MnCr carburized gear steel and its production method

A gear steel and carburizing technology, applied in the field of alloy structural steel, can solve the problems of increasing the production cost of steel, and achieve the effects of improving production efficiency, improving purity and good comprehensive performance.

Inactive Publication Date: 2012-06-27
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, most of the existing patents use Nb, V, Ti single or composite microalloying to refine the grains, and some even add Ni and Mo elements to improve the performance of steel. With the increasing price of raw materials, the production cost of steel is high. Amplitude increase

Method used

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  • MnCr carburized gear steel and its production method
  • MnCr carburized gear steel and its production method

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Embodiment 1-4

[0033] A MnCr carburized gear steel. UHP ultra-high power electric furnace, LF refining, VD vacuum degassing process are used for smelting, continuous casting casting billets, and rolling lumber processes to produce steel products. Embodiment 1-2 specifically illustrates how the present invention is implemented with the production process of Φ50mm steel. Embodiments 3-4 specifically illustrate how the present invention is implemented with the production process of Φ80mm steel.

[0034] The composition of steel is by mass percentage:

[0035] C: 0.25-0.30%, Si: ≤0.12%, Mn: 0.60-0.80%, Cr: 0.80-1.10%, P: ≤0.035%, S: 0.020-0.050%, Al: 0.020-0.055, [O]≤ 20ppm, the rest is Fe and unavoidable impurities.

[0036] The production process is as follows:

[0037] (1) Smelting: Electric furnace smelting is used, and the whole process of electric furnace smelting is used to create foam slag. The end point [C]=0.15-0.20%, [P]≤0.015%, [Si]=0.03-0.04%, and the content of residual element...

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Abstract

The invention relates to a MnCr carburized gear steel and its production method, the MnCr carburized gear steel comprises the following components by mass percentage: 0.25-0.30% of C, less than or equal to 0.12% of Si, 0.60-0.80% of Mn, 0.80-1.10% of Cr, less than or equal to 0.035% of P, 0.020-0.050% of S, 0.020-0.055% of Al, less than or equal to 20ppm of [O] and the balance of Fe and inevitable impurities. By using an electric furnace smelting, the end point [C] is 0.10-0.15%, [P] is less than or equal to 0.015%, [Si] is less than or equal to 0.05%, and the tapping temperature is 1630-1680DEG C. The method comprises the steps of LF refining, adjusting slag by using carbon powder; feeding aluminum line, calcium line and sulfur line; vacuum treating; soft blowing argon; continuously casting a blank, controlling the tundish temperature at 1520-1540 DEG C, and strictly controlling the casting speed according to different blank types. The isothermal temperature, heating time and rolling temperature can be strictly controlled during the rolling process; thereby a hot-rolled round steel is prepared.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a MnCr carburized gear steel and its manufacturing technology. Background technique [0002] Carburized gear steel is one of the main structural steels for automobiles. The development of its material technology directly affects the overall technical level of my country's automobile manufacturing. For a long time, China's carburized gear steel has mostly used 20CrMnTi. With the introduction of products and manufacturing technology, many high-strength carburized gear steels of foreign brands also entered. MnCr gear steel is a high-standard car gear steel imported by our country at the same time as the German car production line. All of them are produced according to the standards of German Volkswagen Enterprises. It is the most technically demanding and most difficult to produce among the imported steel grades. It is mainly used for the gears of Audi, Je...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/18C21C5/54C21C7/06B22D11/115B22D11/16C21D8/00
Inventor 郑艳梁娜张利平范黎明卢乃双孙永喜张海霞吴德发
Owner LAIWU IRON & STEEL GRP
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