BBN hot rolled 09cupcrni-a break through thickness limit

Quenching Improve the hardness of hot rolled 09cupcrni-a steel, Annealing is refine the grain size, homogenization, reduce hardness, improve the plasticity and eliminate interna stress. Normalizing refine grain , improve the impact toughness of hot rolled 09cupcrni-a steel and comprehensive mechanical properties.

After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the spread and development of rust and protects the substrate under the rust layer to slow down its corrosion rate. The amorphous spinel-type oxide layer with a thickness of about 50μm-100μm formed between the rust layer and the substrate is dense and has good adhesion to the substrate metal.

The global share of my country's steel production has increased substantially. In the first nine months of 2020, my country's crude steel output accounted for 58% of the world's total, pig iron accounted for 69%, and imported iron ore accounted for 71% of global iron ore exports. "Such a high proportion is a manifestation of the effective control of the epidemic situation in our country and the strong demand. As the situation of epidemic prevention and control in various countries gradually improves, the proportion of my country's output will gradually decline." Luo Tiejun said.