Hardenablity-retaining gear steel and preparation method thereof
A gear steel and hardenability technology, which is applied in the field of metallurgical manufacturing, can solve the problems of unsatisfactory hardenability control of 20CrMnTiH gear steel, and achieve the effects of alleviating the shortage of metal resources, reducing brittleness, and reducing production costs
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Embodiment 1
[0056] A preparation method of hardenability-retaining gear steel, comprising the following steps:
[0057] S1. Primary smelting of the converter: add 976.32kg of molten iron, 85.13kg of scrap steel, and 13.54kg of pig iron into the converter; the temperature of the molten iron entering the converter is 1250°C, P: 0.150%, and slag content: 0.5%; oxygen is supplied by bottom blowing, Oxygen pressure 0.8MPa, nitrogen-argon switching time 8min; slagging basicity controlled at 3.0;
[0058] Control of the end point of steel discharge: high-strength supplementary blowing, C is controlled at 0.08%; P: 0.015%, and the tapping temperature is 1620°C;
[0059] S2. Ladle deoxidation alloying: meet the end point control requirements, turnover ladle, bottom blowing is smooth, no slag tapping; add aluminum block, the amount of aluminum block is 0.7kg / ton of steel; add artificial graphite 9.9kg / ton of steel in order, Aluminum bar 2.1kg / ton steel, silicon-manganese alloy 12.10kg / ton steel, f...
Embodiment 2
[0074] A preparation method of hardenability-retaining gear steel, comprising the following steps:
[0075] S1. Primary smelting of the converter: add 974.88kg of molten iron, 85.17kg of scrap steel, and 13.54kg of pig iron into the converter; the temperature of the molten iron entering the converter is 1270°C, P: 0.130%, and slag content: 0.4%; oxygen is supplied by bottom blowing, Oxygen pressure 0.82MPa, nitrogen-argon switching time 9min; slagging basicity controlled at 3.5;
[0076]Control of the end point of steel discharge: high-strength supplementary blowing, C is controlled at 0.12%; P: 0.012%, and the tapping temperature is 1650°C;
[0077] S2. Ladle deoxidation alloying: meet the end point control requirements, turnover ladle, bottom blowing is smooth, no slag tapping; add aluminum block, the amount of aluminum block is 1.2kg / ton of steel; add artificial graphite 10.1kg / ton of steel in order, Aluminum bar 1.9kg / ton steel, silicon-manganese alloy 10.50kg / ton steel, ...
Embodiment 3
[0092] A preparation method of hardenability-retaining gear steel, comprising the following steps:
[0093] S1. Primary smelting of the converter: add 977.59kg of molten iron, 84.89kg of scrap steel, and 13.54kg of pig iron into the converter; the temperature of the molten iron entering the converter is 1320°C, P: 0.110%, and slag content: 0.45%; oxygen is supplied by bottom blowing, Oxygen pressure 0.81MPa, nitrogen-argon switching time 8.5min; slagging basicity controlled at 3.2;
[0094] Control of the end point of steel discharge: high-strength supplementary blowing, C is controlled at 0.08%; P: 0.013%, and the tapping temperature is 1630°C;
[0095] S2. Ladle deoxidation alloying: meet the end point control requirements, turnover ladle, bottom blowing is smooth, no slag tapping; add aluminum block, the amount of aluminum block is 1.0kg / ton steel; add artificial graphite 10kg / ton steel, aluminum in order Bar 2.05kg / ton steel, silicon-manganese alloy 13.45kg / ton steel, fer...
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