Import 254smo Bolt, Stud — Buy in Bulk from Supplier in China

Zhengbang Super Alloy Ltd. manufactures these 254SMO bolts and studs to DIN933 standard with an M36x400 specification, a substantial fastener dimension suited to heavy structural and pressure-boundary applications. The 254SMO grade (UNS S31254) is a super austenitic stainless steel containing approximately 6% molybdenum, 20% chromium and 18% nickel, giving it a PREN (pitting resistance equivalent number) above 43, well above standard 316L. The surface is supplied without additional coating, relying on the base alloy's natural passivity for corrosion resistance. This specific M36x400 size with coarse metric thread is typically used in flanged joints, pressure vessels and subsea assemblies where galvanic compatibility and chloride resistance are critical.

The material chemistry follows the standard 254SMO composition limits: carbon maximum 0.020%, nitrogen 0.18-0.25%, molybdenum 6.00-6.50%, all contributing to its stability in sour gas and seawater environments. Mechanical properties typical for solution-annealed 254SMO bar stock include yield strength 310 MPa minimum, tensile strength 650 MPa minimum and 35% minimum elongation. The DIN933 specification means these are fully threaded bolts with hexagonal heads, as opposed to partially threaded DIN931 variants. Without surface coating, the fasteners avoid hydrogen embrittlement risks and are suitable for applications where coating adhesion or differential aeration would pose problems, though they require careful handling to prevent iron contamination during installation.

Buyers for this product are typically engineering contractors, offshore platform operators, desalination plant constructors and chemical process licensors who specify 254SMO for seawater handling, brine systems or aggressive chloride process streams. The M36 diameter suits medium-to-high load structural connections; the 400 mm length accommodates thick flanges or insulated piping configurations. Sourcing from Zhengbang Super Alloy Ltd. in Jiangsu Province, buyers should confirm thread class tolerance (standard 6g external, 6H internal), proof load testing certificates and whether third-party inspection (SGS, BV or equivalent) is available. Payment and shipment terms, including whether FOB Shanghai/Ningbo or CIF destination applies, require direct confirmation with the supplier.

Zhengbang Super Alloy Ltd. is located at East Of Xuning Road, Yaogou Industrial District, Sihong County, Suqian City, Jiangsu Province, China. The supplier holds an 'imported' tier classification and a 'harbor' trust tier within the marketplace system. The response rate shown is 0.00% with an average response time of zero hours, indicating no recorded inquiry responses. The company profile does not disclose year of establishment, factory size, annual output, specific quality certifications or named client references. No information is provided about in-house testing capabilities, third-party inspection partnerships or export experience to specific regions.

The listing presents Zhengbang Super Alloy Ltd. as a manufacturer of alloy fasteners including the 254SMO grade, though the profile does not specify whether production is in-house or subcontracted. The Jiangsu Province location places it within one of China's main stainless steel processing regions, with access to raw material from major Chinese mills. Buyers should verify the supplier's actual manufacturing scope, quality management system certification (ISO 9001 or equivalent), material traceability procedures and whether mill test certificates (MTC) to EN 10204 3.1 or 3.2 are available. The absence of response history suggests direct contact by phone or verified email may be more reliable than platform messaging for initial inquiry.