Manufacturing method of high wearproof gear steel

A manufacturing method and technology of gear steel, applied in the field of manufacture of wear-resistant steel, can solve the problems of segregation, silicon grain boundary oxidation, deterioration of gear performance, etc.

Active Publication Date: 2020-07-10
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon is an easily oxidizable element, and it is easy to segregate at the grain boundary. In the traditional carburizin

Method used

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  • Manufacturing method of high wearproof gear steel
  • Manufacturing method of high wearproof gear steel
  • Manufacturing method of high wearproof gear steel

Examples

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Effect test

Embodiment 1—3

[0030] Carry out the manufacture of gear steel according to the following steps:

[0031] 1) Smelting: 100 tons of iron ladle is used for pretreatment of molten iron, and then 100 tons of steelmaking furnace is smelted and refined outside the furnace. During the refining process, silicon carbide and aluminum wires are used for strong deoxidation. During refining, the main chemical elements are precisely regulated. Steel The liquid undergoes vacuum degassing to remove H and adjust N to the target range. The biggest function of vacuum degassing is to remove light impurities and purify molten steel.

[0032] 2) Continuous casting: continuous casting into a 240mm×240mm square billet, and control the superheating degree of the tundish at 10-40°C. In order to control the segregation of materials, advanced end electromagnetic stirring and continuous casting light reduction advanced equipment and technology are used in continuous casting. Gained continuous casting slab chemical composi...

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Abstract

The invention relates to a manufacturing method of high wearproof gear steel. The manufacturing method comprises the following steps: 1, smelting, wherein molten steel comprises the following components: 0.15-0.60% of C, 0.50-1.3% of Si, 0.50-1.2% of Mn, 0.60-1.5% of Cr, equal to or less than 0.030% of P, equal to or less than 0.035% of S, 0.010-0.050% of Al, 0.008-0.025% of N and the balance of Fe; 2, pouring: pouring molten steel into steel billets; 3, rolling: after heating the steel billets, rolling the steel billets in a single-phase region at the initial rolling temperature of 980-1100 DEG C, sequentially carrying out intermediate rolling, pre finish rolling and finish rolling, during the rolling process, controlling cooling, after intermediate rolling, carrying out spraying coolingon the steel billets, after pre finish rolling, carrying out spraying cooling on the steel billets once more, then, carrying out KOCKS finish rolling, and controlling the finishing temperature to be 780-900 DEG C to obtain an unstable austenite; and 4, cooling: carrying out blast cooling the steel billets on a cooling bed, controlling the average cooling rate to be 40-80 DEG C/min and the final cooling temperature to be 300-480 DEG C, after final cooling, carrying out air cooling on the material to the room temperature, and in the cooling process, converting the austenite into ferrite and pearlite. After carburizing, quenching and tempering, the rolled steel has excellent wear resistance.

Description

technical field [0001] The invention relates to a method for manufacturing wear-resistant steel, in particular to a method for manufacturing wear-resistant steel with relatively high silicon content. Background technique [0002] Recently, with the development needs of industries such as automobiles, improving the design wear life of gears, increasing the stability and life of operating equipment, thereby improving efficiency and reducing costs has become one of the important development directions of the industry. From the point of view of gear design, it is required that the surface has high hardness to improve wear resistance, and the core has certain toughness. Gear steel is usually designed with medium and low carbon to ensure the toughness of the core, and one or more alloying elements of Cr, Mo, V, B are added to improve the hardenability of the material. And during the subsequent heat treatment, the surface of the material is carburized (actually, carburizing, nitri...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D8/00C21D6/00C21D9/00C22C38/02C22C38/04C22C38/06C22C38/18
CPCC22C33/04C21D8/005C21D9/0081C21D6/002C21D6/005C21D6/008C22C38/02C22C38/04C22C38/002C22C38/06C22C38/001C22C38/18C21D2211/005C21D2211/009
Inventor 顾铁陶佳伟黄镇白云许晓红颉军定李英
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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