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Method for reducing content of boron in 20CrMnTiH gear steel

A technology for gear steel and boron content is applied in the field of reducing boron content in 20CrMnTiH gear steel, which can solve the problems of increased operating costs, narrow hardenability, and complicated operation, and can improve the problem of irregular gear deformation and stabilize hardening. the effect of reducing the content of elements

Inactive Publication Date: 2018-12-07
CHENGDE JIANLONG SPECIAL STEEL
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Problems solved by technology

[0005] At present, some domestic special steel companies have realized the influence of trace boron (B) elements on the hardenability of 20CrMnTiH. They generally control the trace boron elements in steel by controlling the composition of tundish materials and cored wires, and then assist with Composition segregation research to achieve the goal of narrow hardenability, but the operation of the above method is relatively complicated, which increases the operating cost of the enterprise

Method used

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Embodiment 1

[0027] 20CrMnTiH gear steel was prepared by blast furnace hot metal pretreatment, converter smelting, LF furnace refining, VD vacuum furnace refining and continuous casting.

[0028] The composition of the smelted finished product is controlled as follows: C: 0.17-0.22%, Si: 0.20-0.30%, Mn: 0.80-1.10%, Cr: 1.00-1.25%, B≤0.0003%, Cu≤0.20%, Ni≤0.30%, Al : 0.015-0.025%, P: ≤0.020%, S: ≤0.010%.

[0029] Converter smelting: The total load of converter is controlled at 72 tons, the ratio of molten iron is 87.5%, the amount of scrap steel added is 4.5 tons, and the rest is self-produced molten iron. Tapping end point composition C: 0.06%, P: 0.012%, tapping temperature T: 1655°C, tapping amount 68 tons; adding 60kg aluminum block for deoxidation, adding 450kg medium carbon ferromanganese, 500kg low carbon ferromanganese, 1150kg of medium carbon ferrochrome, 320kg of high carbon ferrochrome and 200kg of ferrosilicon are alloyed after the furnace, and 500kg of lime and 240kg of high a...

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Abstract

The invention provides a method for reducing the content of boron in 20CrMnTiH gear steel. The method comprises the steps that in the converter smelting stage, low-carbon ferromanganese and mid-carbonferromanganese alloy can be used as a manganese additive, and in the LF stage, refining slag with the Al2O3 mass percent being 20 to 25% is used for refining. On the basis of not increasing production cost, through material formula control and refining slag series component adjusting, the step of adding a slagging ball is omitted, the content of B is reduced, the B is controlled to be smaller than or equal to 2ppm, and hardenability of the 20CrMnTiH gear steel is stabilized. The method is adopted, meanwhile, added value of the steel is increased, the technical reference is provided for an enterprise capable of smelting 20CrMnTiH gear steel, the problem that after heat treatment by a customer, gear deformation is not regular is effectively solved, and the good economic benefits and application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of alloy smelting, in particular to a method for reducing the boron content in 20CrMnTiH gear steel. Background technique [0002] Gear steel is one of the key materials with high requirements in the special alloy steel used in automobiles, railways, ships, and construction machinery, and is a manufacturing material for core components that ensure safety. Hardenability is one of the important performance indicators of gear steel. It is mainly to ensure the hardness of the core of gears of different sizes, and it is beneficial to control the heat treatment deformation of gears. The control of the hardenability and hardenability bandwidth of gear steel mainly depends on the combination of various chemical elements during the smelting process, the narrow range control of the composition and the content of residual elements. [0003] 20CrMnTiH is a large amount of hardenable gear steel used in China. It has goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/076C22C33/06
CPCC21C5/28C21C7/076C22C33/06Y02P10/20
Inventor 刘增平李诗斌崔红军张大伟
Owner CHENGDE JIANLONG SPECIAL STEEL
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