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Hot-rolled tube billet heating process

A technology of hot-rolled tube and process, which is applied in the field of ring furnace heating process of hot-rolled tube billet, which can solve the problem of uneven wall thickness of blank tube after continuous rolling, without considering the degree of temperature increase of tube billet, and affecting the continuous rolling process And other problems, to achieve the effect of reducing the thickening of the head, reducing the amount of head cutting, and reducing production costs

Inactive Publication Date: 2010-07-14
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the above basic process considers the temperature increase of the tube blank during piercing, it does not consider the difference in the degree of increase in the temperature of the tube blank in the longitudinal direction (in the length direction). ℃, and the temperature difference between the head and the tail is larger when the multi-scale ruler is produced
This head-to-tail temperature difference will affect the subsequent continuous rolling process, thereby increasing the wall thickness unevenness of the blank tube after continuous rolling, resulting in thickening of the head

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Taking the finished product specification as: Φ139.7mm (diameter)×9.17mm (wall thickness) and the steel grade of 30Mn2V as an example, the specification of its core tube blank is Φ200mm (diameter)×3300mm (length), hollow after perforation The specification of the capillary is Φ228mm(diameter)×18.2mm(wall thickness)×830mm(length). The production steps and processes are as follows:

[0018] 1. Ring furnace heating: The tube blank is loaded into the ring furnace from the charging port, placed on the rotary furnace bottom, and driven by the rotary furnace bottom to move from the charging port to the discharging port, and the rotary furnace bottom rotates at a uniform speed , the angular velocity of rotation is 1.73° / min; the steps and processes of heating are as follows:

[0019] (1) Preheating: This step is carried out in the first and second preheating stages. The inner and outer temperatures of the first preheating stage are the same, 1100°C respectively, and the preheat...

Embodiment 2

[0028] Taking the finished product specification as: Φ139.7mm (diameter)×7.72mm (wall thickness) and the steel grade of 30Mn2 as an example, the specification of its core tube blank is: Φ200mm (diameter)×3850mm (length), after perforation The specification of the capillary is Φ227mm (diameter) × 17.2mm (wall thickness) × 1046mm (length). The production steps and processes are as follows:

[0029] 1. Ring furnace heating: The tube blank is loaded into the ring furnace from the charging port, placed on the rotary furnace bottom, and driven by the rotary furnace bottom to move from the charging port to the discharging port, and the rotary furnace bottom rotates at a uniform speed , the angular velocity of rotation is 1.73° / min; the steps and processes of heating are as follows:

[0030] (1) Preheating: This step is carried out in the first and second preheating stages. The inner and outer temperatures of the first preheating stage are the same, 1100°C respectively, and the prehea...

Embodiment 3

[0039] Taking the finished product specification as: Φ244.5mm (diameter)×8.94mm (wall thickness) and the steel grade of 30Mn2 as an example, the specification of its core tube blank is: Φ280mm (diameter)×2750mm (length), after perforation The specification of the capillary is Φ304mm (diameter) × 22.4mm (wall thickness) × 8393mm (length). The production steps and processes are as follows:

[0040] 1. Ring furnace heating: The tube blank is loaded into the ring furnace from the charging port, placed on the rotary furnace bottom, and driven by the rotary furnace bottom to move from the charging port to the discharging port, and the rotary furnace bottom rotates at a uniform speed , the angular velocity of rotation is 1.6° / min; the steps and processes of heating are as follows:

[0041] (1) Preheating: This step is carried out in the first and second preheating stages. The inner and outer temperatures of the first preheating stage are the same, 1100°C respectively, and the preheat...

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Abstract

The invention relates to an annular furnace heating process for hot-rolled tube billet. The annular furnace comprises a furnace body and a rotary furnace bottom. The furnace body consists of six sections, i.e. a preheating section I, a preheating section II, a heating section I, a heating section II, a soaking section I and a soaking section II which are sequentially from a charging opening to a discharging opening. The inner side and the outer side of each section are respectively provided with a set of burners which are controlled by reversing valves. Sequential cyclic burning is carried out according to a determined reversing period and reversing interval. The tube billet is driven by the rotary furnace bottom to move from the charging opening to the discharging opening. The tube billet is discharged out of the furnace after sequentially undergoing preheating, heating and soaking. The head temperature of the hot tube billet coming out of the furnace is lower than the tail temperature thereof, and the temperature difference is controlled to be 30-60 DEG C. Through the reasonable setting of furnace temperature inside and outside the soaking sections and the control of the temperature difference between the head and the tail of the hot tube billet coming out of the furnace, the temperature of the head and the tail of a tubular billet for entering a continuous mill is uniform, thereby providing a better condition for the rolling of the continuous mill and effectively improving the quality and yield of the tubular billet.

Description

technical field [0001] The invention belongs to the technical field of hot rolling production of oil well pipes, and relates to a heating treatment process for hot rolling production of oil well pipes, in particular to an annular furnace heating process for hot rolling pipe blanks. Background technique [0002] At present, the basic process of producing hot-rolled capillaries on the continuous rolling production lines of hot-rolled and restrained mandrels at home and abroad is: tube billet heating - piercing - continuous rolling with continuous rolling mills. The discharge temperature of the tube blank is mainly based on the needs of the continuous rolling mill. If the temperature of the capillary tube entering the continuous rolling mill is too low, the phenomenon of holding the mandrel will occur after continuous rolling, which will make it difficult to remove the rod, and the thin-walled continuous rolling tube will also be pulled. Therefore, it is hoped that the capillar...

Claims

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Application Information

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IPC IPC(8): C21D9/08
Inventor 晏谢飞万立波张毅
Owner WUXI SEAMLESS OIL PIPE
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