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A low-cost 225mpa grade low yield point damper steel plate and steel strip preparation method

A low yield point and damper technology, applied in the field of metallurgy, can solve the problems that are not conducive to steel plate welding and low temperature impact performance, increase manufacturing difficulty and cost, and high production cost, and achieve good low cycle fatigue performance, low production cost, The effect of hysteresis curve smoothing

Active Publication Date: 2019-03-19
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patent documents all involve the manufacture of 225MPa low-yield steel. The composition of the above-mentioned patents is based on ultra-low carbon-low silicon-manganese, adding one or more trace alloys such as Nb, Ti, V, Cr, B, Zr, etc. The addition of alloying elements such as Nb, Ti, V, Cr, B, Zr, etc. not only greatly increases the difficulty and cost of manufacturing, but also is not conducive to the welding of steel plates and the guarantee of low temperature impact performance.
Some need subsequent normalizing and annealing process after rolling CN 101775536 A, high production cost

Method used

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  • A low-cost 225mpa grade low yield point damper steel plate and steel strip preparation method
  • A low-cost 225mpa grade low yield point damper steel plate and steel strip preparation method
  • A low-cost 225mpa grade low yield point damper steel plate and steel strip preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A. Heat a 200×1500×9800mm (thickness×width×length) low-carbon aluminum-killed steel slab to 1310°C, keep it warm for 60min, and then release it from the furnace.

[0029] B. Spray and descale the high-temperature billet in step A with high-pressure water with a pressure of 165 bar for 6 seconds;

[0030] C. Send the descaled steel slab in step B to the double-stand reversible steckel rolling mill. Under the conditions of starting rolling temperature of 1250-1260°C and rolling speed of 1.4-3.0m / s, after each pass of rolling is completed Carry out the rolling of the next pass in the opposite direction, with a delay of 5 seconds between the upper and lower rolling passes, and reciprocate rough rolling for 3 passes to obtain a rough rolled steel strip;

[0031]D. Carry out reciprocating rolling of the rough-rolled steel strip in step C at a rolling speed of 1.9-3.4 m / s, with a delay of 5-6 seconds between the upper and lower rolling passes. The steel strip obtained by the ...

Embodiment 2

[0036] A. Heat a 200×1500×9800mm (thickness×width×length) low-carbon aluminum-killed steel slab to 1310°C, keep it warm for 60min, and then release it from the furnace.

[0037] B, be that the high-pressure water of 185bar is sprayed descaling to the high-temperature billet of step A for 8 seconds with pressure;

[0038] C. Send the descaled steel slab in step B to the double-stand reversible steckel rolling mill. Under the conditions of starting rolling temperature of 1250-1260°C and rolling speed of 1.4-3.0m / s, after each pass of rolling is completed Reversely carry out the rolling of the next pass, delay the time of 4 seconds between the upper and lower rolling passes, and reciprocate rough rolling for 3 passes to obtain a rough rolled steel strip;

[0039] D. Reciprocating finish rolling of the rough-rolled steel strip in step C at a rolling speed of 1.9-3.4 m / s, with a delay of 5-6 seconds between the upper and lower rolling passes. After the 3rd pass, the steel strip en...

Embodiment 3

[0044] A. Heat a 200×1500×9800mm (thickness×width×length) low-carbon aluminum-killed steel slab to 1300°C, keep it warm for 60 minutes, and then release it from the furnace.

[0045] B. Spray and descale the high-temperature steel billet in step A for 7 seconds with high-pressure water with a pressure of 175 bar;

[0046] C. Send the descaled steel slab in step B to the double-stand reversible steckel rolling mill. Under the conditions of starting rolling temperature of 1250-1260°C and rolling speed of 1.4-3.0m / s, after each pass of rolling is completed Carry out the rolling of the next pass in the opposite direction, with a delay of 5 seconds between the upper and lower rolling passes, and reciprocate rough rolling for 3 passes to obtain a rough rolled steel strip;

[0047] D. The rough-rolled steel strip in step C is reciprocated and finish-rolled for 2 passes under the condition that the rolling speed is 1.9-3.4 m / s. There is a delay of 5-6 seconds between the upper and lo...

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Abstract

The invention discloses a preparation method for steel plates and steel strips for low-cost 225 MPa-stage low-yield-point dampers. The preparation method comprises the following four steps of heatinga steel billet, descaling, rough rolling, finishing rolling and cooling, specifically, low-carbon aluminum killed steel billets are heated, high-pressure water sprays the high-temperature steel billets for descaling, then the steel billets are sent into a reversible double-rack furnace coiling rolling machine for reciprocating rough rolling and finishing rolling, the steel strips operate on cooling roller ways after rolling is completed and enter a laminar flow cooling section to be cooled, the finished plates are rolled or sheared on line, then stack cooling is conducted till the indoor temperature is reached, and thus steel with the thickening being 6-30 mm for the 225 MPa-stage low-yield-point dampers is obtained. According to the preparation method, expensive micro-alloying elements donot need to be added, smelting means such as furnace external refining and vacuum treatment are not needed, heat treatment does not need to be conducted after rolling, and thus the production cost islow. The steel plates and the steel strips obtained through the preparation method have low yield strength fluctuation, good plasticity and good toughness and have excellent impact and welding performance and low-cycle fatigue performance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method for manufacturing 225MPa low-yield point damper steel at low cost. Background technique [0002] Damper is a device for energy consumption and shock absorption in passive control of structures. Damper devices are installed in some parts of large and medium-sized steel structures (such as supports, shear walls, joints or connectors), and the use of dampers with low yield point steel It has excellent plastic deformation performance. During earthquake or wind vibration, the steel with low yield point of the damper undergoes plastic yield hysteretic deformation to dissipate the energy input into the structure, absorb the energy input into the structure by earthquake or wind vibration, and reduce the main body The earthquake response of the structure, so as to avoid the damage or collapse of the structure, and achieve the purpose of shock absorption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/04C22C38/06C22C38/02
Inventor 张瑜赵宇李金柱陈伟马红权文玉兵朱雄伟刘红兵
Owner WUKUN STEEL
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