Explore our highly requested commercial and industrial grade solid & flux-cored wires manufactured in our state-of-the-art facilities.
An authoritative analysis of chemical compositions, mechanical specifications, and intergranular corrosion resistance values.
Within high-temperature chemical environments, standard austenitic stainless steels suffer from a process called **sensitization**. When exposed to temperatures between 450°C and 850°C, carbon diffuses to the grain boundaries, bonding with chromium to form chromium carbides. This strips the local boundary areas of their chromium protection, leaving the weld joint prone to **intergranular corrosion** (IGC).
**ER318 (AWS A5.9 / EN ISO 14343-A G 19 12 3 Nb)** solves this issue through the strategic addition of **Niobium (Nb)**, also referred to as Columbium. Niobium possesses a stronger thermodynamic affinity for carbon than chromium. It forms highly stable niobium carbides (NbC) dispersed throughout the steel matrix, ensuring chromium remains in solution to maintain the critical passive oxide layer.
Additionally, the inclusion of **2.0% - 3.0% Molybdenum (Mo)** ensures excellent resistance to localized halide attack (pitting and crevice corrosion), making ER318 the alloy of choice for acidic, chloride-rich, and high-stress applications.
| Alloy Class | C (%) | Mn (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | Nb (%) | Fe (%) |
|---|---|---|---|---|---|---|---|---|
| ER318 Standard | ≤ 0.08 | 1.0 - 2.5 | 0.30 - 0.65 | 18.5 - 20.5 | 11.0 - 14.0 | 2.0 - 3.0 | 10x C to 1.0 | Balanced |
| ER316L Comparison | ≤ 0.03 | 1.0 - 2.5 | 0.30 - 0.65 | 18.0 - 20.0 | 11.0 - 14.0 | 2.0 - 3.0 | - | Balanced |
| ER347 Comparison | ≤ 0.08 | 1.0 - 2.5 | 0.30 - 0.65 | 19.0 - 20.5 | 9.0 - 11.0 | - | 10x C to 1.0 | Balanced |
Pioneering Excellence in Welding Solutions Since 2004
Established in Wulian, Rizhao City, Shandong Province, Wulian Yuxin Hardware Equipment Co., Ltd. has grown from a locally excellent manufacturer to a globally recognized producer of premium welding consumables. With our own 15,000-square-meter production facility and advanced manufacturing equipment, we proudly maintain complete control over our production processes, ensuring consistent quality across our entire product range.
Our facility houses drawing blocks, heat treatment ovens, and winding machinery that enable a precise physical profile for our welding wires. By keeping all operations in-house, we eliminate external supplier variances, matching specifications required by critical fabrication codes worldwide.
How Wulian Yuxin utilizes automation to maintain wire tolerances 30% stricter than international standards.
We process raw wire rods through high-speed, continuous, tungsten carbide die-drawing lines. Dynamic lubricants maintain a clean surface finish, preventing micro-grooves that trigger erratic wire feeding in automated MIG torches.
Organic residue on the wire surface causes weld porosity and carbon pickup. Our inline multi-frequency ultrasonic washing baths guarantee zero residual drawing oils, conforming to clean surface standards of AWS A5.9.
Irregular winding disrupts robotic welding routines. Our automated spoolers ensure layer-by-layer alignment on plastic (D200, D300) and basket (K300) spools, preventing tangling during high-feed-rate applications.
A look into our 15,000㎡ facility equipped with modern wire drawing, layer winding, and testing systems.
Wulian Yuxin manufactures a wide scope of welding consumables matching major international engineering specifications.
Out-of-position welding capability with structured slag release and minimal spatter rates.
High-purity chemistry for petro-refinery, chemical tanks, and paper mill applications.
Straight cut lengths with precision-embossed ends indicating chemical brand and alloy grade.
Iron powder low-hydrogen coatings with arc start performance for thick plate structures.
How ER318 meets requirements in critical infrastructure and global logistical pathways.
Refineries run organic acids at high pressure. Our ER318 wire contains stable Niobium percentages preventing intergranular stress-corrosion cracking (SCC) at operational ranges up to 400°C.
Weldments inside heat exchangers require creep resistance and thermal cycle durability. The addition of stabilized Nb reduces grain boundary slip, maintaining structural stability under thermal loads.
We pack wires in heavy-duty cardboard cartons with silica gel desiccant packs to prevent moisture absorption during maritime transit from Qingdao port, supporting just-in-time warehouse inventories.
Deployments of Wulian Yuxin welding wires across complex structural projects.
Heavy structural steel frames welded with high arc stability, low clean-up costs.
Marine vessel fabrication using premium gas-shielded flux-cored wire for out-of-position welds.
Food grade processing vessel fabrication using stabilized stainless steel consumables.
High-integrity root pass pipe welding for natural gas transmission networks, verified through non-destructive radiographic analysis.
How Wulian Yuxin is adapting to global manufacturing shifts and industrial demands.
We are refining the wire composition of our ER318 alloys to reduce high-frequency micro-spatter under high-density laser arcs, matching automated automotive and high-speed rail lines.
We are transitioning to non-degreasing, zero-residual dry lubricant drawing techniques to cut industrial effluent and minimize cleaning cycles in end-user fabrication yards.
Wire Arc Additive Manufacturing (3D printing with welding wire) demands tight chemical variance. We provide specialized ER318 batches with low standard deviations in solidifying elements to ensure uniform layering.
Get answers to critical metallurgical questions from our engineering support team.
Connecting with partners worldwide. Our products are exported to Germany, Poland, Italy, Vietnam, Brazil, and over 20 countries.
Browse our complete list of welding consumables and application case products below.
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