22CrMoH hardenability-maintaining gear steel and preparation method thereof
A technology of gear steel and hardenability, which is applied in the field of 22CrMoH gear steel with guaranteed hardenability and its preparation, can solve the problems of reduced bite accuracy and increased gear grinding amount, so as to reduce the grinding amount and improve the bite accuracy , Increase the effect of fatigue life and purity
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Embodiment 1
[0042] Preparation method of 22CrMoH solder gear steel, including steps:
[0043] S1. Transforcement: Iron water, scrap and pig iron in the converter; the iron water entering the converter, oxygenation, oxygen pressure is 1.0MPa, the oxygen pressure is 8 minutes; the slag alkalin is controlled at 3.0;
[0044] Playing steel end point control: high pulling, C is controlled at 0.08%, P: 0.015%, out steel temperature 1640 ° C;
[0045] S2. Milk bag de-oxygenation: reach the end point control requirements, normal weekly flux, clean, baking, bottom blowing, medium repair, small repair weeks 3 times can be put into use, no slag out steel, joining each ton Aluminum block 1.5kg; in order sequentially in the order of steel water 1kg, silicon-manganese 13.45kg, silicon iron 1.21kg, low carbon chrome iron 9.2kg, molybdenum iron 6.73kg, and add lime in the process of steel bag Sand is washed, and the amount of lime added to the steel water is 3kg;
[0046] S3.LF refining: The LF furnace in th...
Embodiment 2
[0059] S1. Transforcement: Iron water, scrap and pig iron in the converter; the iron water entering the converter, oxygenation, oxygen pressure 1.1MPa, the whole process is 3.8;
[0060] Plateing steel end point control: high pulling, C is controlled at 0.09%, P: 0.013%, steel temperature 1650 ° C;
[0061] S2. Milk bag de-oxygenation: reach the end point control requirements, normal weekly flux, clean, baking, bottom blowing, medium repair, small repair bag 4 times can be put into use, no slag out steel, joining each ton Aluminum block 1.0kg; in sequence, the artificial graphite 1kg is added in sequence, silicon-manganese 13.45kg, silicon 1.21kg, low carbon chrome iron 9.2kg, molybdenum iron 6.73kg, and add lime in the steel bag during the steel bag Sand is washed, and the amount of lime added to the steel water is 3kg;
[0062] S3.LF refining: The LF furnace inbound temperature is 1550 ° C, the hanging bag temperature is 1630 ° C, the liquid phase temperature is 1510 ° C; the bo...
Embodiment 3
[0074] S1. Transforcement: Add iron water, scrap and pig iron to the converter; the iron entering the converter, oxygenation, oxygen pressure 1.2MPa, the whole process is 8.3 min; the slag alkalin is controlled at 3.15;
[0075] Plateing steel end point control: high pulling, C control is 0.1%, P: 0.012%, and steel temperature 1665 ° C;
[0076] S2. Milk bag de-oxygenation: reach the end point control requirements, normal weekly flux, clean, baking, bottom blowing, medium repair, small repair bag 4 times can be put into use, no slag out steel, joining each ton Aluminum block 1.15kg; in sequence sequentially in the order of artificial graphite 1kg, silicon-manganese 13.45kg, silicon 1.21kg, low carbon chrome iron 9.2kg, molybdenum iron 6.73kg, and add lime in the steel bag during the steel bag Sand is washed, and the amount of lime added to the steel water is 3kg;
[0077] S3.LF refining: The LF furnace inbound temperature is 1555 ° C, the hanging bag temperature is 1628 ° C, the l...
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