Import Astm A182 F316l Sw Union — Buy in Bulk from Supplier in China

This ASTM A182 F316L socket weld union is a forged stainless steel fitting designed for rapid assembly and disassembly in pressurised piping systems, manufactured to ASME B16.11 with MSS SP-83 dimensional control for the union-specific geometry. Available in 1/8 inch to 4 inch sizes with 3000, 6000 and 9000 pressure ratings, it provides a mechanical joint that can be broken without disturbing adjacent piping. The 316L low-carbon grade ensures that repeated welding and re-welling during maintenance cycles does not sensitise the material to intergranular corrosion.

The union construction comprises three primary components: a female socket weld end with internal thread, a male socket weld end with matching external thread, and a captive nut that draws the two halves together against a precision-machined spherical or flat seat. Standard 316L chemistry applies with molybdenum addition for pitting resistance in halide environments. The threaded joint surfaces require careful handling to prevent galling, particularly in austenitic stainless steel where thread seizure is a known risk without proper lubrication or anti-seize compound. Surface finish is white pickled as standard across the supplier's forged fitting range.

Process industries use this union for instrument connections, sample points and temporary bypass lines where frequent access is required. Compared to welded joints, unions add a potential leak path, so they are typically excluded from permanent high-integrity pressure boundaries in critical hydrocarbon service. Buyers should specify seat type (spherical ground seat is common for metal-to-metal sealing), thread lubricant restrictions for oxygen service, and whether the union is required with a parallel or tapered thread form. The supplier notes EN 10204 3.1 certificate availability, though buyers should confirm this covers the specific heat treatment and mechanical test batch.

Zhengzhou Huitong Pipe Fittings is located at Room 2004, Expo Center, Dongfeng Road, Zhengzhou 450000, Henan Province, China. The supplier carries an imported tier classification and harbor trust tier, indicating standard marketplace listing status without enhanced verification. The recorded response rate stands at 0.00 percent with zero average response hours, which signals that direct enquiry response may be delayed or managed through alternative contact methods outside the platform system.

The company's product scope spans forged socket weld and threaded fittings across carbon steel, alloy steel, duplex, nickel alloy and specialty grades. For this ASTM A182 F316L SW Union, the listing references MSS SP-83 conformance specifically for the union geometry. No data is provided about factory certification (ISO 9001, API Q1, PED module H), in-house testing capability, annual output, employee count, named customers or export history. Buyers are advised to request a supplier capability questionnaire and, where possible, arrange a factory assessment or third-party audit before committing to volume orders.