Why is Alloy 20 required for copper leaching raffinate loops?

Copper mining heap leaching involves recycling dilute sulfuric acid (raffinate solution) back over ore beds. Raffinate contains highly corrosive low-pH acid scoured with abrasive silica sands and active chlorides. Standard SS316 CF8M fails rapidly in this active reducing-acid environment due to localized pitting and scour. Alloy 20 (UNS N08020 / ASTM A351 Grade CN7M) contains high Nickel (32-38%), Chrome (19-21%), and Copper (3-4%) stabilized with Niobium, providing exceptional resistance to localized chloride pitting and acid dissolution.

Can you ship Qty 1 sample Alloy 20 valves to Utah or Arizona job sites?

Yes, we accommodate custom estimation trials, engineering verification orders, and small-batch orders (including Qty 1 check or gate valves). We package all orders with complete trace EN 10204 3.1 Material Test Certificates (MTC) and ship door-to-door (DAP Incoterms 2020) via air freight directly to your mining facility.

Do you accept wire transfers in US Dollars for US purchases?

Yes, all estimations and proforma invoices for US clients are billed directly in US Dollars (USD). Payments are processed through secure international bank SWIFT wire transfers (using MT103 confirmation details).

Alloy 20 Valve Supplier in Salt Lake City & Tucson | Mining Loops

USA Leaching Line Compliance: We specialize in solving corrosion failure in active copper leach loops. Our **Alloy 20 dual-plate check valves** feature Hastelloy C276 spring closures, completely eliminating reverse flow surges and corrosion wear on structural hinges. We provide door-to-door air freight (DAP) directly to operations in Saint George, Salt Lake City, Tucson, and Phoenix.

Alloy 20 Valve Configurations for Mining Circuits

Wafer Check Valves

Standards: API 594, API 598, ASME B16.34
Sizing: NPS 2" to 12" | Class 150/300
Dual-plate wafer check profile featuring integral metal-to-metal seating and spring-assisted closure in Alloy 20 / Hastelloy C276 to prevent water hammer scours.

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Bolted Bonnet Gate Valves

Standards: API 603, API 600, ASME B16.34
Sizing: NPS 1/2" to 24" | Class 150/300
Full-bore solid wedge gate design, OS&Y (Outside Screw & Yoke) stem in ASTM B473, and integral seat rings to eliminate boundary boundary leaks in acid transfer lines.

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Ball Valves (2-Pc / 3-Pc)

Standards: API 608, API 607 (Fire-Safe)
Sizing: NPS 1/2" to 8" | Class 150/300
Bubble-tight shutoff with reinforced Teflon (PTFE) or PEEK soft seats for organic acids and sulfuric acid blends under 120°C (248°F).

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Metallurgy Matrix: Dilute H2SO4 Leaching Systems

Standard Stainless Steel (SS316 / CF8M) fails rapidly in copper leaching raffinate loops due to active scour and chloride pitting. Alloy 20 (Grade CN7M) maintains complete boundary protection:

Medium / Concentration	SS316 (CF8M)	Alloy 20 (CN7M)	Hastelloy C276
Diluted Sulfuric Acid (5% - 20%)	Active Corrosion	A - Excellent	A - Excellent
Raffinate Loop (Acid + Impurities + Sand)	Rapid Pitting & Wear	A - Excellent	A - Excellent
Sulfuric Acid Dilution Lines (Exothermic)	Catastrophic Failure	A - Excellent	A - Excellent

Direct USA Estimations & Logistics

We eliminate import shipping friction. We provide full banking wire transfer invoices (via SWIFT MT103 in US Dollars), ISO 10204 3.1 Material Test Certificates (MTC) proving foundry trace elements, and direct air-freight door-to-door (DAP Incoterms 2020) to your site.

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