Manufacturing method of hot-dip galvanized steel belt with yield strength over 580 Mpa level

Abstract

The invention discloses a manufacturing method of a hot-dip galvanized steel belt with yield strength over the 580 Mpa level. The method comprises the following steps that chemical compositions and mass percentage for manufacturing the steel belt are selected, and the chemical compositions comprise 0.16%-0.20% of C, smaller than or equal to 0.05% of Si, 1.1%-1.3% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.02% of S, 0.025%-0.06% of Als and the balance Fe and inevitable impurity; the chemical compositions are subjected to smelting and continuous casting, a plate blankis formed, and the thickness of the plate blank is 230 mm; the working procedure of hot rolling is carried out; the working procedure of acid continuous rolling is carried out; and the working procedure of hot-dip galvanizing is carried out. According to the manufacturing method of the hot-dip galvanized steel belt with yield strength over the 580 Mpa level, the composition design is simple, precious alloy elements are not added, the 600-630 DEG C semi-annealing technology is adopted, energy consumption is small, the production cost is low, the high yield strength and certain machining performance can be achieved, and the requirements of industries like building can be met.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for manufacturing a hot-dip galvanized steel strip with a yield strength above 580 MPa. Background technique [0002] Although the rapid expansion of production capacity of galvanized sheets for cold-rolled structures has greatly exceeded the growth of market demand, for high-strength galvanized sheets with excellent corrosion resistance mainly used for load-bearing structures, due to factors such as high strength and high cost, The output accounts for a relatively low proportion of the total and cannot meet the market demand yet. The hot-dip galvanized high-strength steel of the present invention adopts the hot-dip galvanizing production process of the United States Iron and Steel Co., Ltd. and the continuous hot-dip galvanizing unit of the vertical annealing furnace. Finally, the method of controlling the galvanizing and annealing process can adjust the structure o...

AI Technical Summary

Problems solved by technology

The low coiling temperature of hot rolling leads to too fine grains and high yield strength; the range of cold rolling reduction is narrow, which limits the expansion of product specifications; The temperature, rapid cooling temperature, furnace temperature and zinc pot temperature are not clearly mentioned, and have a great impact on the final performance fluctuations

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