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Method for producing ultra-pure ferritic stainless steel for decoration by adopting Steckel mill

A kind of furnace coil mill, technology of ultra-pure iron

Active Publication Date: 2020-02-21
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for producing ultra-pure ferritic stainless steel for decoration by adopting Steckel mill
  • Method for producing ultra-pure ferritic stainless steel for decoration by adopting Steckel mill
  • Method for producing ultra-pure ferritic stainless steel for decoration by adopting Steckel 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 Steckel mill, and belongs to the field of stainless steel production. The problem of surface plate pattern defects existing in the ultra-pure ferritic stainless steel rolled by the Steckel mill is solved. The method comprises the following steps of smelting and continuous casting; grinding; heating by a heating furnace; hot rough rolling; hot finishing rolling; hot rolling coiling; hot annealing acid washing; cold rolling; cold annealing acid washing; and flattening. According to themethod, aiming at the characteristics of the Steckel mill, a reasonable rolling temperature and rolling schedule and a suitably low thermal annealing temperature are adopted, oriented grain clustersin the microstructure of the cold rolled product produced through a traditional process are eliminated, the microstructure that grains is in a randomly dispersed distribution is obtained, and then plate pattern defects, in the rolling direction, of the macroscopic surface of a cold rolled 2B product is effectively eliminated, so that the product grinding and drawing process is guaranteed to be qualified at a time.

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 Applications(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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