Study on Microstructure and Properties of A New Type of Sulfuric Acid and Hydrochloric Acid Corrosion-Resistant Cold Rolled Steel

A new type of corrosion-resistant cold rolled steel is taken as the object, and the effects of Mo and Sb elements on the microstructure, mechanical properties, and sulfuric acid and hydrochloric acid resistances of the steel are investigated. The results indicate that after adding Mo and Sb elements to the experimental steel, the ferrite grain size is only 6.24 μm, the yield strength is 384 MPa, the tensile strength is 459 MPa, and the elongation is 27.5 %. The mechanical properties can meet demands by regulates for the SPA-C steel. Besides, the corrosion rate of the experimental steel in the sulfuric acid medium is 0.14 mg/(cm²·h), and that in the hydrochloric acid medium is 0.31 mg/(cm²·h). The corrosion resistance of the experimental steel promotes by 10 times than that of the SPA-C steel.