Preparation method of thick medium and high chromium ferritic stainless steel
A technology of high chromium ferrite and manufacturing method, which is applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as difficult pickling, achieve surface quality improvement, main performance optimization, and avoid strip breakage Effect
Inactive Publication Date: 2012-01-11
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for manufacturing thick-gauge medium and high-chromium ferritic stainless steel, which can solve the problem in the prior art that the oxide scales on the surface of medium- and high-chromium ferritic stainless steel are difficult to pickle, and can To prevent thick-gauge medium and high-chromium ferritic stainless steel strips from being broken during the cold rolling or rough grinding process, reduce the occurrence of production accidents, and at the same time effectively promote the formation of oxide scales and ferritic stainless steel on the surface of the material. Body stripping to improve surface pickling quality of ferritic stainless steels and material properties of hot coil annealed pickled coils
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[0018] First, 6 ferritic stainless steel samples of grade 444 were taken on the production line, and their length, width, and height were 5mm, 300mm, and 600mm, respectively. Take 5 samples randomly, and hot-roll them one by one to form steel coils with oxide scales, and then place them on a reversible 4-roll single-sheet cold-rolling testing machine (not shown in the figure) at a temperature of 40-70°C. Within the range, cold rolling is performed once with a reduction rate greater than 20% (see Table 2 below for specific temperature and reduction rate values), followed by annealing and pickling treatment, and the annealing and pickling processes adopt conventional processes. Take the last sample as a comparative example, and process it according to the existing conventional process, that is, first hot-roll it into a steel coil with an oxide scale, and then perform annealing and pickling treatment on it.
[0019] Take the sample made according to the existing conventional proc...
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The invention discloses a preparation method of thick medium and high chromium ferritic stainless steel. The method comprises the following steps: 1. processing ferritic stainless steel stock to obtain steel coils with scale; 2. performing steel belt temperature and first pass cold rolling on the steel coils with scale which are processed through hot rolling; 3. annealing heat treatment; and 4. pickling. By using the method of the invention, the plasticity of thick ferritic stainless steel can be increased, the steel belt breaking phenomenon can be effectively avoided, the scale on the surface of the body can be effectively peeled and the scale on the surface of the material is easier to remove through the annealing and pickling treatments, compared with the conventional technology. In addition, the internal grain size of the material which is processed through cold rolling and annealing is smaller so that the main performances of the material such as yield ratio can be optimized and become more reasonable and the surface roughness of the finished product can be better improved.
Description
technical field [0001] The invention relates to a method for manufacturing stainless steel, in particular to a method for utilizing the waste heat (strip temperature) of hot-rolled ferritic stainless steel and medium and high-chromium ferritic stainless steel with a thickness of ≥ 5 mm for cold-rolled raw materials with iron scale. The field of stainless steel product manufacturing. Background technique [0002] Ferritic stainless steel, especially medium and high chromium with low C and N content (referring to 16-20% and 20-30% by weight of Cr respectively) ferritic stainless steel is more and more popular. This is because compared with the traditional ferritic stainless steel with high C and N content, its corrosion resistance and processing performance are greatly improved, and its comprehensive performance is better than nickel-containing austenitic stainless steel in many applications. Body stainless steel. However, in the manufacturing process of medium and high chro...
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IPC IPC(8): B21B1/22B21B37/00C21D9/52C21D1/26
Inventor 徐军王晓琴李伯平刘竑
Owner BAOSHAN IRON & STEEL CO LTD