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

A method for controlling sulfide inclusions in sulfur-containing steel

A technology of sulfur-containing steel and sulfide, applied in the field of metallurgy, can solve the problems of completely removing sulfide inclusions, unable to prevent sulfide deformation, etc., to achieve the effect of promoting aggregation and floating, and improving the purity of molten steel

Active Publication Date: 2021-07-09
石钢京诚装备技术有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process can only partially remove inclusions in molten steel, and cannot fundamentally completely remove sulfide inclusions in molten steel, and cannot prevent the deformation of sulfides during rolling, and has limited ability to improve the purity of molten steel and the quality of 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
  • A method for controlling sulfide inclusions in sulfur-containing steel
  • A method for controlling sulfide inclusions in sulfur-containing steel
  • A method for controlling sulfide inclusions in sulfur-containing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Table 1 shows the chemical composition and mass percentage of the sulfur-containing rolled steel in this example.

[0030] The method for controlling sulfide inclusions in sulfur-containing steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting processes. The specific process steps are as follows:

[0031] (1) Converter smelting process: Converter tapping C: 0.09%, P: 0.013%, steel core aluminum 2.3kg / t steel, silicon-manganese alloy 5.5kg / t steel, high-carbon ferromanganese 3.2kg / t are added in sequence during the tapping process t steel, white ash 5.3㎏ / t steel, refining slag 4.2㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.55㎏ / t steel after tapping;

[0032] (2) LF refining process: LF in place Al: 0.025%, LF refining process lime dosage 3㎏ / t steel, white slag retention time 22min, LF refining time 65min; LF refining process silicon carbide dosage 4.2㎏ / t steel, alum...

Embodiment 2

[0038] Table 1 shows the chemical composition and mass percentage of the sulfur-containing rolled steel in this example.

[0039] The method for controlling sulfide inclusions in sulfur-containing steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting processes. The specific process steps are as follows:

[0040] (1) Converter smelting process: Converter tapping C: 0.11%, P: 0.010%, steel core aluminum 2.7kg / t steel, silicon-manganese alloy 6.1kg / t steel, high-carbon ferromanganese 4.0kg / t are added in sequence during the tapping process t steel, white ash 5.8㎏ / t steel, refining slag 4.5㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.62㎏ / t steel after tapping;

[0041] (2) LF refining process: LF in place Al: 0.031%, LF refining process lime dosage 3.5kg / t steel, white slag retention time 24min, LF refining time 62min; LF refining process silicon carbide dosage 4.5kg / t steel, ...

Embodiment 3

[0047] Table 1 shows the chemical composition and mass percentage of the sulfur-containing rolled steel in this example.

[0048] The method for controlling sulfide inclusions in sulfur-containing steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting processes. The specific process steps are as follows:

[0049] (1) Converter smelting process: Converter tapping C: 0.13%, P: 0.014%, steel core aluminum 2.5kg / t steel, silicon-manganese alloy 6.4kg / t steel, high-carbon ferromanganese 4.3kg / t are added in sequence during the tapping process t steel, white ash 6.3㎏ / t steel, refining slag 4.8㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.52㎏ / t steel after tapping;

[0050] (2) LF refining process: LF in place Al: 0.028%, LF refining process lime dosage 4.1㎏ / t steel, white slag retention time 21min, LF refining time 61min; LF refining process silicon carbide dosage 4.9㎏ / t steel, al...

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
yield strengthaaaaaaaaaa
crystal sizeaaaaaaaaaa
reduction of areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for controlling sulfide inclusions in sulfur-containing steel. The method comprises converter smelting, LF refining, VD vacuum treatment and continuous casting processes. In the present invention, calcium treatment is performed after LF refining and before VD vacuum treatment; sufficient slag washing and stirring are carried out during VD vacuum treatment to promote the accumulation of inclusions to grow up and float, and can remove most of the calcium-aluminate inclusions in molten steel, VD Feed the sulfur wire after breaking through to form composite sulfide inclusions, which can further promote the accumulation and floating of inclusions. The method of the present invention improves the purity of molten steel, and can control high-magnification non-metallic sulfides of sulfur-containing steel rolled products, the grades of fine and coarse inclusions of class A are ≤ 2.0 respectively, and the grades of fine and coarse inclusions of class B are respectively ≤ 1.5, and C Class D inclusions of fine and coarse grades are ≤0.5 respectively, D-type inclusions of fine and coarse grades are respectively ≤1.5; control sulfur-containing rolled steel S: 0.020‑0.040%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling sulfide inclusions in sulfur-containing steel. Background technique [0002] Sulfur-containing steel refers to a steel type that adds a certain amount of sulfur during the smelting process, and the w(S) of the finished product is controlled at 0.020-0.050%. There are a large number of sulfide plastic inclusions mainly composed of MnS in sulfur-containing steel, which can act as a source of stress concentration, making the product easy to break chips during cutting and improving the cutting performance of the product. At the same time, it can also lubricate the cutter, reduce the wear of the cutter and prolong the service life of the cutter. However, the sulfide inclusions in sulfur-containing steel are generally distributed in clusters and unevenly distributed, and are easily deformed along the rolling direction during the rolling process,...

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 Patents(China)
IPC IPC(8): C21C7/06C21C7/00C21C7/064C21C7/10B22D11/111C22C38/02C22C38/04C22C38/06C22C38/42
CPCB22D11/111C21C7/0006C21C7/06C21C7/064C21C7/10C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42
Inventor 宋平魏巍杨锋功刘奇
Owner 石钢京诚装备技术有限公司