 150 through Class 600.

• Testing: 100% shell and seat pressure testing per API 598.

• End Connections: Flanged (RF), Socket Weld (SW), and NPT Threaded.

Falcon Quality Assurance: Every Alloy 20 Y-Strainer includes a full EN 10204 3.1 Material Test Report (MTR). Falcon ensures that all internal mesh or perforated screens are also manufactured from UNS N08020 to eliminate any risk of galvanic corrosion or localized acid attack.

Falcon Engineering Insight: While Alloy 20 is the go-to for sulfuric acid, it also performs exceptionally well in phosphoric acid and nitric acid environments. Its high nickel content (approx. 35%) ensures it remains stable in chloride-rich environments that would cause 316L to crack.