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

A technology for gear steel and molten steel, applied in the field of alloys, can solve problems such as difficulty in the form of MnS, and achieve the effects of alleviating the problem of uneven processing, facilitating uniform distribution, and improving the probability of layered precipitation

Active Publication Date: 2022-07-12
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 and preparation method and application thereof
  • Calcium-tellurium synergistic gear steel and preparation method and application thereof
  • Calcium-tellurium synergistic gear steel and 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 function 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...

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 present application provides a calcium-tellurium synergistic gear steel and a preparation method and application thereof. Calcium-tellurium synergistic gear steel, calculated by mass percentage, including: C0.40%-0.43%, Si0.23%-0.28%, Mn0.75%-0.85%, S0.01%-0.035%, P0.015 %‑0.020%, Cr1.05%‑1.15%, Mo0.19%‑0.23%, Ca0.001%‑0.007%, Te0.005%‑0.07%, and the rest are Fe and inevitable impurity elements. Preparation method of calcium-tellurium synergistic gear steel: the raw materials are subjected to converter smelting, LF refining, RH refining and continuous casting to obtain the calcium-tellurium synergistic gear steel. The calcium-tellurium synergistic gear steel provided in this application limits the deformation of manganese sulfide and increases cutting lubricity.

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, etc. 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 the parts during machining, and thus improve the tool life. The elongated sulfide will significantly reduce the lateral properties of the steel, resulting in anisotropy, and the improvement of the cutting performance is relatively limited; in comparison, the spindle-shaped sulfide is not easy to stretch and deform during hot wor...

Claims

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Application Information

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Patent Type & Authority Patents(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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