Manufacturing method for medium chrome ferrite stainless steel

A manufacturing method, stainless steel technology, which is applied in the field of stainless steel manufacturing, can solve problems such as complex manufacturing processes, and achieve the effects of simplifying the process flow, enhancing cost competitiveness, and reducing costs

Inactive Publication Date: 2014-08-06
BAOSTEEL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The final products obtained by such a production process are mostly NO.2D (uneven after pickling) or NO.2B (flat after pickling), and the manufacturing process is relatively complicated.

Method used

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  • Manufacturing method for medium chrome ferrite stainless steel
  • Manufacturing method for medium chrome ferrite stainless steel
  • Manufacturing method for medium chrome ferrite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Stainless steel manufacturing method step of the present invention is as follows:

[0039] 1. Hot-rolled black coils are hot-rolled at a finishing temperature of 860°C and coiled at a temperature of 750°C;

[0040] 2. After coiling, the hot coil directly enters the heat preservation pit for heat preservation. The temperature of the hot coil entering the heat preservation pit is greater than 750°C, and the slow cooling rate of the steel coil is less than 20°C / h. When the temperature of the steel coil is lower than 200°C, leave the pit and air cool to room temperature ;

[0041] 3. Hot-rolled black coils do not undergo bell furnace annealing or continuous annealing, but are directly pickled on the continuous pickling line to remove surface oxide scale;

[0042] 4. After pickling, the steel coil is cold-rolled; the total cold-rolling reduction rate is controlled at 50%, and the continuous rolling method is adopted on a five-stand continuous rolling unit, and the single-co...

Embodiment 2-4

[0048] The specific process parameters are shown in Table 4, and the final product performance is shown in Table 5.

[0049] Table 4 embodiment 1-5 and the process parameter of comparative example

[0050]

[0051] The product performance of table 5 embodiment 1-5 and comparative example

[0052]

[0053]

[0054] As can be seen from the table, the mechanical performance indexes of Examples 1-5 are equivalent to those of Comparative Examples 1-1 and 2-1, and the yield strength, tensile strength and elongation are all the same as those of the cold-rolled finished product of medium chromium ferritic stainless steel of Comparative Examples level is comparable.

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Abstract

The invention provides a manufacturing method for medium chrome ferrite stainless steel. The method consists of the processes of: smelting, continuous casting, hot rolling, coiling, acid pickling, cold rolling, cold coiling annealing and pickling. In the hot rolling process, subjecting a hot rolled black coil to hot rolling at a finishing rolling temperature of 860-1000DEG C, and conducting coiling at 750-850DEG C; after coiling, subjecting the hot coil to heat preservation in a heat preservation pit directly, controlling the temperature of the hot coil sent into the heat preservation pit greater than 750DEG C, slowly cooling a steel coil at a cooling speed of less than 20DEG C/h, taking the steel coil out of the pit when the temperature of the steel coil is lower than 200DEG C, and performing air cooling to room temperature; subjecting the hot rolled black coil to acid pickling directly on a continuous acid pickling line, and removing the surface oxide scale; after acid pickling, conducting cold rolling on the steel coil; carrying out recrystallization and continuous annealing on cold-rolled strip steel; and performing acid pickling to remove the surface oxide scale, and at the same time conducting passivation treatment on the strip steel. The method provided by the invention omits the process of hot coil bell-type furnace annealing, simplifies the process flow, and strengthens the cost competitiveness. Compared with single-stand reversible rolling, cold continuous rolling has the advantages of high production efficiency and low cost.

Description

technical field [0001] The invention relates to the field of stainless steel manufacturing, in particular to a method for manufacturing medium chromium ferritic stainless steel. Background technique [0002] Medium chromium ferritic stainless steel usually refers to ferritic stainless steel with a chromium content of 16-18%, and the representative steel grade is 430. In addition to general corrosion resistance, medium chromium ferritic stainless steel also has good local corrosion resistance such as chloride stress corrosion resistance and pitting corrosion resistance. Medium chromium ferritic stainless steel is the most widely used ferritic stainless steel with good corrosion resistance, and most of its properties are similar to 304. Compared with austenitic stainless steel, medium chromium ferritic stainless steel has high strength, low cold work hardening tendency, large thermal conductivity, small linear expansion coefficient, and good comprehensive performance. It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02
Inventor 王伟明李步明余海峰高丽莉
Owner BAOSTEEL STAINLESS STEEL
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