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14.5 mm thick special-purpose automobile spoke steel with uniform isotropic properties and its manufacturing method and application

A manufacturing method and technology for automobile wheels, applied in metal processing equipment and other directions, can solve problems such as large differences in performance in all directions and short fatigue life of automobile wheel spokes, and achieve excellent mechanical properties, uniform structure characteristics and morphology, and ensure the effect of fatigue life.

Inactive Publication Date: 2018-12-21
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the existing hot-rolled steel plates for automobile spokes have large differences in anisotropic properties, resulting in short fatigue life of automobile spokes, and provide a 14.5mm thick special-purpose automobile spoke steel with uniform anisotropic properties and its manufacture Methods and Applications

Method used

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  • 14.5 mm thick special-purpose automobile spoke steel with uniform isotropic properties and its manufacturing method and application
  • 14.5 mm thick special-purpose automobile spoke steel with uniform isotropic properties and its manufacturing method and application
  • 14.5 mm thick special-purpose automobile spoke steel with uniform isotropic properties and its manufacturing method and application

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Embodiment 1

[0023] A 14.5mm-thick special-purpose automobile spoke steel with uniform isotropic properties, the chemical composition of which is: C: 0.16%, Si: 0.30%, Mn: 1.50%, P: 0.014%, S: 0.011%, Al t : 0.05%, Ti: 0.02%, O: 0.0022%, and N: 0.003%, and the balance is Fe and unavoidable impurities.

[0024] The method for manufacturing the above-mentioned 14.5mm thick special-purpose automobile spoke steel with uniform anisotropic properties includes molten iron desulfurization pretreatment, converter smelting, LF furnace refining, slab continuous casting, hot rolling, cooling and heat treatment processes, the hot rolling process, Two-stage rolling of rough rolling and finish rolling is adopted, and the ratio of the cross rolling pass to the longitudinal rolling pass in the rough rolling stage is 1:3, among which, there are 8 rough rolling passes, the starting temperature of rough rolling is 1200°C, and the final rolling temperature is 1200°C. 1075°C, 6 passes of finishing rolling, the...

Embodiment 2

[0027] A 14.5mm thick special-purpose automobile spoke steel with uniform isotropic properties, its chemical composition is: C: 0.14%, Si: 0.25%, Mn: 1.35%, P: 0.012%, S: 0.019%, Al t : 0.04%, Ti: 0.01%, O: 0.0021%, and N: 0.0028%, and the balance is Fe and unavoidable impurities.

[0028] The method for manufacturing the above-mentioned 14.5mm thick special-purpose automobile spoke steel with uniform anisotropic properties includes molten iron desulfurization pretreatment, converter smelting, LF furnace refining, slab continuous casting, hot rolling, cooling and heat treatment processes, the hot rolling process, Two-stage rolling of rough rolling and finish rolling is adopted, and the ratio of the cross rolling pass to the longitudinal rolling pass in the rough rolling stage is 1:4.5, among which, there are 11 rough rolling passes, the rough rolling start temperature is 1150°C, and the finish rolling temperature is 1150°C. 1050°C, 6 passes of finishing rolling, the starting ...

Embodiment 3

[0031] A 14.5mm-thick special-purpose automobile spoke steel with uniform isotropic properties, the chemical composition of which is: C: 0.15%, Si: 0.27%, Mn: 1.40%, P: 0.010%, S: 0.012%, Al t : 0.035%, Ti: 0.015%, O: 0.0019%, and N: 0.0025%, and the balance is Fe and unavoidable impurities.

[0032] The method for manufacturing the above-mentioned 14.5mm thick special-purpose automobile spoke steel with uniform anisotropic properties includes molten iron desulfurization pretreatment, converter smelting, LF furnace refining, slab continuous casting, hot rolling, cooling and heat treatment processes, the hot rolling process, Two-stage rolling of rough rolling and finish rolling is adopted, and the ratio of cross-rolling passes to longitudinal rolling passes in the rough-rolling stage is 1:6, of which there are 7 rough-rolling passes, the rough-rolling start temperature is 1250°C, and the finish-rolling temperature is 1:6. 1100°C, 6 passes of finishing rolling, the starting tempe...

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Abstract

The invention discloses 14.5mm-thickness dedicated automobile spoke steel uniform in property and a manufacturing method and application of the spoke steel, and belongs to the field of micro-alloying steel manufacturing. In the manufacturing method, a rough rolling and precision rolling two-stage rolling mode is adopted to carry out rolling on a slab, the proportion of the transverse rolling pass to the longitudinal rolling pass meets 1:1.5N in the rough rolling stage, N is a positive integer and is larger than or equal to 2, in the cooling process, the rule that the length of a steel plate is matched with the conveying speed of a conveying roller way and the cooling water amount is adopted for carrying out control, the steel plate is cooled and then is subject to further heat treatment in a normalizing manner, and the rotary pressing manner is adopted in spoke manufacturing. The tensile strength of the steel plate manufactured through the method can reach more than 510 MPa, the difference of the longitudinal and transverse mechanical properties can be controlled within 50 MPa, the fatigue life of a spoke manufactured through the steel plate can reach more than 2400000 times, and through inspection of an automobile wheel enterprise, the use requirement can be met.

Description

technical field [0001] The invention relates to the field of micro-alloyed steel manufacturing, in particular to a 14.5mm-thick special-purpose automobile spoke steel with uniform isotropic properties, a manufacturing method and application thereof. Background technique [0002] The wheel is one of the key components of a car, generally composed of a hub, rim and spokes. Under high-speed rotation, it usually bears alternating mechanical stress, road impact load and local temperature stress caused by inertial braking, etc., which will seriously affect the wheel. service life. As one of the components of automobile wheels, the spokes are mainly used to connect the hub and the rim, and are connected to the hub through bolts, so the length of its service life will also affect the service life of the wheel. [0003] At present, the spoke materials of automobiles are mainly thick carbon and low-alloy high-strength steels such as Q235B, 420CL, 490CL, 540CL and 590CL. [0004] Pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/06C21D8/02B21D22/14B21D53/26
CPCB21D22/14B21D53/265C21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 王世森鲍海燕李德发杜明张欢余宏伟梁宝珠李银华
Owner 武汉钢铁有限公司
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