A kind of ultra-pure high-temperature fine-grained gear steel, manufacturing method and application thereof
A gear steel, fine-grained technology, applied to belts/chains/gears, components with teeth, hoisting devices, etc., can solve problems such as difficult mass production, difficult promotion, and high production costs
Active Publication Date: 2021-06-29
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Problems solved by technology
The steel produced by this patent is difficult to mass-produce due to the use of high-demand equipment and technology, and the production cost is high, so it is difficult to promote
Method used
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[0036] The present invention will be further described in detail below in conjunction with the examples. The examples are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0037] The specific production process of gear steel is: 100t electric furnace—outside furnace refining—VD vacuum degassing—300×340mm continuous casting slab—casting slab reheating—rolling—slow cooling of steel—finishing and grinding. details as follows
[0038] Electric furnace smelting (primary smelting)
[0039] 1) The pretreated molten iron accounts for 30-60% of the raw materials into the furnace, and the rest is selected high-quality steel scrap;
[0040] 2) Control of key points in the electric furnace smelting and tapping process: Carry out end-point tapping carbon control on the electric furnace, [C] end point not less than 0.05%, [P] 0.015%; partially alloy in the ladle, and quantitatively add synthetic slag and The deoxidize...
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Abstract
The invention relates to an ultra-pure high-temperature fine-grained gear steel and a manufacturing method thereof. The chemical composition includes C: 0.15-0.21%, Si: ≤0.12%, Mn: 1.00-1.30%, Cr: 1.00-1.30%, S: 0.010‑0.025%, P≤0.025%, Ni: 0.70‑1.00%, Mo: 0.02~0.10%, B: 0.0020‑0.0040%, Cu≤0.20%, Al≤0.05%, Ca≤0.0005%, Ti≤0.003% , N: 0.0080~0.016%, and N=(0.80~1.0)×(0.5%Al+0.7%B) where the element symbol represents the content of the element, and the balance is Fe and unavoidable impurities; the characteristics of oxides in steel When the value reaches K1≤10, Al, B, and N added in proportion to the steel can be fully combined, and a large number of fine particles are produced in the matrix, so that the grain size of the matrix is still above grade 6 after high-temperature carburizing treatment above 960 °C .
Description
technical field [0001] The invention belongs to the technical field of iron-based special steel smelting, and in particular relates to a gear steel and its application as a gear processing material for an electric vehicle reducer. Background technique [0002] The electric vehicle reducer is a precision mechanical component, its function is to reduce the speed of the motor rotating at high speed through it, increase the torque, so as to realize the high-speed driving of the car. The gear used in the reducer is subjected to a large impact force due to the large torque transmitted by the high-speed motor, so the gear material is required to have higher fatigue strength, and the purity has a significant impact on the fatigue life, so the purity of the gear steel for electric vehicles There are higher requirements to meet the impact of high motor speed on gears. [0003] Due to the consideration of factors such as environmental protection, energy saving, improvement of producti...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/54C22C38/42C22C38/06C22C33/04C21C7/06C21C7/10F16H55/06
CPCC21C7/0056C21C7/0087C21C7/06C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/54F16H55/06
Inventor 曹红福黄镇白云惠世杰李国忠许晓红吴小林狄梦龙卢明霞孙鸿平孟羽廖书全芦莎张丽娜高亮徐光琴赵福来
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD