Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery

A technology of mechanical steel and micro-alloying, which is applied in the direction of temperature control, etc., can solve the problem that there is no steel coil inner and outer ring strength properties. Effective improvement measures are proposed, and the performance of the inner and outer rings of the steel coil and the uniformity of the width direction are studied. and elaboration, without paying attention to the performance fluctuation of high-strength mechanical steel, to achieve the effect of improving the comprehensive yield, improving the uniformity of properties, and improving the strength and mechanical properties

Active Publication Date: 2013-04-10
SHOUGANG CORPORATION
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Problems solved by technology

The Chinese patent with the patent publication number 101899616A introduces a production method of 600MPa grade high-strength steel by hot continuous rolling. It also does not study and explain the performance of the inner and outer rings of the steel coil and the uniformity in the width direction.
The existing technology does not propose effective improvement measures on how to improve the strength performance of the innermost ring and outermost ring of the steel coil
[0006] (2) No attention was paid to the performance fluctuation of high-strength mechanical steel along the width direction of the plate. The strength performance of the two edges of the thin gauge (≤5mm) high-strength mechanical steel along the w

Method used

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  • Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery
  • Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery
  • Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery

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Embodiment 1

[0030]This embodiment provides a method for improving the uniformity of the coil performance of Ti microalloyed high-strength mechanical steel. By changing the shape of the coiling curve and using U-shaped cooling, the coiling temperature of the innermost 15-meter circle of the coil is increased by 15- At 20°C, the coiling temperature of the 15-meter outermost circle of the coil increases by 10-15°C. In this embodiment, the coiling temperature setting value of the original process is 600°C. In the present invention, the coiling temperature is controlled at 620°C within 15 meters of the inner circle of the steel coil, and the coiling temperature is controlled at 615°C within 15 meters of the outermost circle of the steel coil. ℃ control. Then samples were taken at 3 meters from the inner circle of the coil, at the normal position in the middle of the steel coil, and at 1.5 meters from the outermost circle of the coil for mechanical performance inspection. The impact sample siz...

Embodiment 2

[0038] A method for improving the uniformity of Ti microalloyed high-strength mechanical steel coil performance provided by this embodiment is to use an induction heater to heat the intermediate billet before finish rolling, so that the temperature of the heated intermediate billet is higher than that of the rough rolled billet. The ending temperature is 0-150°C higher to make up for the temperature drop caused by excessive heat dissipation at the edge of the thin-gauge intermediate billet, thereby improving the uniformity of the final product along the transverse direction. The steel type selected in this example is a Ti microalloyed high-strength steel with a yield strength of 700 MPa, and the Ti content is 0.12%. The specific chemical composition is shown in Table 3. In the production process, the rough rolling finish temperature is set at 1080°C. According to the method of the present invention, the edge portion of the intermediate billet is induction heated before finishin...

Embodiment 3

[0046] The difference between this embodiment and Embodiment 1 is that in this embodiment, the coiling temperature is controlled at 615° C. within 15 meters of the inner ring of the steel coil, and 610° C. within 15 meters of the outermost ring of the steel coil. Other places are completely consistent with Embodiment 1.

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Abstract

The invention discloses a method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, which comprises the following steps: refining and heating molten steel with Ti addition amount of 0.07-0.14% and roughing the molten steel to obtain an intermediate billet; heating the edge of the intermediate billet and then finish rolling to obtain a hot rolled plate; cooling the hot rolled plate in a U-shape and rolling into a hot roll; and straightening the hot roll and obtaining the product. According to the method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, the performance uniformity of the final product in the rolling direction is improved in the U-shaped cooling model in the cooling process, and the comprehensive yield is improved. With the adoption of edge inductive heating of the intermediate billet, the performance uniformity of the final product in the horizontal direction is improved, and the safety of the material in the using process is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel material production, in particular to a method for improving the uniformity of the coil performance of Ti microalloyed high-strength mechanical steel. Background technique [0002] High-strength mechanical steel with a yield strength of 460MPa~700MPa has been widely used in the manufacture of truck cranes, concrete pump arms and other large-scale mechanical equipment. Ti, relying on the precipitation strengthening effect of TiC to greatly improve the strength level of the material. [0003] The Chinese patent with publication number 101538680 introduces a production method for producing 600MPa grade high-strength steel based on thin slab continuous casting and rolling production mode, but the patent does not study and explain how to control the uniformity of the material coil. The Chinese patent with patent publication number 101899616A introduces a production method of 600MPa grade high-s...

Claims

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Application Information

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IPC IPC(8): C21D8/02B21B37/74
Inventor 潘辉李飞周娜包春林孙常库赵林
Owner SHOUGANG CORPORATION
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