Unlock instant, AI-driven research and patent intelligence for your innovation.

Control method for polishing inclusion pit defect on chromium-containing steel surface

A control method and surface polishing technology, which is applied in the field of iron and steel metallurgy, can solve problems such as the shedding of inclusions, affecting the surface gloss of chromium-containing steel, and polishing defects, so as to achieve good surface gloss, avoid polishing pit defects, and high reflectivity Effect

Active Publication Date: 2021-07-23
UNIV OF SCI & TECH BEIJING +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel matrix is ​​metal, and the inclusions are non-metallic. During the surface polishing process of chromium-containing stainless steel, due to the gap between the inclusions and the steel matrix, the inclusions are easy to fall off from the steel matrix and form pits on the steel surface, resulting in polishing defects. , which seriously affects the surface gloss of chromium-containing steel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control method for polishing inclusion pit defect on chromium-containing steel surface
  • Control method for polishing inclusion pit defect on chromium-containing steel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the refining process of chromium-containing steel with a chromium content of 10%, the aluminum and calcium content in alloys and auxiliary materials are strictly controlled, and low-aluminum and low-calcium ferroalloys with a maximum aluminum content of 0.04% and a maximum calcium content of 0.03% in ferroalloys are used and Excipients, use CaO-SiO with an alkalinity of 1.65 2 -MgO refining slag, controlling inclusions in molten steel to SiO 2 -MnO; the silicon content in the steel is controlled to 0.28%, and the cooling process of the secondary cooling of the crystallizer first weak cooling and then strong cooling enhances the residence time of the continuous casting slab at a temperature of 1000 ° C to 1400 ° C, and the cooling rate of the weak cooling is less than 0.5°C / s, the cooling rate of strong cooling is greater than 2°C / s, and the heating and holding time is 3 hours at a high temperature of 1260°C, and the surface zigzag MnO-Cr is finally obtained 2 o 3 T...

Embodiment 2

[0039]In the refining process of chromium-containing steel with a chromium content of 10%, the aluminum and calcium content in alloys and auxiliary materials are strictly controlled, and low-aluminum and low-calcium ferroalloys with a maximum aluminum content of 0.04% and a maximum calcium content of 0.03% in ferroalloys are used and Excipients, use CaO-SiO with an alkalinity of 1.7 2 -MgO refining slag, controlling inclusions in molten steel to SiO 2 -MnO; the silicon content in the steel is controlled to 0.28%, and the secondary cooling through the crystallizer is weak first, and the continuous casting slab is strengthened at a temperature of 1400 ° C. The cooling rate of the weak cooling is less than 0.5 ° C / s, and the cooling rate of the strong cooling is greater than 2 ℃ / s, the residence time, through the high temperature heating treatment at 1260 ℃, the heating and holding time is 2 hours, and the surface zigzag MnO-Cr is finally obtained 2 o 3 The formation of spine...

Embodiment 3

[0041] In the refining process of chromium-containing steel with a chromium content of 10%, the aluminum and calcium content in alloys and auxiliary materials are strictly controlled, and low-aluminum and low-calcium ferroalloys with a maximum aluminum content of 0.04% and a maximum calcium content of 0.03% in ferroalloys are used and Excipients, use CaO-SiO with an alkalinity of 1.5 2 -MgO refining slag, controlling inclusions in molten steel to SiO 2 -MnO; the silicon content in the steel is controlled to 0.28%, and the cooling process of the secondary cooling of the crystallizer first weak cooling and then strong cooling enhances the residence time of the continuous casting slab at a temperature of 1000 ° C, and the cooling rate of the weak cooling is less than 0.5 ° C / s, the cooling rate of strong cooling is greater than 2°C / s, and the heating and holding time is 2.5 hours at a high temperature of 1260°C, and the surface zigzag MnO-Cr is finally obtained 2 o 3 The form...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of ferrous metallurgy, and relates to a control method for a surface polishing inclusion pit defect on chromium-containing steel. The control method comprises the following steps: in a chromium-containing refining process, reducing silicon-manganese to dioxide molten steel, controlling content of aluminum and calcium in alloy and auxiliary materials, using low-aluminum low-calcium ferrous alloy with aluminum content and calcium content lower than 0.05% and auxiliary materials, controlling content of aluminum in steel to be smaller than 0.001%, and controlling content of calcium in steel to be smaller than 0.0003%; using refined slag with alkalinity of 1.5-1.7; controlling the content of silicon in steel to be smaller than 0.4%, strongly cooling after weakly cooling, strengthening diffusion and mass transfer around a steel matrix and inclusion of chromium, silicon and manganese elements, promoting generation of sawtooth-shaped spinel inclusion on the surface of the product after treatment, thereby avoiding the surface polishing pit defect caused by the inclusion. The level of the stainless steel surface reaches BA level, the surface glossiness is extremely good and a reflection rate is very high, so that the surface is just like a mirror surface.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for controlling pit defects of inclusions in surface polishing of chromium-containing steel. Background technique [0002] The composition, shape, size, and distribution of non-metallic inclusions in steel directly affect the surface quality and product performance of stainless steel. Chromium-containing steel represented by stainless steel is widely used in aerospace, special equipment, marine development, automobile manufacturing, medical equipment, household appliances and other fields, and puts forward high requirements for its corrosion resistance, high temperature resistance and polishing performance. The steel matrix is ​​metal, and the inclusions are non-metallic. During the surface polishing process of chromium-containing stainless steel, due to the gap between the inclusions and the steel matrix, the inclusions are easy to fall off from the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06B22D11/16C21C7/00C21D1/00C21D6/00
CPCC21C7/06B22D11/16C21D1/00C21D6/002C21C7/0006C21D2211/005Y02P10/20
Inventor 任英张立峰杨文黄庆周潘料庭黄日清姬建民张华黄学忠黄磊杨东谢明耀区增微任强王祎高小勇
Owner UNIV OF SCI & TECH BEIJING