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

Method for controlling inclusions on surface layer of low-carbon enamel steel casting blank

A control method and enamelled steel technology, which is applied in the field of iron and steel metallurgy, can solve problems such as difficult removal, high rate of product downgrading and judgment, and restrictions on product quality, yield rate and order fulfillment of steel plants.

Active Publication Date: 2022-02-18
MAANSHAN IRON & STEEL CO LTD
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Steelmaking adopts low-carbon aluminum-killed steel process to produce enamelled steel, and at the same time adds titanium alloying, so a large amount of Al is produced in molten steel 2 o 3 , TiN and TiOx-Al 2 o 3 Endogenous inclusions and coarse slag-like Oxides (main elements are Ca, Al, Mg, Si, etc.) foreign inclusions will gather on the surface of the slab during the continuous casting production process, and in the subsequent rolling process It is difficult to remove, so that in the continuous rolling process of cold rolling, the occurrence rate of surface defects in enamelled steel cold-rolled sheets is relatively high, and the rate of product degradation and judgment remains high, which seriously restricts the product quality, yield rate and order fulfillment of steel plants

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
  • Method for controlling inclusions on surface layer of low-carbon enamel steel casting blank
  • Method for controlling inclusions on surface layer of low-carbon enamel steel casting blank
  • Method for controlling inclusions on surface layer of low-carbon enamel steel casting blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] When producing enamelled steel, the steelmaking plant adopts the technological process of molten iron pretreatment→top-bottom combined blowing converter→alloy fine-tuning station→RH vacuum refining furnace to obtain qualified enamelled steel molten steel. The continuous casting tundish adopts large ladle protective casing + argon blowing protection pouring; the crystallizer adopts submerged nozzle, the flow rate of argon blowing is controlled at 6.5NL / min, the alkalinity of mold slag is 1.10, and the water flow rates on the wide and narrow sides of the crystallizer are respectively 4900L / min and 500L / min, the inlet water temperature is 27°C, and the specific water volume of the secondary cooling water is 1.32L / kg. The slab is cleaned by hot flame with a cleaning degree of 5.0mm on the narrow side and a cleaning depth of 1.8mm on the wide side. The distribution trend of inclusions in the produced enamel steel slab is as follows: figure 1 As shown, the physical mass is as...

Embodiment 2

[0025] When producing enamelled steel, the steelmaking plant adopts the technological process of molten iron pretreatment→top-bottom combined blowing converter→alloy fine-tuning station→RH vacuum refining furnace to obtain qualified enamelled steel molten steel. The continuous casting tundish adopts ladle protection casing + argon blowing protection pouring; the crystallizer adopts submerged nozzle, the flow rate of argon blowing is controlled at 7.0NL / min, the alkalinity of mold slag is 1.10, and the water flow rates on the wide and narrow sides of the crystallizer are respectively 5100L / min and 520L / min, the inlet water temperature is 25°C, and the specific water volume of the secondary cooling water is 1.38L / kg. The slab is cleaned by hot flame with a cleaning degree of 5.8mm on the narrow side and a cleaning depth of 2.0mm on the wide side. The quality of the enamel steel slab produced is similar to that of Example 1.

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

PropertyMeasurementUnit
Area ratioaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for controlling inclusions on the surface layer of a low-carbon enamel steel casting blank, which comprises the following steps of: adopting a strength mode for a crystallizer and secondary cooling, respectively controlling the water flows of the wide surface and the narrow surface of the crystallizer to be 4500-5500L / min and 450-550L / min, controlling the water inlet temperature to be within 35 DEG C, and controlling the specific water flow of secondary cooling water to be 1.30-1.40 L / kg; performing thermal flame cleaning on the casting blank; under the condition that existing molten iron pretreatment, a top-bottom combined blown converter, an alloy fine adjustment station and an RH vacuum refining process are not changed, the inclusion is controlled to be separated out on the surface layer of the casting blank by adjusting the continuous casting crystallizer and the secondary cooling strength, and the inclusion in the surface layer is removed through surface flame cleaning; and qualified enamel steel continuous casting billets can be produced economically and efficiently.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for controlling inclusions in the surface layer of low-carbon enamel steel slabs. Background technique [0002] Low-carbon enamel steel plates are widely used in people's daily life, from kitchen utensils, sanitary ware, household appliances to refrigeration appliances, architectural lighting and so on. And it is widely used in light industry, household appliances, metallurgy, chemical industry, construction and other industries to make kitchen utensils, sanitary ware, barbecue ovens, water heater inner tanks, building decorative panels, chemical reaction tanks and so on. As people's requirements for enamel products are increasing day by day, the demand for enameled steel sheets with ultra-deep drawing performance and excellent enamelling performance is very urgent. [0003] Steelmaking adopts low-carbon aluminum-killed steel process to pro...

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
IPC IPC(8): B22D11/22B22D11/16C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16
CPCB22D11/22B22D11/225B22D11/001B22D11/16C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16Y02P10/20
Inventor 程锁平刘国平张乔英毛鸣
Owner MAANSHAN IRON & STEEL CO LTD