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Method for controlling form of free cutting steel sulfide by additionally adding oxide

A free-cutting steel and oxide technology, applied in the field of metallurgy, can solve problems such as uncontrollable sulfide morphology, and achieve the effects of easy sulfide recombination, saving production costs, and wide application range

Inactive Publication Date: 2019-07-26
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the core-clad feeding line sulfuration method has been widely used due to its advantages of simple operation, short sulfuration process time and low pollution, but it cannot control the morphology of the formed sulfides.

Method used

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  • Method for controlling form of free cutting steel sulfide by additionally adding oxide
  • Method for controlling form of free cutting steel sulfide by additionally adding oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Put xAl2 o 3 ·SiO2 2 (x=4~10%) The powder is cleaned with alcohol and dried in a dryer; the oxide size after ball milling is measured by a BT-2001 (wet method) laser particle size distribution analyzer, and xAl of 2 o 3 ·SiO2 2 (x=4~10%) powder; Selection purity is that 99% particle is 200 mesh iron powders, and carbon-sulfur analyzer analyzes its sulfur content and is 90ppm; Pure iron powder, manganese powder, xAl 2 o 3 ·SiO2 2 (x=4~10%) powder, Fe 2 S powder is mixed according to a certain ratio, and the mixture is pressed into a block by a hydraulic press. In the block mixture, the quality of sulfur element is controlled at 0.2% to 0.4%, and the content of oxygen element is controlled at 100 to 150ppm. The mass of sulfur element and oxygen element The ratio is 1:0.04~0.08, and the melting is carried out in a MoSi2 high temperature vertical tube furnace.

[0029] 2. The sample obtained by smelting, after inlaying, the surface of the sample is treated by conve...

Embodiment 2

[0031] 1. Put xAl 2 o 3 ·SiO2 2 (x=30~40%) The powder is washed with alcohol and dried in a dryer; the oxide size after ball milling is measured by a BT-2001 (wet method) laser particle size distribution analyzer, and xAl of 2 o 3 ·SiO2 2 (x=30~40%) powder; Selection purity is that 99% particle is 200 mesh iron powders, and carbon-sulfur analyzer analyzes its sulfur content and is 90ppm; Pure iron powder, manganese powder, xAl 2 o 3 ·SiO2 2 (x=30~40%) powder, Fe 2 S powder is mixed according to a certain ratio, and the mixture is pressed into a block by a hydraulic press. In the block mixture, the quality of sulfur element is controlled at 0.2% to 0.4%, and the content of oxygen element is controlled at 100 to 150ppm. The mass of sulfur element and oxygen element The ratio is 1:0.04~0.08, and the melting is carried out in a MoSi2 high temperature vertical tube furnace.

[0032] 2. The samples obtained by smelting are surface treated by conventional mechanical grinding a...

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Abstract

The invention belongs to the field of metallurgy and particularly relates to a method for controlling the form of free cutting steel sulfide by additionally adding oxide. The method includes the stepthat a sulfur source and low-melting-point area oxide are added into molten steel at the same time. Particularly, a sulfur line which is manufactured with a mixture of the sulfur source and the low-melting-point area oxide serving as a core material and low-carbon steel serving as a core-spun pipe is added into molten steel; or a sulfur line with the sulfur source serving as the core material andthe low-carbon steel serving as the core-spun pipe and an oxide line with the low-melting-point area oxide serving as the core material and the low-carbon steel serving as the core-spun pipe are addedinto the molten steel at the same time. The low-melting-point area oxide comprises any one or a combination of Al2O3-SiO2-MnO, CaO-Al2O3-SiO2 and Na2O-Al2O3-SiO2. By means of the method, when the sulfur line is fed, the added oxide can control separation of the sulfide, the form of the sulfide is improved, the service life of a tool is prolonged, the production cost is saved, the mechanical performance and the cutting performance of the sulfur series free cutting steel are collaboratively improved, and extremely good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for controlling the sulfide form of free-cutting steel by adding oxides. Background technique [0002] Free-cutting steel can effectively reduce cutting resistance, slow down tool wear, and improve work efficiency during the cutting process, and has been more and more widely used in the machinery industry. Sulfur-based free-cutting steel is currently the most widely used free-cutting steel. The improvement of the cutting performance of sulfur-based free-cutting steel is mainly due to the fact that the sulfide destroys the continuity of the matrix and makes the chips easy to break, and the lubricated tool reduces the tool wear. The form of sulfide has a great influence on the cutting performance and mechanical properties of the free-cutting steel greater impact. At present, there are many long strip-shaped sulfides in the free-cutting steels commonly used in the do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
CPCC21C7/0056
Inventor 李方杰郑少波李慧改曾鹏林文松
Owner SHANGHAI UNIV OF ENG SCI
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