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

Active Publication Date: 2021-06-22
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the unsatisfactory hardenability control of the existing 20CrMnTiH gear steel, this application provides a gear steel with hardenability and its preparation method

Method used

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  • Hardenablity-retaining gear steel and preparation method thereof
  • Hardenablity-retaining gear steel and preparation method thereof
  • Hardenablity-retaining gear steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses hardenablity-retaining gear steel and a preparation method thereof. The hardenablity-retaining gear steel mainly comprises the following components in percentage by mass: 0.18-0.21% of C, 0.20-0.28% of Si, 0.75-1.05% of Mn, 0.95-1.25% of Cr, 0.035-0.055% of Ti, 0.020-0.035% of Al, 0.0008-0.0030% of B, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 20 ppm of T[O], less than or equal to 80 ppm of T[N], less than or equal to 0.10% of Ni, less than or equal to 0.20% of Cu, less than or equal to 0.10% of Mo, and the balance of Fe. The gear steel with a narrow hardenability band and an excellent fatigue life is prepared by controlling primary melting and strengthening refining, large ladle submerged nozzle argon blowing, catalyzer slag protection, plasma tundish heating and constant-temperature constant-pull-speed casting, and compound electromagnetic stirring through converter, dual-refining and continuous casting processes.

Description

technical field [0001] The application relates to the technical field of metallurgical manufacturing, in particular to a hardenability-preserving gear steel and a preparation method thereof. Background technique [0002] Gear products are the key basic parts of the machinery industry, and the main transmission components of most complete sets of machinery are gear transmissions. my country's gear industry is market-oriented, and has formed two major systems of vehicle gears and industrial gears in accordance with market rules. With the development of the automobile industry, the market demand for vehicle gears is increasing day by day. [0003] Under service conditions, vehicle gears must not only bear huge alternating loads, but also bear huge impact loads. Therefore, the gears are required not only to have good strength, toughness, wear resistance, but also to have the characteristics of small deformation, high precision, and low noise. , which puts forward high requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/28C22C38/32C22C38/42C22C38/44C22C38/50C22C38/54B22D11/111B22D11/115C21C7/00C21C7/072C21C7/10C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C22C38/20C22C38/22C22C38/42C22C38/44C22C38/50C22C38/54C22C33/04C21C7/10C21C7/072C21C7/0087B22D11/111B22D11/115
Inventor 陈丰冉富包石磊刘和家陈中明金鑫杨子江院文强许明杰王庆军程吉东
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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