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A Control Method for Narrow Hardenability Bandwidth of Gear Steel
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A control method, a technology of hardenability, applied in the field of gear steel
Active Publication Date: 2019-05-31
CENT IRON & STEEL RES INST
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[0004] At present, my country's GB / T5216-2014 has requirements for hardenability. Except for some steel types, the hardenability bandwidth at J5 and J9 is required to be ≤15HRC (HRC is the hardness unit). The automobile industry has stricter requirements for hardenability bandwidth than the national standard. , but only limited to bandwidth ≤ 7HRC
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[0020] Below through embodiment, the specific implementation method of the present invention is further described.
[0021] Taking Cr-Ni-Mo series gear steel as an example, its target composition is controlled as follows:
[0023] According to the target composition control of the steel grade, select the data of 10 furnaces in which C is controlled within the range of 0.19% to 0.21% in the production of the steel grade, and the C content is respectively: 0.191%, 0.192%, 0.195%, 0.197%, 0.199%, 0.199%, 0.203%, 0.205%, 0.207%, 0.210%.
[0024] According to the composition data of 10 heats of steel and the actual test results of hardenability, the calculation formula of hardenability was optimized, and the optimized calculation formula was obtained. On the basis of the optimized formula, calculate the upper and lower line components of C, Si, Mn, Cr, Ni, Mo...
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Abstract
The invention discloses a control method for narrow hardenability bandwidth of gear steel, and belongs to the technical field of gear steel. Accordring to the method, a calculation formula for the hardenability is optimized by adopting production data so as to obtain the calculation parameters suitable for the type of the gear steel, then the upper limit and the lower limit of the components of the elements of C, Si, Mn, Cr, Ni, Mo, Ti and B which influence the hardenability are calculated according to the optimized calculation formula, the hardenability bandwidth at J5, J9, J11 and J13 is required to be 3.5HRC or less, the range of the obtained components is compared with the deviation rage of the components, namely, delta C is smaller than or equal to + / -0.01%, delta Si is less than or equal to + / -0.02%, delta Mn is less than or equal to + / -0.02%, delta Cr is less than or equal to + / -0.01%, delta Ni is less than or equal to + / -0.01%, delta Mo is less than or equal to + / -0.01%, deltaTi is less than or equal to + / -0.01%, delta Al is less than or equal to + / -0.01%, delta B is less than or equal to + / -0.005%, delta S is smaller than or equal to + / -0.002%, finally the narrowest control range is determined as the component control range of the gear steel with the narrow hardenability bandwidth requirement, pouring of low degree of superheat of 10-20 DEG C is adopted, the heating temperature fluctuation of a continuous casting blank is guaranteed to be less than or equal to + / -7 DEG C, the heat preservation time fluctuation is guaranteed to be less than or equal to + / -5 minutes, and therefore a gear steel bar with the hardenability bandwidth of 4HRC or less is obtained.
Description
technical field [0001] The invention belongs to the technical field of gear steel, and in particular provides a method for controlling the narrow hardenability bandwidth of gear steel; it is suitable for the steel used for the main and driven gears of the gearboxes of passenger cars and commercial vehicles, and can also be used for other large Steel for gear parts of instruments. Background technique [0002] With the development of my country's iron and steel material technology and industrial transformation and upgrading, high-quality metal materials are no longer the only pursuit goals, but while meeting high-quality requirements, each product must ensure the stability and consistency of quality, especially in the automotive industry. The overall quality level of my country's automobile gearboxes is not as good as that of foreign countries, mainly due to poor consistency of materials. In gear part production, material consistency can have a serious impact on carburized de...
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