CrNiMo round steel for wind power gear and preparation method
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A round steel and gear technology, applied in the field of CrNiMo round steel for wind power gears and its production process, can solve problems such as pits and pits on the material, affecting product surface quality, etc., reduce component segregation, and optimize continuous casting parameter settings , Realize the effect of constant pulling speed casting
Inactive Publication Date: 2021-03-19
ZENITH STEEL GROUP CORP +1
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In addition, in addition to paying attention to the control of material properties such as purity, hardenability, banding, etc., the problem of phosphorus removal should also be considered at the same time, because Ni-containing steel is difficult to remove scale due to the stickiness of oxide scale, and scale is formed during rolling. Pressing in, resulting in many pits and pitting defects on the material, which seriously affects the surface quality of the product
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Embodiment 1
[0058] (1) The steelmaking raw materials used in the electric furnace are steel scrap and molten iron, and the steel scrap accounts for 10% of the total weight of the steelmaking raw materials, and the molten iron accounts for 90% of the total weight of the steelmaking raw materials, and the total charge is 102t / furnace.
[0059] The electric furnace uses the molten iron tipping device to adopt the online molten iron loading mode, combined with the foam slag operation process, to achieve the purpose of removing P and controlling temperature, tapping [C] 0.08%, tapping [P] 0.009%, residual [Cu] 0.040%, [B] 0.0002%, tapping temperature 1635°C, adding aluminum block 0.80kg / t, ferrosilicon 0.75kg / t, low-carbon ferromanganese 5.5kg / t, low-carbon ferrochrome 27.5kg / t in sequence with the steel flow t. Lime 500kg / furnace, slagging agent 550kg / furnace, the tapping process adopts eccentric furnace bottom tapping, and slag removal is strictly prohibited.
[0060] (2) LF uses 1.5kg / t of ...
Embodiment 2
[0065] Compared with Example 1, the difference is that molten iron accounts for 93% of the total weight of the steelmaking raw materials, the total charging capacity is 108t / furnace, the tapping temperature is 1650°C, the refining white slag time is 31min, the total refining time is 60min, and the refining slag Binary alkalinity 4.0, all the other operations are identical with embodiment 1.
Embodiment 3
[0067] In step (1), electric furnace tapping [C] 0.09%, tapping [P] 0.010%, residual [Cu] 0.037%, [B] 0.0002%, tapping temperature 1630 ° C, and the rest of the operations are the same as in Example 1.
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Abstract
The invention discloses CrNiMo round steel for a wind power gear and a preparation method. The CrNiMo round steel comprises the following ingredients in parts by weight: 0.15%-0.21% of C, 0.17%-0.37%of Si, 0.50%-0.90% of Mn, 1.50%-1.80% of Cr, 1.40%-1.70% of Ni, smaller than or equal to 0.20% of Cu, smaller than or equal to 0.025% of P, smaller than or equal to 0.025% of S, 0.25-0.35% of Mo, smaller than or equal to 0.0020% of O, 0.025-0.040% of Al and 0.0080-0.0120% of N. The preparation method comprises the steps of electric furnace smelting, LF refining, VD vacuum degassing, five-machine five-flow arc-shaped continuous casting machine and rolling, the preparation method is easy to operate and high in production efficiency, the prepared round steel has the advantages of being low in oxygen content, narrow in through hardening band, high in purity, accurate in component control, light in strip shape, excellent in surface quality and the like, and various technical requirements of steel for wind power gears are completely met.
Description
technical field [0001] The invention belongs to the field of metal material production, in particular to a CrNiMo round steel for wind power gears and a production process thereof. [0002] technical background [0003] The gearbox in the wind turbine is an important mechanical component, and its main function is to transmit the power generated by the wind wheel under the action of the wind to the generator and make it obtain a corresponding speed. Wind power generation is affected by natural conditions, and the emergence of some special weather conditions may lead to failure of wind turbines. However, it is impossible for a small cabin to have a solid base foundation like on the ground. The power matching of the entire drive train and the torsional vibration Factors are always reflected in a certain weak link, and a lot of practice has proved that this link is often the gearbox in the unit. Therefore, it is particularly important to strengthen the research on gearboxes. ...
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