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Calcium-tellurium synergistic gear steel as well as preparation method and application thereof

A technology of gear steel and molten steel, applied in the field of alloys, can solve problems such as difficult MnS forms, achieve the effects of alleviating the problem of uneven processing, simple operation, and high cost

Active Publication Date: 2022-05-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of precisely controlling a small amount of Mn and S in steel, it is difficult to control the form of MnS in steel.

Method used

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  • Calcium-tellurium synergistic gear steel as well as preparation method and application thereof
  • Calcium-tellurium synergistic gear steel as well as preparation method and application thereof
  • Calcium-tellurium synergistic gear steel as well as preparation method and application thereof

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preparation example Construction

[0046] The application also provides a method for preparing the described calcium-tellurium synergistic gear steel, comprising:

[0047] The raw materials are subjected to converter smelting, LF refining, RH refining and continuous casting to obtain the calcium-tellurium synergistic gear steel.

[0048] The function of converter smelting: adjust the temperature of molten steel, decarburize and dephosphorize, and control the C and P of the end point within the target value range.

[0049] The function of LF furnace refining: adjust the oxygen content in the molten steel, adjust the composition of the molten steel, and control the content of sulfur and tellurium in the molten steel within the target value range.

[0050] The role of RH furnace refining: adjust the composition of molten steel and control the content of calcium in the molten steel within the target value range.

[0051] The role of continuous casting: the production process of continuously casting the refined mol...

Embodiment 1

[0074] This embodiment provides a calcium-tellurium synergistically treated gear steel, the composition (wt%) of which is: C: 0.41%, Si: 0.25%, Mn: 0.78%, S: 0.02%, P: 0.018%, Cr: 1.08%, Mo: 0.20%, Ca: 0.002%, Te: 0.01%, and the rest are Fe and inevitable impurity elements. where [Ca] / ω[S]: 0.1, ω[Te] / ω[S]: 0.5.

[0075] The gear steel adopts the process flow of converter smelting → LF refining → RH refining → continuous casting, as follows:

[0076] Converter smelting: the content of Si in the molten iron is 0.60%, the content of P is 0.11%, and the amount of slag is 0.48%. Pay attention to the residual elements of molten iron and molten steel before and during production to ensure that the standard requirements are met. High tension blowing is adopted to control the composition of tapping: C: 0.08%, P: 0.008%. When tapping, add manganese silicon to the ladle: 7.5kg / t, high carbon ferrochromium Cr54C7.2: 14.5kg / t, and ferromolybdenum: 3.1kg / t; the amount of alloy is adjust...

Embodiment 2

[0082] This embodiment provides a calcium-tellurium synergistically treated gear steel, the composition (wt%) of which is: C: 0.41%, Si: 0.25%, Mn: 0.78%, S: 0.02%, P: 0.018%, Cr: 1.08%, Mo: 0.20%, Ca: 0.003%, Te: 0.02%, and the rest are Fe and inevitable impurity elements. where [Ca] / ω[S]: 0.15, ω[Te] / ω[S]: 1.

[0083] The gear steel adopts the process flow of converter smelting → LF refining → RH refining → continuous casting, as follows:

[0084] Converter smelting: the content of Si in the molten iron is 0.60%, the content of P is 0.11%, and the amount of slag is 0.48%. Pay attention to the residual elements of molten iron and molten steel before and during production to ensure that the standard requirements are met. High tension blowing is adopted to control the composition of tapping: C: 0.08%, P: 0.008%. When tapping, add manganese silicon to the ladle: 7.5kg / t, high carbon ferrochromium Cr54C7.2: 14.5kg / t, and ferromolybdenum: 3.1kg / t; the amount of alloy is adjusted ...

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Abstract

The invention provides calcium-tellurium synergistic gear steel as well as a preparation method and application thereof. The calcium-tellurium synergistic gear steel is prepared from the following components in percentage by mass: 0.40 percent to 0.43 percent of C, 0.23 percent to 0.28 percent of Si, 0.75 percent to 0.85 percent of Mn, 0.01 percent to 0.035 percent of S, 0.015 percent to 0.020 percent of P, 1.05 percent to 1.15 percent of Cr, 0.19 percent to 0.23 percent of Mo, 0.001 percent to 0.007 percent of Ca, 0.005 percent to 0.07 percent of Te and the balance of Fe and inevitable impurity elements. The preparation method of the calcium-tellurium synergistic gear steel comprises the following steps: smelting raw materials in a converter, refining in an LF (ladle furnace), refining in an RH (Ruhrstahl Heraeus) and continuously casting to obtain the calcium-tellurium synergistic gear steel. According to the calcium-tellurium synergistic gear steel provided by the invention, the deformation of manganese sulfide is limited, and the cutting lubricity is improved.

Description

technical field [0001] The present application relates to the field of alloys, in particular to a calcium-tellurium synergistic gear steel and a preparation method and application thereof. Background technique [0002] As an important mechanical component in automobile transmission structure, gear has the characteristics of high toughness, good wear resistance, stable and good hardenability and so on. The forming process of gears includes forging, cutting and heat treatment, which requires gear steel to have good processing properties. After a certain amount of sulfur is added to the steel, it can play a lubricating role, reduce the cutting resistance of parts during machining, and thus improve tool life. The elongated sulfide will obviously reduce the lateral properties of the steel, resulting in anisotropy, and the improvement of the cutting performance is relatively limited. The performance degradation is small, and it is an ideal sulfide form. However, because it is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/60C21C7/00C21C7/072C21C7/076C21C7/10C22C33/04
CPCC22C38/02C22C38/04C22C38/22C22C38/60C22C38/002C22C33/04C21C7/0006C21C7/072C21C7/10C21C7/0056C21C7/076Y02P10/20
Inventor 刘威杨树峰车智超李京社刘宇航宋朝琦
Owner UNIV OF SCI & TECH BEIJING
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