Manufacturing method of continuously-annealed SPCC (steel plate cold-rolled common) steel strip with performance approaching performance of batch annealing product and continuously-annealed SPCC steel strip
A manufacturing method and steel strip technology, applied in the field of metallurgy, can solve problems such as high yield strength of products, achieve the effects of optimizing product structure and precipitation, shortening the annealing process, and improving production efficiency
Active Publication Date: 2020-11-20
LIUZHOU IRON & STEEL +1
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[0004] The invention provides a manufacturing method of continuous annealing of SPCC steel strips and continuous annealing of SPCC steel strips, that is, a method for manufacturing continuous annealing of SPCC steel strips and continuous annealing of SPCC steel strips with performance close to that of covered products, so as to solve the problem of existing SPCC steel strips. The problem that the continuous annealing process makes the product yield strength higher
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[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
[0028] Invention principle:
[0029] The applicant compared the metallographic structure of the continuously returned product and the masked returned product. The metallographic structure of the continuous return product and the cover return product are as follows: Figure 1a and shown in b. Compared with the annealed product, the continuous annealed product has a smaller grain size, less carbide precipitation in the steel, and the carbon element mainly exists in the form of solid solution carbon in the steel. The applicant believes that the smaller grain size and higher solid solution carbon content are the main reasons for the high yield strength and easy yield plateau of continuously annealed products.
[0030] The existing continuous annealing process for SPCC s...
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The invention provides a manufacturing method of a continuously-annealed SPCC (steel plate cold-rolled common) steel strip with performance approaching performance of a batch annealing product and thecontinuously-annealed SPCC steel strip. The manufacturing method of the continuously-annealed SPCC steel strip with the performance approaching the performance of the batch annealing product comprises the step that continuous annealing operation is conducted after the steel strip is subjected to cold rolling operation. According to the continuous annealing technological parameters, the outlet temperature of a heating zone is 810 DEG C+ / -2 DEG C, the outlet temperature of a soaking zone is 810 DEG C+ / -2 DEG C, the outlet temperature of a slow cooling zone is 720 DEG C+ / -2 DEG C, the outlet temperature of a rapid cooling zone is 400 DEG C+ / -2 DEG C, the outlet temperature of an overaging zone is 400 DEG C+ / -2 DEG C, and the outlet temperature of a final cooling zone is 170 DEG C+ / -2 DEG C.According to the chemical components of the continuously-annealed SPCC steel strip, the steel strip comprises, by weight percentage, 0.05%-0.07% of C, smaller than or equal to 0.02% of Si, 0.1%-0.2% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.015% of S, smaller than or equal to 0.005% of N and 0.03%-0.05% of Al. According to the manufacturing method, the steelmaking technological process is shortened, the annealing technological process is also shortened, the production efficiency is improved, the cost is reduced, and the product organization and precipitation are optimized.
Description
technical field [0001] The invention relates to the field of metallurgy, in particular to a continuous annealing process for low yield strength SPCC steel strips, in particular to a continuous annealing SPCC steel strip manufacturing method and a continuous annealing SPCC steel strip whose performance is close to that of an annealed product. Background technique [0002] Common cold-rolled steel plate SPCC (Steel plate cold-rolled common) is a low-carbon aluminum-killed steel widely used in the automobile manufacturing industry, home appliance industry, galvanized tin-plated substrate, etc., and occupies a dominant position in the current cold-rolled product market . There are two main ways to produce SPCC products: bell annealing (referred to as hood annealing) and continuous annealing (referred to as continuous annealing). Compared with the two production processes, SPCC products produced by the continuous annealing process have good surface quality, stable and uniform per...
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Login to View More IPC IPC(8): C21D9/56C21D11/00C21D1/26C21D6/00C22C38/02C22C38/04C22C38/06
CPCC21D9/561C21D11/00C21D1/26C21D6/008C21D6/005C22C38/02C22C38/04C22C38/06
Inventor 周博文樊雷叶姜钱学海蒋才灵杨跃标阮志勇邓深董苑华张应强庞通陆茂森
Owner LIUZHOU IRON & STEEL