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A locomotive wheel and content technology, applied in the field of locomotives, can solve problems such as high cost and poor service performance, and achieve the effects of suppressing deformation recrystallization, polygon problems, improving rolling contact fatigue resistance, and improving crack initiation resistance.
Pending Publication Date: 2021-11-19
ZHIBO LUCCHINI RAILWAY EQUIP +1
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[0004] Aiming at the problems of poor service performance and high cost of current locomotive wheel materials, the invention provides a material for locomotive wheels
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[0022] Preparation of materials for locomotive wheels:
[0023] Step 1, using steel scrap as raw material, smelting in a 50-ton ultra-high-power electric arc furnace, controlling the temperature of molten steel to 1600°C, and controlling the contents of C, P, Si, Mn and other elements within the range required in Table 1;
[0024] Step 2, use the LF furnace to carry out deep desulfurization, deep deoxidation, and removal of inclusions through the refining slag, so that the content of S element is controlled within the range required in Table 1, and the content of non-metallic inclusions is controlled within the range required in Table 2; deoxidation, desulfurization At the end, fine-tune the micro-alloy composition, adjust Cr by adding high-carbon ferrochromium, and adjust the content of alloy elements by adding alloy materials such as nickel plate, copper plate, ferromolybdenum, ferro-vanadium, ferro-niobium, ferro-titanium, and aluminum; after fine-tuning, you can pass The w...
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Abstract
The invention belongs to the field of locomotives, and discloses a material for locomotive wheels. The material comprises the following microalloy components of, in percentage by mass, 0.57 to 0.70 of C, 0.50 to 1.10 of Mn, less than or equal to 0.40 of Ni, less than or equal to 0.06 of Ti, less than or equal to 0.06 of V, and less than or equal to 0.30 of Cr. Compared with ER8 and ER9 materials which are frequently used in China at present, the material for the locomotive wheels has high yield strength, tensile strength, plastic deformation resistance and rolling contact fatigue resistance, the hardness of a rim is improved to 265 HBW or above under the same condition, in addition, microalloy elements Nb and Ti are added into steel, the microalloy element V is combined for use, on one hand, deformation recrystallization of austenite can be inhibited and growth of crystal grains of the austenite can be prevented in the hot working process, on the other hand, the precipitation strengthening effect of Nb, V and Ti can be exerted through strain induced precipitation of carbon-nitrogen compounds of the austenite, so that the crack initiation resistance of the material is improved, crack propagation is delayed, the service stability of the whole life cycle is promoted, and the service life and the operation mileage are prolonged.
Description
technical field [0001] The invention belongs to the field of locomotives, and in particular relates to a material for locomotive wheels. Background technique [0002] The railway locomotive is the traction unit of passenger and freight trains, and it is the key equipment that determines the railway transportation capacity and efficiency, and ensures the safe and efficient operation of the national economic artery. The locomotive wheel plays the role of transmitting traction power, is one of the key components of the locomotive, and is also an important component that has the most severe service conditions in the locomotive and is related to the safety of train operation. Compared with vehicles, the operating conditions of locomotive wheels in my country have the characteristics of high traction and heavy axle, which are manifested in high slip, high shear stress and thermal-mechanical load during braking and traction. In recent years, with the development of speed-up and he...
Claims
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