Hot-rolled thin sheet (foreign term: *latten*) is a metallurgical material with a thickness ranging from 1.2 to 6 mm. It is primarily processed and formed using continuous hot-rolling mills, thin-slab continuous casting and rolling lines, or ESP (Endless Strip Production) lines; it can also undergo pickling and annealing treatments to be produced as coiled hot-rolled thin strips. The product is categorized into two types: "as-rolled coils" and "finished coils." The material grades encompass carbon structural steel, low-alloy steel, alloy structural steel, and others, adhering to the GB/T 912 standard. Its typical mechanical properties include a tensile strength of ≥ 310 MPa and an elongation of ≥ 38%; specifically, the steel developed by Ansteel for passenger bus frameworks features a transverse elongation of ≥ 28% and successfully passes the 180° transverse cold bending test.
This material is widely utilized across various sectors, including machinery, automotive, construction, and energy. Specifically, it is employed in the manufacture of machine casings, vehicle springs, photovoltaic mounting brackets, corrosion-resistant vessels, and similar products. Through thin-slab continuous casting and rolling technology, it is possible to produce ultra-thin gauges down to 0.8 mm, with pickling and annealing processes applied to further enhance surface quality. Compared to cold-rolled thin sheets, this material is characterized by the presence of surface scale; furthermore, leveraging ESP technology enables the complete production process-from molten steel to a 0.7 mm finished coil-to be accomplished within just seven minutes.