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Composite low-carbon free-cutting steel and production method thereof

A technology of free-cutting steel and production method, which is applied in the field of low-carbon composite free-cutting steel and its production, can solve the problems of low-carbon free-cutting steel such as poor mechanical properties and stability, limited application range, and high production difficulty, and achieve The effect of reducing laziness, reducing anisotropy, and improving overall performance

Active Publication Date: 2018-02-16
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technology that the sulfur-based free-cutting steel contains a large amount of S elements in the prior art, which increases the hot brittleness of the steel, so defects such as splitting, falling blocks, and surface cracks are prone to occur during the rolling process, and the production is difficult. problems, as well as the poor mechanical properties and stability of low-carbon free-cutting steels that greatly restrict its application range, a composite low-carbon free-cutting steel and its production method are provided

Method used

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  • Composite low-carbon free-cutting steel and production method thereof
  • Composite low-carbon free-cutting steel and production method thereof
  • Composite low-carbon free-cutting steel and production method thereof

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Effect test

Embodiment 1

[0034] The process route of EAF-CONVERTER electric converter smelting→LF furnace refining→CCM continuous casting is adopted to produce low-carbon free-cutting steel.

[0035] Composition control of smelted products: C: 0.13~0.16%, Si: ≤0.05%, Mn: 0.90~1.05%, P: 0.035~0.050%, S: 0.15~0.20%, Cr: 0.20~0.28%, Cu: 0.10~ 0.15%, B: 0.0040~0.0055%, N: 0.014~0.018%, Al: ≤0.005%, O: 0.0045~0.0075%, the balance is Fe.

[0036] The electric converter uses molten iron, pig iron and high-quality scrap steel as raw materials. The total loading is controlled at 109 tons, the ratio of molten iron is 89%, the amount of pig iron added is 5.5 tons, and the rest is high-quality scrap. End-point composition C: 0.07%, P: 0.016%, tapping temperature T: 1661°C, tapping volume 93.5 tons, using eccentric bottom tapping, no slagging; the tapping process is followed by adding appropriate amounts of aluminum, iron, silicon manganese, Low-carbon ferromanganese, low-carbon ferrochrome, ferrophosphorus, ferrosulf...

Embodiment 2

[0042] The process route of EAF-CONVERTER electric converter smelting→LF furnace refining→CCM continuous casting is adopted to produce low-carbon free-cutting steel.

[0043] Composition control of smelted products: C: 0.13~0.16%, Si: ≤0.05%, Mn: 0.90~1.05%, P: 0.035~0.050%, S: 0.15~0.20%, Cr: 0.20~0.28%, Cu: 0.10~ 0.15%, B: ≤0.0030%, N: ≤0.0120%, Al: ≤0.005%, O: 0.0045~0.0075%, the balance is Fe.

[0044] The electric converter uses molten iron, pig iron and high-quality scrap steel as raw materials. The total loading is controlled at 108 tons, the molten iron ratio is 91%, the pig iron addition is 5.1 tons, and the rest is high-quality scrap steel. End-point composition C: 0.07%, P: 0.016%, tapping temperature T: 1659°C, tapping volume 93.6 tons, eccentric bottom tapping, slagging is strictly prohibited; the tapping process is followed by adding appropriate amounts of aluminum, iron, silicon manganese, Low-carbon ferromanganese, low-carbon ferrochrome, ferrophosphorus, ferrosulf...

Embodiment 3

[0050] The process route of EAF-CONVERTER electric converter smelting→LF furnace refining→CCM continuous casting is adopted to produce low-carbon free-cutting steel.

[0051] Composition control of smelted products: C: 0.13~0.16%, Si: ≤0.05%, Mn: 0.90~1.05%, P: 0.035~0.050%, S: 0.20~0.35%, Cr: 0.20~0.28%, Cu: 0.10~ 0.15%, B: ≤0.0030%, N: ≤0.0120%, Al: ≤0.005%, O: 0.0080~0.0120%, the balance is Fe.

[0052] The electric converter uses molten iron, pig iron and high-quality scrap steel as raw materials. The total loading is controlled at 109 tons, the ratio of molten iron is 86%, the amount of pig iron added is 4.5 tons, and the rest is high-quality scrap. End-point composition C: 0.06%, P: 0.013%, tapping temperature T: 1659°C, tapping volume 93.8 tons, eccentric bottom tapping, slagging is strictly prohibited; the tapping process is followed by adding appropriate amounts of aluminum iron, silicon manganese, Low-carbon ferromanganese, low-carbon ferrochrome, ferrophosphorus, ferros...

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Abstract

The invention relates to composite low-carbon free-cutting steel with excellent mechanical performance and a production method thereof. Through adjustment for the dosages and proportions of key elements, and control and optimization for a refining slagging process, continuous casting cooling conditions and a rolling temperature, efficient and stable production for the low-carbon free-cutting steelis realized, and effective control for sulfides is realized while the wear of silicon oxides with high hardness and aluminium oxides with high hardness on a tool; and through introduction for elementB, and control for N / B proportion, the adding time of the element B, and cooling separation for the element B, the positive effect of a BN-class graphite structure and the positive effect of the composite inclusion of the BN-class graphite structure for the oxides and sulfides are adequately exerted, the cutting machining performance of the low-carbon free-cutting steel is further improved, the dependence of the cutting performance on a sulfur content is reduced to a certain extent, and the anisotropy of the mechanical performance of materials is reduced, and through adding for elements Cu, Cr and the like, simultaneous consideration and balance for the low-carbon steel in the aspects of free-cutting performance and mechanical performance are effectively realized.

Description

Technical field [0001] The invention relates to a production method of free-cutting steel in the metallurgical industry, in particular to a production method of low-carbon free-cutting steel. Background technique [0002] Since free-cutting steel has the advantages of prolonging tool life, reducing cutting resistance, improving the surface finish of machining, and easily removing chips during the cutting process, it has been more and more widely used in the automotive and machining industries. For the performance of free-cutting steel The research is also increasing. At present, free-cutting steels mainly include sulfur-based, lead-based, calcium-based, and composite tellurium, selenium, and titanium-based types. Among them, sulfur-based free-cutting steels are the most widely used. In this type of free-cutting steel, low-carbon sulfur Due to its good cutting performance and chip breaking performance, the demand for free-cutting steel has increased significantly with the develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/20C22C38/32C22C38/06C21C7/06C21D8/02C21C7/00
CPCC21C7/00C21C7/0006C21C7/06C21D8/0226C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/32C22C38/60
Inventor 高宇波
Owner ZENITH STEEL GROUP CORP
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