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Controlled cooling device and method for reducing core-surface temperature difference and surface hardness of large-specification bar

A surface hardness and large-scale technology, applied in temperature control, workpiece surface treatment equipment, cooling bed, etc., can solve problems affecting the rolling line rhythm and reducing rolling efficiency

Inactive Publication Date: 2021-04-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can achieve the effect that the contact surface between the intermediate billet and the ring frame is always in a changing state, so that the intermediate billet can be cooled evenly, but the cooling cycle of each intermediate billet is 2 to 4 times the rolling cycle, which greatly affects the rolling line. rhythm, reducing the rolling efficiency

Method used

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  • Controlled cooling device and method for reducing core-surface temperature difference and surface hardness of large-specification bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The controlled rolling bar is 42CrMoA, the bar specification is Φ90mm, and the continuous casting slab size used is 320*480mm.

[0024] The billet is heated in the heating furnace 1, and the furnace temperature is 1130°C. After descaling 2 by high-pressure water, it enters the reciprocating rough rolling unit 3 for rough rolling. After rough rolling, after the head and tail are cut off by the first hot saw 4, when the temperature reaches 1050° C., the rolled piece enters the horizontal and vertical alternating middle rolling unit 5 for rolling. After the intermediate rolling is completed, the rolled piece moves laterally to the marshalling stand 6 for waiting for temperature treatment. When the temperature of the rolled piece reaches 910°C, it is sent to the output roller table by the steel transfer trolley. The rolled piece passes through the pre-finishing unit 7 without pre-finishing. After the head and tail are cut off by the second hot saw 8, the rolled...

Embodiment 2

[0026] Example 2: The controlled rolling bar is SAE4137H, the bar specification is Φ130mm, and the continuous casting slab size used is 320*480mm.

[0027]The billet is heated in the heating furnace 1, and the furnace temperature is 1130°C. After descaling 2 by high-pressure water, it enters the reciprocating rough rolling unit 3 for rough rolling. After rough rolling, the first hot saw 4 cuts off the head and tail, the temperature of the rolled piece reaches 1050°C, and the rolled piece enters the horizontal and vertical alternating intermediate rolling unit 5 for final rolling to produce the finished product. After the rolling is completed, the rolled piece moves laterally to the marshalling stand 6 for waiting for temperature treatment. When the temperature of the rolled piece reaches 820°C, the rolled piece is sent back to the rolling roller table by the steel transfer trolley. The rolled piece is empty through the pre-finishing rolling group 7 without pre-finishing, and...

Embodiment 3

[0029] Example 3: The controlled rolling bar is 20CrMoTiH, the bar size is Φ60mm, and the continuous casting slab size used is 320*480mm.

[0030] The intermediate billet is heated in the heating furnace 1, and the furnace temperature is 1130°C. After dephosphorization 2 by high-pressure water, it enters the reciprocating rough rolling unit 3 for rough rolling. After rough rolling, the first hot saw 4 cuts off the head and tail, and the temperature of the rolled piece reaches 1050° C., and the rolled piece enters the alternate intermediate rolling unit 5 for intermediate rolling. After the intermediate rolling is completed, the rolled piece moves laterally to the marshalling stand 6 for waiting for temperature treatment. When the temperature of the rolled piece reaches 920°C, the rolled piece is just sent back to the rolling roller table by the cooling roller table. When the temperature reaches 910°C, the rolled piece is sent to the pre-finish rolling unit 7 for pre-finish r...

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Abstract

The invention discloses a controlled cooling device and method for reducing core-surface temperature difference and surface hardness of a large-specification bar. The device achieves the controllable-speed horizontal lateral moving-out and moving-in of the bar on the basis of normal rolling equipment by arranging a marshalling rack between an intermediate rolling unit and a pre-finishing rolling unit. In a moving-out and moving-in process, the bar rotates uniformly to regulate and control a cooling speed, and controllable speed cooling on the bar is achieved; and by installing a heat preservation cover with an auxiliary heating device on a cooling bed, controllable cooling on a finish-rolled bar is achieved so as to control a cooling structure of the finish-rolled bar, and finally, the purpose of reducing the core-surface temperature difference and the surface hardness of the bar is achieved.

Description

technical field [0001] The invention belongs to the technical field of bar processing, and in particular relates to a cooling control device and method for reducing the temperature difference and surface hardness of large-sized bar cores. Background technique [0002] With the development of the market, the demand for high-quality rod and wire products is also increasing. In China, bars with a specification above Φ50mm are called large-size bars. Large-size bars are mainly made of high-quality gear steel, bearing steel, shaft steel and alloy tube blanks, and are committed to meeting the needs of machinery, automobiles, military, railways and other industries rapid development. In recent years, with the improvement of the quality of continuous casting slabs, the extension of bar specifications and the introduction of various foreign large-scale equipment, the quality and application space of large-size bars have been further improved, and are also being used for wind power, ...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B45/02B21B43/00B21B37/74
Inventor 李佑河黄贞益侯清宇代孟强廖振成席波李康唐鑫
Owner NANJING IRON & STEEL CO LTD
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