Mold casting method for hollow axle steel of high-speed passenger train
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A hollow axle and high-speed railway technology, which is applied in the field of die casting of steel for high-speed railway passenger car hollow axles
Active Publication Date: 2013-04-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0003] The existing method of die-casting steel for hollow axles of high-speed railway passenger cars is to use a single 5.8-8.4-ton ingot to die-cast a steel ingot at a superheat of 60-70°C, and to p
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Embodiment 1
[0022] In this embodiment, the amount of molten steel is 50t, the liquidus is 1500°C, and the mass percentage of the chemical composition of the molten steel is:
[0023] C 0.27; Si 0.35; Mn 0.75; P 0.005; S 0.001; Cr 1.11;
[0024] Ni 0.25; Mo 0.28; V 0.05; Al 0.015; Cu 0.13; Ti 0.003;
[0025] N 0.0045; H 0.00005; 00.0010; the rest are Fe and unavoidable impurities.
[0026] The steps of this embodiment are:
[0027] 1. The temperature of the ingot mold before casting is 53°C.
[0028] 2. Ingot type 5.8t, 2 disks, 4 ingot molds for each disk, the inside of the mold is cleaned before casting; the ingot mold is purged with argon, the tube is inserted into each disk, and the flow rate of 260L / min is used to blow argon gas 3.5 Minutes; 12Kg of mold flux is added to each tube.
[0029] 3. The temperature of the molten steel before pouring is 1535°C (the superheat of the molten steel is 35°C).
[0030] 4. Before pouring, the ladle is covered with a cover, and the cap is cover...
Embodiment 2
[0034] In this embodiment, the amount of molten steel is 160t, the liquidus is 1500°C, and the mass percent of the chemical composition of the molten steel is:
[0035] C 0.28; Si 0.36; Mn 0.75; P 0.003; S 0.001; Cr 1.11;
[0036] Ni 0.26; Mo 0.27; V 0.05; Al 0.017; Cu 0.13; Ti 0.003;
[0037] N 0.0047; H 0.00005; 00.0010; the rest are Fe and unavoidable impurities.
[0038] The steps of this embodiment are:
[0039] 1. The temperature of the ingot mold before casting is 60°C.
[0040] 2. Ingot type 8.4t, 3 trays, 6 ingot molds for each tray, and the inside of the mold is cleaned before casting; the ingot mold is purged with argon, and the tube is inserted into each tray and blown with argon at a flow rate of 360L / min 4 Minutes; 16Kg of mold powder is added to each tube.
[0041] 3. The temperature of molten steel is 1553 before pouring. (The degree of superheat of molten steel is 53°C).
[0042] 4. Before pouring, the ladle is covered with a cover, and the cap is covere...
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Abstract
The invention relates to a mold casting method for a hollow axle steel of a high-speed passenger train. The method comprises the following sequential steps of: I, setting the temperature of ingot molds to be 30-80 DEG C before casting; II, casting 2-3 discs for each furnace, preparing 4-6 ingot molds of which capacity is 5.8-8.4 tons, pumping inside of the mold to be clean before casting, purging the ingot molds with argon, and adding 12-16Kg of casting powder for each ingot mold; III, setting molten steel superheat degree before casting process to be 35-55 DEG C; IV, before the casting process, adding a cover for the steel ladle, covering a cap opening with an iron sheet, opening the steel ladle, discharging 1.0-1.5t of steel, after putting the steel stream in order, adding a central casting pipe for casting, carrying out argon sealing protection during the steel casting process, setting the ingot casting speed to be 125-165mm/min, setting the cap opening casting speed to be 35-65mm/min, when casting 1/2-2/3 of the cap opening, carrying out trickle filling, and adding 9-12Kg of heat generating agent for each ingot mold when casting to 2/3 height of the cap opening; and V, setting the time from the end of casting to demolding of the steel ingot to be not less than 4.5 hours. With the steel ingot formed by mold casting method provided by the invention, the general looseness and the central looseness of the macrostructure of the axle billet cogged by the blooming mill are not more than 0.5 level, and the pattern segregation is 0.
Description
technical field [0001] The invention relates to a method for die-casting steel for hollow axles of high-speed railway passenger cars. Background technique [0002] It is used to make steel for hollow axles of railway passenger cars with a speed of more than 200 kilometers per hour. The requirements for steel purity, low-magnification structure and mechanical properties are very strict. [0003] The existing method of die-casting steel for hollow axles of high-speed railway passenger cars is to use a single 5.8-8.4-ton ingot to die-cast a steel ingot at a superheat of 60-70°C, and to produce a 250mm×250mm- 280mm×280mm axle billet, the general looseness of the low-magnification structure and the center porosity are 0.5-2.5, which can only meet the requirements of conventional axle billets. Contents of the invention [0004] In order to overcome the above-mentioned shortcomings of the existing steel die casting method for hollow axles of high-speed railway passenger cars, th...
Claims
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