A method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines

Abstract

The present invention relates to a method for producing spangle-free galvanized sheet based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production line, comprising the following steps: full headless thin slab continuous casting and rolling → pickling → Smoothing→heating→spangle-free galvanizing→passivation→coiling into spangle-free hot-dip galvanized coils; the invention realizes hot-rolling 0.8-4.0mm*900-1650mm spangle-free continuous pickling hot-dip galvanizing The production of steel plates shortens the process flow and saves energy. The product has good surface quality, high dimensional accuracy, stable performance, and reduces production costs. The product can replace some cold-rolled base material galvanized products and fill the gap in hot-based continuous pickling galvanized production. .

Description

technical field [0001] The invention relates to the field of galvanized sheet production, and more specifically relates to a method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines. Background technique [0002] At present, there are more than 600 hot-dip galvanizing medium and wide band production lines in China, with an annual production capacity of more than 100 million tons. Most of the production lines are galvanized products with spangles, and cold-rolled galvanized products are mostly used as the base material for thin-gauge galvanized products. [0003] Hot-dip galvanized sheets are mainly made of hot-based raw materials (above 2.0mm) and cold-based raw materials (below 2.0mm), and the main processes are hot rolling → pickling → heating → galvanizing → passivation → coiling and hot rolling → acid Washing→cold rolling→annealing→galvanizing→pas...

AI Technical Summary

Problems solved by technology

[0004] The thickness of traditional hot-based galvanizing raw materials below 2.0mm is the limit thin specification for hot rolling, the output is small, it cannot be mass-produced, the shape of the plate is not easy to control, and the thickness is uneven;

[0005] Cold-based products need to be processed by cold rolling and annealing processes. The process is complex and costly, and the cold-based raw materials with a thickness of more than 2.0mm are galvanized. The process speed is slow, the thickness of the zinc layer is not uniform, and there are many quality defects; The difficulty is high, and the strip steel is easy to run off and cause downtime accidents; the thick-gauge strip steel requires high tension in the whole line, and the heavy load of the roller system shortens the service life

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