Import A240 Uns S31803 Plate — Buy in wholesale FOB from Supplier in China

The A240 UNS S31803 Plate is a duplex stainless steel flat product conforming to ASTM A240, manufactured from a nitrogen-alloyed 22% chromium, 5% nickel, 2.5% molybdenum grade that delivers approximately twice the yield strength of austenitic grades such as 316L. This ferritic-austenitic duplex structure provides superior resistance to stress corrosion cracking, chloride pitting, and crevice corrosion compared to standard stainless steels. Zhengzhou Huitong Pipe Fittings, based in Henan Province, China, offers this material in plate, sheet, and coil forms with thickness from 0.4 mm to 100 mm and surface finishes including No.1, 2D, 2B, BA, and polished options. The grade is specified for applications where combined corrosion resistance and mechanical strength justify the alloy premium over conventional stainless steels.

The UNS S31803 composition, also known as Alloy 2205 or duplex 2205, balances approximately 50% ferrite and 50% austenite at room temperature through careful control of chromium, molybdenum, nickel, and nitrogen. Typical mechanical properties include minimum yield strength of 450 MPa, tensile strength of 620 MPa, and elongation of 25% in the annealed condition, though actual values vary with product form and thickness. Hot rolled plate receives a No.1 finish with mill scale intact, while cold rolled and annealed product achieves 2B or brighter finishes. The PREN (pitting resistance equivalent number) of approximately 35 positions this grade for moderately aggressive chloride environments, though S32750 or S32760 may be preferred for severe conditions. Welding requires controlled heat input and filler metal overmatching in nickel content to preserve the duplex microstructure in the heat-affected zone.

Primary consumers of UNS S31803 plate include oil and gas subsea equipment fabricators, chemical process vessel constructors, desalination plant operators, pulp and paper mill engineers, and marine structural designers. The material serves pressure vessels, heat exchangers, storage tanks, offshore platforms, and flue gas desulphurisation scrubbers where 316L would be prone to chloride stress corrosion. When approaching Zhengzhou Huitong, buyers should confirm the specific thickness, width, and length dimensions available from stock or mill order, as well as the exact surface finish required for their fabrication sequence. The listing indicates availability of standard mill test certificates and export packaging, though specific certification scope and third-party inspection options require direct confirmation with the supplier.

Zhengzhou Huitong Pipe Fittings is located at Room 2004, Expo Center, Dongfeng Road, Zhengzhou 450000, Henan Province, China. The supplier operates from a commercial office address rather than a manufacturing site, suggesting trading or distribution activity alongside potential mill partnerships. The company profile indicates imported tier status with harbour trust tier, and a 0.00% response rate with zero recorded response hours. This limited engagement data means buyers cannot rely on platform-tracked communication reliability and must establish direct contact channels to assess responsiveness and technical competence.

The listing presents Zhengzhou Huitong as a supplier of diverse corrosion-resistant alloys including duplex stainless steels, nickel alloys, and super-austenitic grades, with S31803 plate featured within a broad product portfolio. No information is provided regarding company founding date, employee count, annual turnover, manufacturing certifications, or reference projects. Buyers should not infer scale or capability beyond what is stated. The supplier's geographic position in central China offers logistics alternatives to coastal mill direct supply, with potential cost or flexibility advantages for certain order patterns. Direct verification of stock holding, mill relationships, and quality control procedures is recommended before committing to substantial orders.