Method and device for manufacturing cold-rolled high-strength steel

A high-strength steel and finishing rolling technology, applied in the field of manufacturing cold-rolled high-strength steel, can solve the problems of low-temperature coiling temperature fluctuations, unguaranteed cold rolling stability, etc.

Active Publication Date: 2018-03-23
SHOUGANG JINGTANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a method and device for manufacturing cold-rolled high-strength steel, which is used to solve the problem of severe fluctu

Method used

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  • Method and device for manufacturing cold-rolled high-strength steel
  • Method and device for manufacturing cold-rolled high-strength steel

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Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a method for manufacturing cold-rolled high-strength steel, such as figure 1 As shown, the method includes:

[0033] S101, heating the strip steel slab, controlling the heating temperature to be 1180-1200°C, and controlling the heating time to be 180-200min;

[0034] In this step, the strip steel slab is heated by fast firing and low-temperature tapping technology. In order to comprehensively consider the fayalite phase Fe 2 SiO 4 The formation and thickness of the formation, control the heating temperature to 1180-1200°C, preferably: 1190-1200°C; control the heating time to 180-200min, preferably 185-195min. Wherein, the mass percentage of each component of the strip steel slab includes: C: 0.08-0.13%; Si: 1.1-1.4%; Mn: 1.4-2.0%; Al: 0.02-0.065%; P≦0.020%.

[0035] S102, performing rough rolling on the heated strip steel slab, controlling the rough rolling temperature to be 980-1000°C;

[0036] Then semi-continuous rough rolling is carried ...

Embodiment 2

[0048] Corresponding to Embodiment 1, this embodiment provides a device for manufacturing cold-rolled high-strength steel, such as figure 2 As shown, the device includes: a first control unit 21, a second control unit 22, a third control unit 23 and a fourth control unit 24; wherein,

[0049] The strip steel slab is heated by fast firing and low-temperature tapping technology, in order to comprehensively consider fayalite phase Fe 2 SiO 4 The first control unit 21 is used to control the heating and tapping temperature to be 1180-1200°C, preferably 1190-1100°C when heating the strip steel slab, and to control the heating time to be 180-200min, preferably The ground is 185 ~ 195min.

[0050] Wherein, the mass percentage of each component of the strip steel slab includes: C: 0.08-0.13%; Si: 1.1-1.4%; Mn: 1.4-2.0%; Al: 0.02-0.065%; P≦0.020%.

[0051] In order to reduce the generation of red rust in the rolling process and ensure the finish rolling strip piercing speed, the sec...

Embodiment 3

[0061] In actual application, when manufacturing cold-rolled high-strength steel CR420 / 780DP according to the method provided in Embodiment 1 and the device provided in Embodiment 2, the specific implementation is as follows:

[0062] Here, the mass percentage of each component of the strip steel slab includes: C: 0.08-0.10%; Si: 1.1-1.2%; Mn: 1.9-2.0%; Al: 0.02-0.06%; P≦0.020%.

[0063] The strip steel slab is heated by fast firing and low-temperature tapping technology, in order to comprehensively consider fayalite phase Fe 2 SiO 4 The formation and thickness of the formation, control the heating temperature to 1198 ℃; control the heating time to 192min.

[0064] Then semi-continuous rough rolling is carried out on the heated strip slab. In order to reduce the generation of red rust in the rolling process and ensure the strip piercing speed of finish rolling, the exit temperature of rough rolling is controlled at 986°C.

[0065] Then use the finish rolling stand to carry o...

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Abstract

The embodiment of the invention provides a method and a device for manufacturing cold-rolled high-strength steel. The method comprises the following steps: heating a strip steel slab, controlling theheating and tapping temperature to be 1,180-1,200 DEG C, and controlling the heating time to be 180-200 min; performing rough rolling on the heated strip steel slab, and controlling the rough rollingtemperature to be 980-1,000 DEG C; performing finish rolling on the strip steel slab subjected to rough rolling, and controlling the final finish rolling temperature to be 860-880 DEG C; and performing laminar cooling on the strip steel slab subjected to finish rolling, in the laminar cooling process, controlling a cooling manifold in a main cooling area to be in an open state and controlling a cooling manifold in a feedback area to be in a closed state. Therefore, in the laminar cooling process, the cooling manifold in the main cooling area is controlled to be in an open state, and the cooling manifold in the feedback area is controlled to be in a closed state, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the precision in controlling the strip steel winding temperature is improved, the winding temperature is prevented from severe fluctuation, and the cold rolling stability of follow-up procedures is ensured.

Description

technical field [0001] The invention belongs to the technical field of steel production, in particular to a method and device for manufacturing cold-rolled high-strength steel. Background technique [0002] In the field of steel production technology, silicon is a common element that improves the hardenability of steel and the strength of finished products. At present, dual-phase steel and TRIP steel are mainly designed to contain high content of silicon in cold-rolled high-strength steel, but the addition of silicon It leads to serious red rust defects on the surface of the strip steel, which ultimately affects the use of customers. In order to solve the problem of surface red rust, low-temperature coiling process system is required in production, but after water cooling, the strip steel has poor shape quality, and the coiling temperature fluctuates violently, and the deviation from the target coiling temperature is too large, which affects the subsequent process Stability...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06B21B37/74
CPCB21B37/74C21D8/0226C21D8/0236C22C38/02C22C38/04C22C38/06
Inventor 徐芳夏银锋秦红波李恺李东宁谢光远胡亮刘鸿明王智锋文杰林海海
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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