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Method for rolling thick specification low-alloy structure steel plate by using middle and thin plate blank

A medium-thin slab, thick-gauge technology is applied in the field of rolling thick-gauge low-alloy structural steel plates using medium-thin slabs, which can solve the problems of inability to meet the needs of welded pipe manufacturers and thin thickness.

Inactive Publication Date: 2008-03-26
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the product of this invention is also relatively thin, and it cannot meet the needs of some welded pipe manufacturers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Use Q345B steel produced by Laiwu Iron and Steel Group Co., Ltd.

[0025] Converter smelting Q345B steel, the weight percentage of the chemical composition of the steel is: C: 0.16%, Si: 0.25%, Mn: 1.48%, S: 0.016%, P: 0.021%, the steel is cast into 160mm thick by conventional continuous casting method The continuous casting slab is sent to the 1500mm hot continuous rolling mill for rolling, and the whole process of heating, rolling and cooling is controlled.

[0026] The hot rolling process is controlled as follows:

[0027] a. Control the continuous casting slab heating temperature to 1220°C; b. Roughly roll the slab at 1180°C. The rough rolling adopts 5 round-trip rolling, and the steel temperature after the fifth pass is 1025°C. The thickness of the intermediate billet after rough rolling is 40mm; d, the entrance temperature of finish rolling is 1010°C; e, two rolling mills F2 and F4 are used for finishing rolling to carry out continuous rolling with ...

Embodiment 2

[0029] Embodiment 2: using Q345B steel produced by Laiwu Iron and Steel Group Co., Ltd.

[0030] Converter smelting Q345B, the weight percentage of the chemical composition of steel is: C: 0.16%, Si: 0.30%, Mn: 1.58%, S: 0.010%, P: 0.015%, the steel is cast into 160mm thick by conventional continuous casting method The slab is continuously cast, and the slab is sent to the 1500mm hot continuous rolling mill for rolling, and the whole process of heating, rolling and cooling is controlled.

[0031] The hot rolling process is controlled as follows:

[0032] a. Control the continuous casting slab heating temperature to 1220°C; b. The slab is subjected to rough rolling at 1190°C. The rough rolling adopts 5 round-trip rolling, and the steel temperature is 1040°C after the fifth pass. The thickness of the intermediate billet after rough rolling is 45mm; d, the entrance temperature of finish rolling is 1030°C; e, two rolling mills F2 and F4 are used for finishing rolling to carry out...

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Abstract

The present invention relates to production of structural low alloy steel plate, and is especially process of producing high strength hot rolled coiled sheet of 16-20 mm thickness with continuous cast billet of 150-170 mm thickness. The steel has chemical composition comprising C 0.15-0.20 wt%, Si 0.20-0.40 wt%, Mn 1.40-1.60 wt%, S not more than 0.030 wt%, P not more than 0.030 wt%, and Fe and impurity for the rest. The production process includes the steps of controlled heating, rough rolling, finish rolling, cooling, etc. and the produced hot rolled coiled sheet has simple composition, low cost, high tensile strength, high yield strength, high elongation, high impact toughness, high cold bending performance, good welding performance and other features.

Description

technical field [0001] The invention relates to a method for rolling thick-gauge low-alloy structural steel plates by using medium-thin slabs. Background technique [0002] Low-alloy structural steel has good comprehensive mechanical properties, welding properties, process properties and low-temperature impact toughness. This kind of product has stable quality and is suitable for welding structural parts of various rolling stock, lifting equipment, mining machinery, motors, boilers, petroleum, chemical industry, shipbuilding, bridges and other industries and other construction machinery in low temperature areas. Its advantages are higher strength, better performance, saving a lot of steel, reducing structural weight, etc. In the past, most of the thick-gauge low-alloy steel structural steel products used by most welded pipe manufacturers were medium and thick plates. However, due to the limited length of the medium and thick plates, welding must be carried out in the proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02B21B37/00B21C47/02
Inventor 王腾飞汤化胜周平刘莱萌霍孝新赵培林
Owner LAIWU IRON & STEEL GRP
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