Cooling method of heavy and medium plate controlled rolling intermediate blank

A cooling method and controlled cooling technology, applied in the field of steel rolling production cooling, can solve the problems of large overall investment, complex equipment, high requirements on gas path cleanliness and pressure control range, etc., to reduce investment, simple equipment, and enhance cooling uniformity. Effect

Inactive Publication Date: 2010-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned intermediate billet cooling system in the form of gas mist cooling has relatively complicated equipment, and has high requirements for the cleanliness of the air and water channels and the pressure control range, resulting in a large overall investment, which limits its use to a certain extent

Method used

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  • Cooling method of heavy and medium plate controlled rolling intermediate blank
  • Cooling method of heavy and medium plate controlled rolling intermediate blank
  • Cooling method of heavy and medium plate controlled rolling intermediate blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one: to produce the container steel plate of 12mm thickness, adopt the attached figure 2 The intermediate billet controlled cooling technology arranged as an example to further describe its process method. The steel billet is heated to 1200°C, and the billet is sent to the rough rolling mill (1) by the conveying roller table for recrystallization rolling. The reduction is >50%. After the intermediate billet leaves the roughing mill, it enters the intermediate billet controlled cooling area (3) by the transfer roller table, and is rapidly cooled to the non-recrystallized area. The speed is controlled at 1°C / s and cooled to 800°C. The specific process parameters are all precisely controlled by the computer. The intermediate cooling water adopts the rolling mill cooling water in the public water circulation system of the workshop, and the water supply pressure is 0.4MPa. The intermediate slab after controlled cooling is directly entered into the finish rolli...

Embodiment 2

[0036] Embodiment two: to produce the X80 pipeline steel of 14.7mm thickness, adopt the attached figure 2 The intermediate billet controlled cooling technology arranged as an example to further describe its process method. The steel billet is heated to 1200°C, and the billet is sent to the rough rolling mill (1) by the transfer roller table for high-temperature recrystallization rolling. The termination temperature of the high-temperature recrystallization rolling is controlled at 1100°C, and rolled into an intermediate billet with a thickness of 50mm. The cumulative reduction in the recrystallization zone is >50%. After the intermediate billet exits the rough rolling mill, it enters the intermediate billet controlled cooling area (3) by the transfer roller table, and is rapidly cooled to the non-recrystallization temperature area. Water cooling, the cooling speed is controlled at 5°C / s, and the temperature is cooled to 900°C. The specific process parameters are all precisel...

Embodiment 3

[0037] Embodiment three: take the DH36 ship plate steel of producing 50mm thickness as example, adopt the attached Figure 5Arranged intermediate billets control cooling technology. Send the heated billet into the rolling mill (1) for rolling in the recrystallization zone of the rough rolling stage. The termination temperature of the rough rolling stage is 1180° C., and the steel billet is rolled into an intermediate billet with a thickness of 110 mm in the rough rolling stage. The intermediate billet then enters the rolling mill from the transfer roller table (1) to the intermediate billet controlled cooling area in front of the mill (2) After the rapid cooling rate is controlled at 10°C / s, it is rapidly cooled to 950°C, and the intermediate cooling process adopts a pressure of 0.4-1.0MPa The cooling water of the rolling mill, as well as the impact jet water cooling method of the upper and lower headers with high-density and super-density nozzles, and the process parameters a...

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Abstract

The invention belongs to a producing and cooling technique of rolled steel, relating to a cooling method of a heavy and medium plate controlled rolling intermediate blank, which can be realized by both a single-stand heavy and medium plate roll and a double-stand heavy and medium plate roll. The cooling method comprises the following steps of: transmitting a roughly rolled intermediate blank with the thickness range of 30-110 mm in an austenite recrystallization zone into an intermediate controlled cooling zone from a transmission roller way for rapidly cooling to 800-950 DEG C, and then transmitting the intermediate blank into the roll for rolling in a non- recrystallization zone after short-time air cooling and temperature evening. In the intermediate cooling process, an upper collecting pipe and a lower collecting pipe with high density or ultra-high density are adopted to impact, jet and cool the intermediate blank, and specific technological parameters are accurately controlled by a computer. Water is cooling water for the roll with the pressure of 0.3-1.0 MPa in a common water circulating system for workshops. The intermediate cooling holding time is 30-70% shorter than that of the conventional process so that the production efficiency is improved, and due to austenite grain refinement after intermediate controlled cooling, the mechanical properties of a steel plate can be improved.

Description

technical field [0001] The invention belongs to the cooling technology for steel rolling production, in particular to a cooling method for a medium-thick plate controlled rolling intermediate billet. Background technique [0002] In order to improve the strength and toughness of steel, the austenite grains are refined by controlled rolling or the dislocation slip bands inside the deformed austenite grains are increased, that is, the effective grain boundary area is increased, which is the ferrite nucleation during phase transformation. Provide more and more dispersed nucleation sites, and obtain finely dispersed ferrite and pearlite or bainite structures. Refining ferrite grains can not only increase the strength of steel, but also improve the toughness of steel. However, the development of the traditional controlled rolling theory has not surpassed the three-stage controlled rolling technology, namely: rolling in the austenite recrystallization zone, rolling in the austeni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/76
Inventor 余伟何春雨张立杰刘涛韩爽程知松徐言东邓宏玉詹智敏
Owner UNIV OF SCI & TECH BEIJING
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