In the world of high-performance metallurgy, AWS A5.9 ER347 stands as a critical solution for environments where standard stainless steel fails. Known as a niobium-stabilized austenitic stainless steel, 347 welding wire is specifically engineered to combat intergranular corrosion.
By adding Niobium, the carbon is "locked up" as niobium carbides, preventing the depletion of chromium at the grain boundaries during prolonged exposure to temperatures between 800°F and 1500°F (427°C - 816°C).
347 wire provides superior oxidation resistance compared to 308L or 316L, making it the preferred choice for exhaust manifolds, heat exchangers, and refinery equipment.
Pioneering Excellence in Welding Solutions Since 2004. Established in Wulian, Rizhao City, Shandong Province, we have grown into a globally recognized producer of premium welding consumables.
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Our 15,000-square-meter production facility in Shandong allows us to maintain complete control over the manufacturing of ER70S-6 MIG Wires, E71T-1C Flux-Cored Wires, and specialty Stainless Steel Wires. All products meet stringent international standards, including ISO9001 and CE certifications, with tolerances maintained 30% stricter than industry averages.
China's dominance in stainless steel raw material production ensures a stable supply of high-purity niobium and chromium alloys required for 347 grade wire.
Leading Chinese factories utilize automated drawing and cleaning lines that ensure zero surface contamination, critical for TIG and MIG applications.
Mass production capabilities and optimized logistics from Shandong ports allow for highly competitive wholesale pricing without sacrificing metallurgical integrity.
As power plants transition to ultra-supercritical cycles to increase efficiency, the demand for 347-stabilized joints has surged. Our wires are designed to withstand these 600°C+ operational temperatures without embrittlement.
Hydrogen production and carbon capture facilities require materials that resist high-temperature hydrogen attack (HTHA). ER347 wire provides the necessary stability for these critical infrastructure components.
347 wire is used for welding titanium-stabilized stainless steels in aircraft collector rings and stack liners where cyclic heating is constant.
Used in the fabrication of large-scale nitric acid and fatty acid processing equipment to prevent corrosion in the heat-affected zone (HAZ).
Critical for hydrocracking units where polythionic acid stress corrosion cracking is a major risk during downtime.
For international procurement managers, sourcing the right grade of China 347 welding wire involves more than just price comparison. It requires a deep understanding of compliance and logistics:
308L is a low-carbon grade for general 304 stainless steel welding. 347 is stabilized with Niobium, specifically for high-temperature service (400°C-800°C) to prevent sensitization and intergranular corrosion.
Yes. 347 is the standard recommended filler for welding 321 (titanium-stabilized) stainless steel, as titanium does not transfer well across the welding arc, whereas Niobium transfers efficiently.
Typically, a mixture of Argon with 1-2% Oxygen or CO2 is used to stabilize the arc. For TIG welding, 100% high-purity Argon is required.
We use optical emission spectrometers (OES) to test every heat of raw material before production, ensuring the Niobium-to-Carbon ratio meets the AWS A5.9 standard (minimum 10x carbon content).
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