Recently, Shanxi Jianlong developed 760MPa solid high-strength welding wire steel and completed offline testing and application in the customer's factory.

The product's mechanical properties, such as yield strength and tensile strength of the deposited metal, have reached the matching standard of 760MPa high-strength steel plates. It marks that Shanxi Jianlong has made a breakthrough in high-strength welding wire steel.

Against the background of the global goal of "carbon peak and carbon neutrality," metal materials continue to develop in the direction of high strength and high performance. This trend not only promotes the lightweight process of building structures, engineering equipment, automobiles, bridges, shipbuilding, transportation, and other industries but also makes positive contributions to reducing the use of steel materials and reducing energy consumption. The matching of welding materials is one of the key conditions for the application of high-strength steel. Because of its difficulty in research development and production, it has now become an important research topic in the field of materials and welding.

Shanxi Jianlong has accumulated rich experience in the field of welding wire steel production and can supply common varieties of welding wire steel such as H08A, H08Mn, H10Mn2, EM12, ER50-6, ER70S-6 in batches. The company has successfully developed several customized products with excellent quality and stable performance, such as EM12-GM and ER70S-6J.

The high-strength welding wire steel developed by Shanxi Jianlong this time is mainly used to manufacture 760MPa-level gas-shielded welding solid welding wire. In the process of product development, Shanxi Jianlong faced multiple technical challenges. First, the product has high strength and high content of alloy elements such as Si, Mn, Cr, Ni, and Mo. Therefore, a certain amount of Ti element is added at the same time to promote droplet refinement during welding, and the overall smelting and continuous casting control are more difficult. Second, customers require better impact toughness. It requires strict control of S, P, O, and N content. In addition, to ensure welding quality, the requirements for the content of residual elements such as Al and Ca are also relatively stringent. Third, the final wire diameter is small (Φ0.8-1.2mm). Customers require products with high strength and good drawing performance. This requires strict control of inclusions, design of appropriate wire rod controlled rolling and controlled cooling processes, and precise control to obtain ideal microstructure and surface quality.

Faced with the above challenges, Shanxi Jianlong's technical team acted quickly, organized technical backbones from multiple departments to work together to tackle key problems, closely connected with customer needs, repeatedly discussed process plans, overcame many technical difficulties, and tracked the trial production process throughout, completing the production and delivery of the product in just 20 days. Verified by customers, the product has good drawing performance, the metal deposition strength reaches 820MPa, and all performance indicators fully meet customer requirements. This achievement not only demonstrates Shanxi Jianlong's strong strength in smelting and rolling technology but also marks that the company's production control level for high-difficulty steel varieties has reached a new level.