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A method for producing ultra-pure ferritic stainless steel for decoration by adopting a steel coil mill

A furnace rolling mill and ultra-pure iron technology, applied in the field of ultra-pure ferritic stainless steel, can solve problems such as surface plate grain defects, reduce the finishing rolling temperature, eliminate the surface plate grain defects along the rolling direction, and promote the degree of recrystallization Effect

Active Publication Date: 2021-08-27
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing ultra-pure ferritic stainless steel for decoration by using a steel-steel rolling mill to solve the problem of surface grain defects in rolling SUS443J1 ultra-pure ferritic stainless steel by a steel-steel rolling mill

Method used

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  • A method for producing ultra-pure ferritic stainless steel for decoration by adopting a steel coil mill
  • A method for producing ultra-pure ferritic stainless steel for decoration by adopting a steel coil mill
  • A method for producing ultra-pure ferritic stainless steel for decoration by adopting a steel coil mill

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, a kind of method that adopts steel coil mill to produce decorative ultra-pure ferritic stainless steel is characterized in that comprising the following steps:

[0034] A. Smelting and continuous casting: smelting and continuous casting of SUS443J1 slab according to the conventional process of VOD-LF refining furnace, its specification is: 220mm (thickness) × 1250mm (width) × 9000mm (length), and its composition mass percentage is: C: 0.015%, Si: 0.30%, Mn: 0.40%, P: 0.02%, S: 0.003%, Ni: 0.25%, Cr: 21.5%, Cu: 0.5%, Nb: 0.1%, Ti: 0.3%, N: 0.010%, the balance is Fe and residual elements;

[0035] B. Grinding: the slab obtained in step A is ground twice with a 16# emery wheel, with a grinding depth of 2.3mm, and with a 20# emery wheel for one time, with a grinding depth of 1.0mm;

[0036] C. Heating in the heating furnace: heat the ground slab obtained in step B to 800°C in the preheating furnace, then enter the heating furnace to continue heating to 1160°C...

Embodiment 2

[0045] Embodiment 2, a method for producing decorative ultra-pure ferritic stainless steel using a steckel mill, is characterized in that it comprises the following steps:

[0046] A. Smelting and continuous casting: smelting and continuous casting of SUS443J1 slab according to the conventional process of VOD-LF refining furnace, its specification is: 220mm (thickness) × 1250mm (width) × 8000mm (length), and its composition mass percentage is: C: 0.010%, Si: 0.40%, Mn: 0.30%, P: 0.03%, S: 0.002%, Ni: 0.3%, Cr: 22.0%, Cu: 0.3%, Nb: 0.16%, Ti: 0.12%, N: 0.015%, the balance is Fe and residual elements;

[0047] B, grinding: the slab obtained in step A is ground twice with a 16# emery wheel, with a grinding depth of 2.5mm, and with a 20# grinding wheel for one time, with a grinding depth of 0.5mm;

[0048] C. Heating furnace heating: heat the ground slab obtained in step B to 750°C in the preheating furnace, then enter the heating furnace and continue heating to 1200°C, and the h...

Embodiment 3

[0056] Embodiment 3, a method for producing decorative ultra-pure ferritic stainless steel using a steckel mill, is characterized in that it comprises the following steps:

[0057] A. Smelting and continuous casting: smelting and continuous casting of SUS443J1 slab according to the conventional process of VOD-LF refining furnace, its specification is: 220mm (thickness) × 1250mm (width) × 8500mm (length), and its composition mass percentage is: C: 0.012%, Si: 0.35%, Mn: 0.20%, P: 0.01%, S: 0.002%, Ni: 0.15%, Cr: 20.5%, Cu: 0.4%, Nb: 0.12%, Ti: 0.18%, N: 0.012%, the balance is Fe and residual elements;

[0058] B, grinding: the slab obtained in step A is ground twice with a 16# emery wheel, with a grinding depth of 2.0mm, and with a 20# grinding wheel for one time, with a grinding depth of 0.8mm;

[0059] C. Heating furnace heating: heat the ground slab obtained in step B to 780°C in the preheating furnace, then enter the heating furnace and continue heating to 1180°C, and the ...

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Abstract

The invention discloses a method for producing ultra-pure ferritic stainless steel for decoration by adopting a coil rolling mill, which belongs to the field of stainless steel production and solves the problem of surface grain defects existing in ultra-pure ferritic stainless steel rolled by a coil rolling mill. The invention comprises the following steps: smelting, continuous casting; grinding; heating in a heating furnace; hot rolling rough rolling; hot rolling finish rolling; The invention aims at the characteristics of the steel-steel rolling mill, adopts reasonable rolling temperature, rolling procedure and appropriate low thermal annealing temperature, eliminates oriented grain clusters in the microstructure of cold-rolled products of traditional technology, and obtains a microstructure with randomly dispersed distribution of grain orientations , and then effectively eliminate the macroscopic surface defects of cold-rolled 2B products along the rolling direction to ensure that the product is qualified for grinding and drawing.

Description

technical field [0001] The invention belongs to the field of stainless steel production, and in particular relates to a method for producing ultra-pure ferritic stainless steel for decoration by adopting a coil rolling mill. Background technique [0002] Ultra-pure ferritic stainless steel SUS443J1 has excellent corrosion resistance due to its extremely low C and N content and the addition of a certain amount of stable elements Ti and Nb; its composition does not contain precious metal Ni, which greatly reduces its production cost. SUS443J1 is widely used in the field of architectural decoration because of its economy and high corrosion resistance. The decoration field has very strict requirements on product surface defects. When there are defects on the surface that cannot be processed by wire drawing or require multiple times of wire drawing, the promotion and use of the product will be restricted. Since there are heating furnaces on both sides of the reversible rolling m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21D8/02C22C38/02C22C38/04C22C38/42C22C38/48C22C38/50
CPCC21D8/0205C21D8/0221C21D8/0247C21D2211/005C22C33/04C22C38/001C22C38/02C22C38/04C22C38/42C22C38/48C22C38/50
Inventor 陈安忠高仁强任娟红李照国钱张信王军伟
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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