The first batch of 25mm diameter hot-rolled carbon steel-stainless steel composite steel bars rolled by Chinese high-strength precision stainless steel strip manufacturer GXLG Special Metal Technology Group rolled off the assembly line. After testing, the surface quality of the finished product is good, the yield strength and tensile strength are high, and the indicators are excellent, which fully meets the standard of stainless steel composite steel bars.
Rebar corrosion is the first factor affecting the durability of infrastructure. The compactness of the concrete, the thickness of the protective layer, carbonization, environmental humidity, and chloride ion intrusion can all cause corrosion of the steel bars in the concrete. In this regard, the global steel industry is actively developing stainless steel bars with excellent corrosion resistance.
GXLG, as the largest steel conglomerate in South China, Southwest China and the Pan-Beibu Gulf Economic Circle, is striving to promote the advancement of metal materials to mid- to high-end.
In 2018, after the national standard for hot rolled carbon steel-stainless steel composite steel bars for reinforced concrete was released, GXLG launched the research and development of stainless steel composite steel bars. From the introduction of stainless steel composite steel bars into the furnace, the establishment of a suitable heating system, the improvement of the processing of the rolls, and the installation of the rolling mill, all have formulated strict plans. At the same time, by controlling the variables such as vacuum degree and cooling rate to obtain a composite interface with excellent quality, it ensures a one-time success of test rolling and lays a solid foundation for later mass production.
GXLG Group's successful development of stainless steel composite rebar will lay the foundation for the development of high-precision wire rod, round steel, angle channel steel and other stainless steel composite products.