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A kind of nb, ti composite microalloying high temperature carburizing gear steel

A high-temperature carburizing and micro-alloying technology, which is applied in the field of alloy steel, can solve the problems of long carburizing time and low carburizing temperature, and achieve the effects of shortening carburizing time, increasing carburizing temperature and reducing production costs

Active Publication Date: 2016-06-29
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of low carburizing temperature and long carburizing time when traditional gear steel is used to make gears

Method used

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  • A kind of nb, ti composite microalloying high temperature carburizing gear steel
  • A kind of nb, ti composite microalloying high temperature carburizing gear steel
  • A kind of nb, ti composite microalloying high temperature carburizing gear steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention steel and the comparison steel were subjected to simulated carburizing and quenching tests. The simulated carburizing and quenching process was as follows: heat preservation at 950°C, 1000°C, 1050°C and 1100°C for 1 hour and 6 hours respectively, and then water quenching, such as Figure 5 Shown in embodiment 1. Its characteristic is that after the set temperature is reached, the test sample is put into the furnace. Then evaluate its austenite grain size according to the standard GB / T6394-2002, and the results are shown in Table 2. The austenite grain size of the two steel types of the present invention can be kept above grade 8.0 when the temperature is kept at 1000°C for 1 hour and 6 hours, and no mixed crystal phenomenon is found. However, when the comparison steel was kept at 1000°C for 1 hour, the austenite grains grew abnormally and mixed crystals occurred. It can be seen that the carburizing temperature can be significantly increased by adding Nb....

Embodiment 2

[0030]The invention steel and the comparison steel were subjected to simulated carburizing and quenching tests. The simulated carburizing and quenching process was as follows: heat preservation at 1000°C, 1050°C and 1100°C for 1 hour and 6 hours respectively, and then water quenching, such as Figure 5 Shown in embodiment 2. Its characteristic is that the temperature of the sample rises with the furnace, and it is kept at 800°C for 1 hour, and then heated to the set carburizing temperature to keep it warm. Then evaluate its austenite grain size according to the standard GB / T6394-2002, and the results are shown in Table 3. Comparing Example 1 and Example 2, it can be seen that the grain coarsening temperature of the inventive steel and the comparative steel both increase with the heating of the furnace and the heat preservation at 800°C.

[0031] Table 1 The chemical composition (wt%) of steel of the present invention and comparative steel

[0032] furnace number

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Abstract

The invention relates to Nb and Ti composite micro-alloyed high-temperature carburized gear steel, and belongs to the technical field of alloy steel. The gear steel comprises the chemical components of, by mass: 0.17-0.22% of C, 0.20-0.35% of Si, 0.9-1.10% of Mn, 1.05-1.30% of Cr, 0.02-0.06% of Ti, 0.02-0.06% of Nb, 0.015-0.035% of Al, no more than 0.025% of P, 0.020-0.035% of S, and balance of Fe and inevitable impurities. The steel has the advantages that: through controlling the contents of Nb and Ti alloy elements, the carburization temperature of a current gear can be improved, gear carburization time can be reduced, and gear production cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, in particular to a kind of Nb, Ti composite micro-alloyed high-temperature carburizing gear steel. Background technique [0002] At present, the carburizing temperature of gears commonly used in China is generally not higher than 930 °C. Foreign countries have begun to use high-temperature carburizing processes higher than 930°C to produce gears. Germany and other countries have been able to manufacture carburizing furnaces with a rated temperature of 1250°C to achieve high-temperature carburizing processes for gears. Some domestic automobile manufacturers have also made meaningful progress in this regard. try. [0003] After the carburizing temperature is increased, the austenite grains of the gear steel will appear mixed crystals and coarse grains, which will affect the strength and precision of the gears, and make the gears unusable due to heat treatment deformation and scrapped. This is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28
Inventor 崔京玉柳洋波陈京生佟倩丁宁马跃王立峰
Owner SHOUGANG CORPORATION
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