Heavy-gauge low-chromium ferritic stainless steel hot roller blind cover furnace annealing method
A stainless steel, thick gauge technology, applied in the field of ferritic stainless steel, can solve the problems of unrealizable welding process and limited application, and achieve the effect of reducing production labor costs and improving production efficiency
Inactive Publication Date: 2019-10-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
Although the existing low-chromium ferritic stainless steel production technology has been able to ensure that the typical impurity elements C, N, O, etc. are kept in a low range, in addition, Ti or Al and other fine grains can also be added according to different requirements. Particle elements to improve the performance and processability of low-chromium ferritic stainless steel with a thickness of less than 6mm; good performance can also be obtained through online continuous annealing, but ferritic stainless steel with a thickness greater than 6mm cannot be achieved due to welding process problems. This limits the application of thick-gauge low-chromium ferritic stainless steel as structural parts
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[0043] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples. For the experimental methods not indicating specific conditions in the following examples, follow conventional methods and conditions.
[0044] In the low-chromium ferritic stainless steels of Examples 1-6, except for iron and unavoidable elements, the content of each element is shown in Table 1. Among them, the technical parameters of the annealing method of the low-chromium ferritic stainless steel hot-rolled coils of Examples 1-6 using a full hydrogen gas bell furnace are shown in Table 2, and the mechanical properties of the corresponding low-chromium ferritic stainless steel products obtained are shown in Table 3 .
[0045] Table 1 Content of each element in low chromium ferritic stainless steel (%)
[0046]
[0047] The annealing technical parameter of table 2 embodiment 1-6
[0048]
[0049] Summary of the mechan...
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Abstract
The invention belongs to the technical field of ferritic stainless steel, and particularly relates to a heavy-gauge low-chromium ferritic stainless steel hot roller blind cover furnace annealing method which comprises the following steps of (1) adopting a hot roller blind cover furnace for heating a low-chromium ferritic stainless steel hot roll coil to 750 to 800 DEG C at the speed of 30 to 60 DEG C / h, and preserving heat for 2 to 5 hours; (2) continuously heating the low-chromium ferritic stainless steel hot roll coil to 830 to 880 DEG C, and preserving heat for 10 to 16 hours; and (3) slowly cooling a hot roll coil heat-preservation cover to 500 DEG C to 600 DEG C, rapidly cooling, discharging, and finally obtaining a low-chromium ferritic stainless steel product. According to the heavy-gauge low-chromium ferritic stainless steel hot roller blind cover furnace annealing method provided by the invention, through optimizing a cover furnace annealing technology, the heavy-gauge low-chromium ferritic stainless steel hot roller has a low hardness value and excellent strength.
Description
technical field [0001] The invention belongs to the technical field of ferritic stainless steel, and in particular relates to a method for annealing thick-gauge low-chromium ferritic stainless steel in a hot rolling shutter bell furnace. Background technique [0002] Low-chromium ferritic stainless steel does not contain precious metal nickel or contains less precious metal chromium, so compared with nickel-containing austenitic stainless steel, duplex steel and high-chromium ferritic stainless steel, the cost of manufacturing raw materials is low. It has certain corrosion resistance and easy processing, so low-chromium ferritic stainless steel is widely used in the manufacture of automobile industry, container, heat exchanger and other industries. For example, when choosing thick gauge stainless steel for flanges, low chromium ferritic stainless steel plate can be used as one of the alternative materials. However, in order to be suitable for flange steel, thick-gauge low-c...
Claims
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IPC IPC(8): C21D1/26C21D1/74C21D9/663C22C38/02C22C38/04C22C38/28
CPCC21D1/26C21D1/74C21D9/663C21D2211/005C22C38/001C22C38/004C22C38/02C22C38/04C22C38/28
Inventor 王志军孙铭山白晋钢郭永亮李春明
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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