On November 20th, Hay Think learned from BWSG Special Steel Technology Group that the first batch of stainless steel clad steel rebars in the company's special rolling mill had succeeded. This is the first new product in the industry.
With economic and social development, the use of new materials and technologies has become more and more extensive, and the demand for steel used in marine engineering such as coastal, port, island and reefs has increased year by year. The ordinary rebar currently used is susceptible to seawater corrosion, and the subsequent engineering maintenance costs are high. Offshore steel requires good corrosion resistance. Although the use of pure stainless steel rebar is good, it is expensive and costly. In recent years, the domestic and foreign metallurgical industries have begun to develop "stainless steel clad steel bars". The product has a double-layer metal structure, the inner layer is ordinary rebar and the outer layer is stainless steel, which is like putting a "stainless steel coat" on the rebar.
Since the beginning of last year, BWSG began to develop "stainless steel clad steel bars".
In September of this year, the raw material partner delivered the assembled billet (stainless steel multi-layer round billet) to BWSG. BWSG R&D personnel determine the process plan and make preparations for production and equipment. On November 11, the technical staff of the product R&D team tried rolling Φ25mm hot-rolled ribbed steel bars for reinforced concrete. During the rolling process, many problems encountered for the first time such as "alternate rolling of round billets and square billets" were ingeniously solved. The rolling process was stable and the first batch of 24 tons of stainless steel multi-layer rebar products came out.
After testing, the product has several major characteristics:
1. it has strong corrosion resistance, which fully meets the standards of stainless steel products;
2. it is high strength, and the yield strength exceeds that of stainless steel products of the same specification;
3. it is good plasticity, with a reduction of area of more than 30%;
4. it is cost-effective, and the market price is only about 1/3 of pure stainless steel rebar;
5. the appearance is beautiful. After the pickling process, the product has a bright stainless steel appearance.