Method for producing stainless steel slab by radian chamfer crystallizer continuous casting machine
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A chamfering crystallizer and stainless steel technology, which is applied in the field of metallurgy, can solve problems such as wide and deep slits, cracks at the edge of steel strips, affecting the yield of cold-rolled pickled plates and the utilization rate of cold-rolled plates, etc. Achieve smooth corners, eliminate edge cracks, eliminate corner cracks and sharp corners
Inactive Publication Date: 2020-06-16
SHANDONG TAISHAN STEEL GROUP
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Cracks appear on the edge of the steel strip after rolling; when the conventional slab crystallizer is used in the casting process of 400 series stainless steel, the shape of the narrow side of the slab is slightly concave, and the upper and lower corners are sharp, and the corners are turned inward during the hot rolling process , resulting in wide and deep slits after pickling of stainless steel strips, which affects the yield of cold-rolled pickled sheets and the utilization rate of cold-rolled sheets.
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Embodiment 1
[0023] In this embodiment 1, the 430 stainless steel slab in the 400 series has a thickness specification of 200mm and a width of 1520mm, and its chemical composition and mass percentage are: C: 0.061%, Si: 0.49%, Mn: 0.55%, P: 0.028 %, S: 0.003%, Cr: 16.43%, and the balance is Fe and unavoidable impurities.
[0024] A method for producing stainless steel slabs with a radian chamfering crystallizer continuous casting machine, comprising a molten iron dephosphorization process, a TSR furnace smelting process, an LF refining process, and a continuous casting process. The specific process steps are as follows:
[0025] (1) Dephosphorization process of molten iron: molten iron P: 0.126%, Si: 0.45%, adopt lime powder for dephosphorization, remove slag after dephosphorization, and after pretreatment, molten iron P: 121ppm.
[0026] (2) TSR furnace smelting process: the addition of high-carbon ferrochrome is 26.1%, dephosphorized hot metal P: 0.0121%, dephosphorized hot metal tempera...
Embodiment 2
[0031] The present embodiment 2 selects the 410S steel type conventional crystallizer slab corner shape in the 400 series for use and figure 1 Similarly, the corner shape of the 410 steel grade chamfering crystallizer slab is the same as figure 2 Similarly, the shape of the edge of the 410 steel conventional mold slab after hot rolling is the same as image 3 Similarly, the shape of the rear edge of the 410 steel chamfering crystallizer slab after hot rolling is the same as Figure 4 Similarly, the slit line and the Figure 5 Similarly, 410 steel grade chamfering crystallizer slab hot-rolled pickling after slit line and Image 6 It is similar, so the drawings corresponding to Embodiment 2 are omitted.
[0032] In this example, the 410S stainless steel slab has a thickness specification of 200mm and a width of 1520mm, and its chemical composition and mass percentage are: C: 0.045%, Si: 0.52%, Mn: 0.22%, P: 0.035%, S: 0.002% , Cr: 12.55%, the balance is Fe and unavoidable i...
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Abstract
The invention discloses a method for producing a stainless steel slab by a radian chamfer crystallizer continuous casting machine. The method comprises the steps of molten iron dephosphorization, TSRfurnace smelting, LF refining and continuous casting; and according to the continuous casting process, the radius R of a chamfer arc of a crystallizer is 80-82 degrees, the diameter width of the chamfer arc is 39-40 mm, the flow rate of cooling water in a copper plate water tank of the chamfer crystallizer is 7.9-8.2 m/min, the water quantity of the narrow surface of the chamfer crystallizer is 450-550 L/min, and the water quantity of the wide surface is 3800-4200 L/min. Compared with the prior art, the method adopts molten iron pre-dephosphorization and TSR furnace desulfurization process, the soft blowing and calming time is prolonged by an LF furnace, low oxygen, low phosphorus and low sulfur are realized, and inclusions are controlled; cooling parameters of the crystallizer and a fan-shaped section are designed to adopt a conventional pressing mode and electromagnetic stirring so as to slow down the corner cooling strength of a casting blank and eliminate corner cracks and sharp corners; the edge loss phenomenon of a hemmed part of hot rolled steel is avoided; and therefore, the depth and the width of a slit line of a steel coil product are reduced, the product quality is improved, and the economic benefits are greatly improved.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing stainless steel slabs by a radian chamfering crystallizer continuous casting machine. Background technique [0002] The corners of 400 series stainless steel slabs are affected by the cooling intensity during the pouring process, and micro-cracks are prone to appear. Cracks appear on the edge of the steel strip after rolling; when the conventional slab crystallizer is used in the casting process of 400 series stainless steel, the shape of the narrow side of the slab is slightly concave, and the upper and lower corners are sharp, and the corners are turned inward during the hot rolling process , resulting in wide and deep slit lines of the stainless steel strip after pickling, which affects the yield of cold-rolled pickled plates and the utilization rate of cold-rolled plates. [0003] Therefore, it is necessary to develop a production method for 400 ser...
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