A kind of low-carbon selenium-containing free-cutting steel for instruments and meters and its manufacturing method

A technology of free-cutting steel and instrumentation, applied in the field of free-cutting steel, can solve the problems of unfavorable suppression, limited improvement effect, and reduced production efficiency, and achieve advanced cutting performance and surface quality level, good processing surface roughness, cutting performance Improved effect

Active Publication Date: 2022-05-13
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the key to improving the cutting performance of free-cutting steel is to control the form and distribution of sulfides. CN102676955A discloses "a high-sulfur free-cutting steel with excellent cutting performance", which can improve the free-cutting performance of steel, but the price of tellurium is relatively high. It is not conducive to cost reduction, and the production efficiency is greatly reduced compared with continuous casting.
CN104404386A discloses "a preparation method of ferroalloy". The ferroalloy is high-carbon, which has limited improvement on the easy-cutting performance of the material
By improving the refining process, Zhang Liwu and others realized the improvement of the sulfide form in the steel and reduced the probability and size of brittle inclusions. However, from the analysis indicators before and after the process adjustment, the improvement effect is limited, and the method mentioned The measure of increasing the proportion of MgO in the slag is unfavorable for the suppression of hard and harmful inclusions of magnesium aluminum spinel

Method used

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  • A kind of low-carbon selenium-containing free-cutting steel for instruments and meters and its manufacturing method
  • A kind of low-carbon selenium-containing free-cutting steel for instruments and meters and its manufacturing method
  • A kind of low-carbon selenium-containing free-cutting steel for instruments and meters and its manufacturing method

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Experimental program
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Effect test

preparation example Construction

[0034] A method for preparing low-carbon selenium-containing free-cutting steel for instrumentation, specifically comprising the following steps:

[0035] 1) Converter smelting: Converter molten iron does not desulfurize, but only decarburizes and phosphorus; deoxidizes when 1 / 5~1 / 4 of the steel is tapped, and the total oxygen content is controlled at 40~60ppm. In the smelting of the present invention, the total oxygen content must be controlled within this range, which is the key to the nucleation thermodynamic environment for the formation and precipitation of selenium and sulfur elements in the present invention. If the total oxygen content exceeds this range, the precipitation effect of selenium will be weakened. When the total oxygen is lower than When the concentration is 55ppm, the selenium element cannot be diffusely distributed. When the concentration is higher than 75ppm, the precipitation grows rapidly and the sulfide cannot be wrapped. This is one of the innovations...

Embodiment

[0041] The chemical composition of the embodiment of the present invention is shown in Table 1; the manufacturing process parameters of the corresponding embodiment steel and comparative steel are shown in Table 2; the slab end cracking, surface scarring, bubble defects and relative cutting coefficient Kr and chips of the corresponding embodiment The types are shown in Table 3.

[0042] The composition wt% of table 1 embodiment steel of the present invention, comparative example steel

[0043]

[0044]

[0045] Table 2 The manufacturing process parameters of the embodiment steel of the present invention and comparative example steel

[0046]

[0047] Table 3 Statistics of slab end cracking, surface scarring, bubble defects, relative cutting coefficient Kr and chip types

[0048]

[0049] The present invention is created by the above-mentioned technology, evaluates the continuous casting slab hot rolling continuity and stability of different composition designs (se...

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Abstract

The invention relates to the technical field of free-cutting steel, in particular to a low-carbon selenium-containing free-cutting steel for instruments and meters and a manufacturing method thereof. It consists of the following chemical components in weight percentage: C: 0.01% to 0.10%, Si: 0.01% to 0.10%, Mn: 0.50% to 1.50%, P: 0.01% to 0.10%, S: 0.25% to 0.35% %, Se: 0.18% to 0.30%, O: 0.0040% to 0.0060%, the ratio of selenium to sulfur Se / S is 0.2 to 2, the ratio of oxygen to selenium to O / Se is 0.016 to 0.17, and the balance is iron and unavoidable impurities. The present invention reduces cutting resistance and cutting heat in the cutting process through a certain ratio of manganese and selenium and a certain combination of selenium and sulfur, protects the cutting tool, lubricates the cutting tool at the same time, and obtains good machining surface roughness.

Description

technical field [0001] The invention relates to the technical field of free-cutting steel, in particular to a low-carbon selenium-containing free-cutting steel for instruments and meters and a manufacturing method thereof. Background technique [0002] With the development of the automobile industry, the degree of automation of each process has been continuously improved, and the cutting process has also been automated due to the adoption of NC lathes and CNC machine tools. In this case, the chip handling of steel has become a bottleneck affecting cutting processing. Although equipped with advanced cutting machines, the chips are wound on the tool and the workpiece, which requires manual handling, which is time-consuming and labor-intensive. Therefore, free-cutting steels with good chip handling properties are widely used. [0003] According to the classification of composition, free-cutting steel is mainly divided into two major systems: sulfur-based and lead-based. The cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C33/06C21D8/00
CPCC22C38/02C22C38/04C22C38/002C22C38/60C22C33/06C21D8/005
Inventor 王冬刘祥王宏亮安慧竹尹一徐曦任玉辉
Owner ANGANG STEEL CO LTD
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