Import Astm B163 Uns N08810 Seamless Nickel Steel Tube — Buy in wholesale FOB from Supplier in China

ASTM B163 UNS N08810 seamless nickel steel tube from Ark Steel Tube is a cold-drawn Incoloy 800H alloy product designed for high-temperature heat exchanger and condenser service. The material composition is nickel 30-35 percent, chromium 19-23 percent, with iron constituting the balance, conforming to the UNS N08810 specification within the Incoloy 800 series. Outer diameters from this supplier range from 3.18 mm to 101.6 mm, with wall thickness spanning 0.5 mm to 20 mm, covering both precision instrumentation tubing and larger process piping requirements. The cold-drawn manufacturing technique refines grain structure and improves dimensional precision compared to hot-extruded alternatives, which matters for applications requiring tight tolerance control in thermal cycling environments.

Incoloy 800H (the 'H' denoting controlled carbon content of 0.05-0.10 percent and coarse grain size for enhanced creep resistance) differs from standard Incoloy 800 by its optimised high-temperature properties. The ASTM B163 specification governs seamless condenser and heat-exchanger tubes, with typical industry applications including steam generator tubing, ethylene furnace quench coolers, and refinery overhead condensers. The alloy's austenitic structure provides resistance to oxidation and carburisation at temperatures up to 1100 degrees Celsius, though maximum allowable design stresses follow ASME Boiler and Pressure Vessel Code Section VIII curves. Standard tolerances for cold-drawn seamless tubes in this product category are typically plus/minus 0.5 mm on OD for diameters under 38 mm, and plus/minus 1 percent for larger sizes, with wall thickness tolerance of plus/minus 10 percent.

Primary buyers include chemical process licensors, power generation OEMs, and oil and gas engineering contractors specifying alloys for sour service and high-temperature process streams. The tube's resistance to chloride stress-corrosion cracking and polythionic acid attack makes it suitable for petrochemical reactor effluent coolers and nuclear steam generator applications. Ark Steel Tube offers standard seaworthy packing for export, though specific packaging details such as end caps, VCI wrapping, or wooden crate specifications are not itemised. Payment terms referenced in the source include T/T, with price terms offered as FOB, CIF, or CFR. Exact minimum order quantities, confirmed lead times, and certification package details require direct negotiation with the supplier.

Ark Steel Tube operates from E802, Xintai Square, Taizhou, Zhejiang Province, China, with postal code 318000. The trust tier is 'harbor', indicating a baseline level of platform verification. The response rate shows 0.00 percent with zero average response hours, so no historical communication pattern can be assessed from the listing data alone. Buyers should initiate direct contact to evaluate technical responsiveness and English-language capability before relying on this supplier for specification-critical orders. The Zhejiang location places Ark Steel Tube within one of China's concentrated regions for specialty stainless and nickel alloy production, with access to Ningbo and Shanghai ports for export.

The supplier's product portfolio spans multiple material families: ferritic and martensitic stainless grades, austenitic and super-austenitic grades, duplex and super-duplex stainless steels, alloy steels for boiler and pressure service, carbon steel tubes, and extensive nickel alloy grades. Their nickel alloy coverage includes Hastelloy B/C/G series, Inconel 600/601/625/718, Incoloy 800/800H/800HT/825/925, Haynes 230/556, Monel 400, and Nickel 200/201. A notable capability highlighted is small-diameter precision stainless steel tube production in sizes such as 4.76 x 0.71 mm and 6.35 x 0.71 mm, with ultra-length capability to 500 metres in coil or straight lengths. The listing does not indicate whether Ark Steel Tube is a manufacturer, trader, or hybrid operation, nor does it state production capacity, number of employees, annual revenue, or named reference customers.