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Process for producing ferritic stainless steel

A production method and technology of stainless steel, applied in rolling mill control device, heat treatment process control, metal rolling, etc., can solve problems such as serious wrinkle streaks and affect product quality, and achieve recrystallization, production cost reduction, and wrinkle elimination. The effect of streak defects

Active Publication Date: 2007-08-01
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, cancellation of annealing after hot rolling and direct cold rolling will lead to serious wrinkling and streaks on the surface of the final product (see Figure 2, Figure 4A and Figure 5A), which greatly affects product quality

Method used

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  • Process for producing ferritic stainless steel
  • Process for producing ferritic stainless steel
  • Process for producing ferritic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Described technological process and parameter are:

[0037] 1) The drawing temperature ET is controlled at 1200°C, the rough rolling exit temperature RDT is controlled at 1100°C, the finish rolling entrance temperature FET is controlled at 1050°C, the finish rolling exit temperature FDT is controlled at 950°C, and the coiling temperature CT is controlled at 800°C;

[0038] 2) The thickness of the cast slab is 200mm, set by the roll gap of the rolling mill, the rough rolling exit thickness is controlled at 50mm, the finish rolling exit thickness is controlled at 2mm-10mm, and the cumulative reduction rate of rough rolling is controlled at 75%;

[0039] 3) Improve the rough rolling process, adjust the relative reduction distribution ratio of the 7 passes, increase the relative reduction rate of the subsequent pass, and distribute the load backward, and control the ratio of the relative reduction rate of the initial pass to the final pass at 0.18 , the relative reduction r...

Embodiment 2

[0047] Described technological process and parameter are:

[0048] 1) The drawing temperature ET is controlled at 1100°C, the rough rolling exit temperature RDT is controlled at 980°C, the finish rolling entrance temperature FET is controlled at 940°C, the finish rolling exit temperature FDT is controlled at 870°C, and the coiling temperature CT is controlled at 700°C;

[0049] 2) The thickness of the cast slab is 200mm, set by the roll gap of the rolling mill, the rough rolling exit thickness is controlled at 45mm, the finish rolling exit thickness is controlled at 2mm-10mm, and the cumulative reduction rate of rough rolling is controlled at 77.5%;

[0050] 3) Improve the rough rolling process, adjust the relative reduction distribution ratio of the 7 passes, increase the relative reduction ratio of the subsequent pass, and distribute the load backward, and control the ratio of the relative reduction ratio of the initial pass to the final pass at 0.24 , the relative reduction...

Embodiment 3

[0058] Described technological process and parameter are:

[0059] 1) The drawing temperature ET is controlled at 1050°C, the rough rolling exit temperature RDT is controlled at 930°C, the finish rolling entrance temperature FET is controlled at 900°C, the finish rolling exit temperature FDT is controlled at 830°C, and the coiling temperature CT is controlled at 650°C;

[0060] 2) The thickness of the cast slab is 200mm, set by the roll gap of the rolling mill, the thickness of the exit of rough rolling is controlled at 35mm, the thickness of the exit of finish rolling is controlled at 2mm-10mm, and the cumulative reduction rate of rough rolling is controlled at 82.5%;

[0061] 3) Improve the rough rolling process, adjust the relative reduction distribution ratio of the 7 passes, increase the relative reduction rate of the subsequent pass, and distribute the load backward, and control the ratio of the relative reduction rate of the initial pass to the final pass at 0.35 , the ...

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Abstract

The invention relates to a modified method for preparing ferrite non-corrodible steel, comprising heating casting blank, phosphorus removing, roughing down, phosphorus removing, fine rolling, cooling, spiraling, acid washing and cold reducing. The heating temperature is controlled between 1000- 1200 Deg. C; the outlet for roughing down is controlled between 900- 1100 Deg. C, and the relative pressing rate for roughing down is distributed backwards to increase break deformation energy restoration and promote break recrystallization; increase swing steel of middle roller way of 10- 100s between roughing down and fine rolling to ensure the time and condition for middle blank recrystallization; the temperature for fine rolling inlet is controlled between 850- 1050 Deg. C, for outlet the temperature is controlled between 750- 950 Deg. C, the relative pressing rate for fine rolling is distributed backwards to increase break deformation energy restoration and promote break recrystallization; the break after rolling is cooled to 600- 800 Deg. C for batching.

Description

technical field [0001] The invention relates to a production method of stainless steel, in particular to a production method of ferritic stainless steel. Background technique [0002] In recent years, since the cost of ferritic stainless steel is much lower than that of Ni-containing austenitic stainless steel, and it can replace the use of austenitic stainless steel in some fields and performance, it is widely used in daily utensils, food, decoration, and automobile exhaust. Tubes, elevator panels and other fields have broad application prospects. [0003] At present, the traditional production process of ferritic stainless steel is as follows: the slab is heated, dephosphorized, rough rolled, dephosphorized, finished rolled, laminar cooling, coiled, annealed, pickled, and cold rolled to produce ferrite. Stainless steel. Due to the inherent characteristics of ferritic stainless steel itself, it is difficult to achieve good recrystallization during the hot rolling process....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D11/00B21B37/00B21B37/74B21B37/56B21B37/58B21C47/02
Inventor 余海峰王伟明毛惠刚田勇
Owner BAOSTEEL DESHENG STAINLESS STEEL
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