Preparation method for sulfur-containing ultra-low titanium high-standard bearing steel
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A technology of bearing steel and ultra-low titanium, applied in the manufacture of converters, etc., can solve the problems of increasing the difficulty of passing fatigue performance and the adverse effects of inclusions
Active Publication Date: 2016-11-23
ZENITH STEEL GROUP CORP +1
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[0005] In addition, since the round steel contains a certain amount of sulfur, sulfur can properly improve the machinability of the bearing steel, but if the process is improperly used in the production process, it will adversely affect the indicators such as inclusions and increase the difficulty of passing the fatigue performance
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Embodiment 1
[0047] Embodiment 1 (stove number 816020415)
[0048] (1) Converter smelting process
[0049] Converter smelting is operated by double slag method, and high-quality molten iron (120 tons per furnace) is used. Among them, the mass content requirements of components in the molten iron: Si: 0.52%, P: 0.085%, S: 0.025%, Ti: 0.025%, The temperature of the molten iron entering the furnace is T=1308°C, and scrap copper is added before smelting. Among them, the amount of scrap copper added is 0.90kg / t, and Cu is increased to 0.09%;
[0050] Converter smelting controls tapping end point [C]=0.20%, end point [P]=0.006%, tapping temperature is 1645°C, double slag blocking operation of slag blocking ball and slide plate is adopted in tapping process, tapping time is 4.5 minutes, tapping At 1 / 4 of the time, add the deoxidizer aluminum block 55kg / furnace, low-nitrogen recarburizer 6.4kg / t, aluminum block 55kg / furnace, low-titanium and low-aluminum ferrosilicon 2.6kg / t, metal manganese 2....
Embodiment 2
[0061] Embodiment 2 (stove number 816020416)
[0062] This furnace is a continuous pouring furnace, the temperature of the hanging bag after soft blowing is set to 1510°C, the degree of superheat is 28°C, the casting speed is 0.70m / min, and the rest of the operations are the same as in Example 1.
Embodiment 3
[0063] Embodiment 3 (stove number 816020417)
[0064] Requirements for the mass content of the components in the molten iron: Si: 0.48%, P: 0.086%, S: 0.022%, the temperature of the molten iron in the furnace T = 1310°C, and the rest of the operations are the same as in Example 2.
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Abstract
The invention relates to a production method for a round steel, and specifically to a preparation method for a sulfur-containing ultra-low titanium high-standard bearing steel. The preparation method comprises a converter smelting procedure, an LF secondary refining procedure, a VD furnace vacuum refining procedure, a bloom continuous casting procedure, and a rolling procedure. Converter smelting is carried out by means of a double-slag process with an endpoint [C] controlled within a range of 0.15% to 0.25%; a double-slag stopping operation with a slag stopping ball and a sliding plate is performed during tapping; a slag skimming treatment is carried out before feeding into the LF; an operation of forming white slag as soon as possible is performed; an appropriate slag layer thickness is ensured before VD; VD vacuum breaking is followed by feeding of a Fe-S wire; an operation of remaining steel and slag is performed at the final stage of steel ladle casting; cold charging is adopted for rolling of a casting blank; and heating time is prolonged appropriately. The sulfur-containing ultra-low titanium high-standard bearing steel produced by means of the preparation method is good in machinability, and extremely high in purity, and has a titanium content controlled within 10 ppm and an oxygen content controlled within 6 ppm; moreover, the steel is good in castability, and has more than 10 continuous casting heats without feeding of a si-ba wire; therefore, high production efficiency is achieved.
Description
technical field [0001] The invention belongs to the field of steel production and manufacturing, and specifically relates to a preparation method of sulfur-containing ultra-low titanium high-standard bearing steel. Background technique [0002] Bearing steel is a steel type used to manufacture balls, rollers and sleeves of rolling bearings. It belongs to the high-quality special steel category. It can also be used to make precision measuring tools, cold dies, machine tool screws and precision coupling parts for diesel engine oil pumps. Since the bearing is under great pressure and friction during work, the bearing steel is required to have high and uniform hardness, wear resistance, high elastic limit, high fatigue strength, good rust resistance, and good cutting performance It is one of the most stringent steel grades in all steel production. In recent years, the main components of bearing steel have not changed much. With the continuous progress of technical equipment and...
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