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Q420 large angle steel producing and processing technology

A processing technology and angle steel technology, which is applied in the field of large-scale angle steel production and processing technology for transmission line towers, can solve the problems such as the inability to guarantee the mechanical properties of the angle steel to the maximum extent, the low precision of the production and processing technology, and the existence of positive and negative deviations. The effect of good verticality of the cut surface and less damage

Inactive Publication Date: 2014-07-30
CSG EHV POWER TRANSMISSION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing Q235 and Q345 angle steels have small specifications, and the precision of the production and processing process is low. There are positive and negative deviations allowed in the angle steel rolling, and the mechanical properties of the angle steel cannot be guaranteed to the maximum extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The content of the present invention will be further described below in conjunction with the embodiments.

[0016] The large-scale high-strength angle steel processed by the present invention is Q420B, including L220X16, L220X18, L220X20, L220X22, L220X24, L220X26, L250X18, L250X20, L250X24, L250X26, L250X28, L250X30, L250X33, L250 and other steel angles. Equilateral angle steel adopts butterfly pass system, rolling 10 to 12 passes according to different specifications, and the finished product adopts open type to enhance its commonality. The rolling mechanism of angle steel passes with different side lengths is as follows:

[0017] The equilateral angle steel with a side length of 220mm is divided into two sets of thick and thin systems, one with a thickness of 16-22mm, and one with a thickness of 22-26mm; the rolls of the Φ850 rolling mill and the finished rolling mill are shared, and the passes are separated from K5 to K2, that is, the first pass of the Φ800 rolling ...

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PUM

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Abstract

The invention relates to the processing technology of high-strength angle steel, and provides a Q420 large angle steel producing and processing technology capable of improving the precision of finished angle steel products and ensuring the mechanical properties of the finished angle steel products to the maximum extent. The producing and processing technology comprises the following steps: (1) selecting 220*160, 280*170, 300*200 or 360*240 billets to enter a furnace for heating; (2) rough rolling and finish rolling the billets by using a phi 850 mill and a phi 800 respectively, and rolling 10 to 12 passes in accordance with a butterfly pass system; (3) cutting the finished product with a hot saw into equilateral angle steel with a side length of 220mm to 250mm and a thickness of 16mm to 35mm; (4) the angle steel adopting a saw belt type sawing machine to blank; (5) drilling holes in the angle steel. The processed angle steel of large specification has a side length of 220mm to 250mm and a thickness of 16mm to 35mm, and no positive or negative deviation of angle steel rolling exists, so that the use strength of the angle steel is effectively ensured; the saw belt type sawing machine is used for blanking, so that the steel components at the end head of the angle steel are less damaged; the angle steel is drilled to make holes, so that the precision of the finished angle steel product is effectively improved.

Description

technical field [0001] The invention relates to the processing technology of high-strength angle steel, in particular to a production and processing technology of large-size angle steel for transmission line iron towers. Background technique [0002] For a long time, the steel materials used in my country's transmission line towers are limited to two strength grades of Q235 and Q345, and the maximum specification of angle steel is L200X24. Compared with developed countries, there are fewer varieties and lower strength values. Angle steels exceeding the L200X24 specification need to use double-angle steel composite sections. The existing Q235 and Q345 angle steels have small specifications, low production and processing precision, plus and minus deviations are allowed in the angle steel rolling, and the mechanical properties of the angle steel cannot be guaranteed to the maximum extent. Contents of the invention [0003] The invention provides the production and processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/06
CPCB23P13/02
Inventor 鲁景星俞彦黄昆任成林李俊华黄宇舒礼臣胡蓉蔡永梁付诗禧王勇黄文泽王国龙张延镇辜良雨肖兵肖洪伟邱成波
Owner CSG EHV POWER TRANSMISSION