Why specify Alloy 20 instead of SS316 for sulfuric acid dilution in Texas refineries?

SS316 CF8M fails rapidly in the 20–40% sulfuric acid concentration range and in exothermic dilution lines where localized heating accelerates corrosion. Alloy 20 (UNS N08020 / CN7M) contains nickel, chromium, copper, and niobium stabilization that resists sulfuric acid attack across the concentration spectrum where carbon steel and 316L are unsuitable.

Do you ship Alloy 20 valves DAP to Houston and Gulf Coast job sites?

Yes. We arrange door-to-door DAP Incoterms 2020 delivery via air freight to Houston airports or sea freight to Port Houston / Port of Galveston. Proforma invoices are issued in USD with wire transfer payment terms.

What documentation accompanies Alloy 20 valve shipments to US EPC contractors?

Every shipment includes EN 10204 Type 3.1 Material Test Certificates (MTC) with foundry heat analysis, mechanical test results, API 598 hydrostatic shell and seat test reports, and commercial invoice with HS code 84818030.

Alloy 20 Valve Supplier in Houston Texas | Sulfuric Acid & Petrochemical

Gulf Coast Petrochemical, Sulfuric Acid Dilution, Alkylation, Chemical Processing: Gulf Coast Chemical Compliance: Our Alloy 20 dual-plate wafer check valves meet API 594 / API 598 with full CN7M construction — body, discs, hinge pins (ASTM B462), and integral seat rings. Inconel X-750 springs per ASTM B637. Spiral-wound SS316/Grafoil gaskets per ASME B16.20. DAP air freight to Houston Hobby (HOU) or Bush Intercontinental (IAH).

Alloy 20 Valve Configurations

Wafer Check Valves

Standards: API 594, API 598, ASME B16.34
Sizing: NPS 2" to 12" | Class 150/300
Full Alloy 20 construction with Inconel X-750 spring, integral metal-to-metal seating, non-slam closure.

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Gate & Globe Valves

Standards: API 600/603, API 623
Sizing: NPS 1/2" to 24" | Class 150/300
OS&Y bolted bonnet gate and globe valves in ASTM A351 CN7M for acid transfer and isolation.

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Ball Valves

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

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Material Selection: Alloy 20 vs SS316

Service	SS316 (CF8M)	Alloy 20 (CN7M)
Sulfuric Acid 20–40%	Rapid Corrosion	Excellent
Sulfuric Acid 97% (concentrated)	Unsuitable	Excellent
Phosphoric Acid / Fertilizer	Limited Life	Excellent
Copper Raffinate (acid + chlorides)	Pitting Failure	Excellent

US Procurement: DAP Delivery & USD Invoicing

DAP Air Freight

Door-to-door delivery under Incoterms 2020 DAP. Air freight from Ahmedabad (AMD) to US destination airport included in unit price.

USD Wire Transfer

Proforma invoices in United States Dollars. 50% advance, 50% before dispatch. SWIFT wire to Kotak Mahindra Bank.

EN 10204 3.1 MTC

Full material traceability with foundry heat analysis, mechanical tests, and API 598 hydrostatic test reports on every valve.

Request Alloy 20 Valve Quotation (USD)

Submit valve type, NPS size, pressure class, end connection, and quantity. Engineering response within 24 hours.

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Alloy 20 Valve Supplier in Houston & Gulf Coast Texas