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Hole type system and rolling process for super large diameter round steel production

A round steel rolling, super-large diameter technology, applied in the field of super-large diameter round steel production pass system and rolling process, can solve the problems of low production efficiency and high production cost, achieve straightness guarantee, improve dimensional accuracy and surface quality , the effect of reducing production costs

Inactive Publication Date: 2013-08-14
YANGZHOU CHENGDE HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of the existing technology are: usually the finished product rate is only 70-75%, the production efficiency is low, and the production cost is high

Method used

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  • Hole type system and rolling process for super large diameter round steel production
  • Hole type system and rolling process for super large diameter round steel production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment describes the pass design and rolling process for the production of Φ660mm super large diameter round steel. The complete process is: steel billet-heating-flat hexagonal pass 1 rolling-octagonal pass 2 extension rolling-finished round Pass type 3: finishing rolling-straightening-cooling-slitting-finishing-storage. In this embodiment, an octagonal prism billet with a diagonal length of 1010mm is selected, the material of the billet is P91, the diameter of the round steel produced is Φ660mm, the diameter of the roll used is 1500mm, the speed of the roll is 15rpm, and the initial rolling temperature of the billet is about 1250°C . For the design of each pass on the roll, please refer to the attached figure 1 , and its relevant parameters are:

[0023] Flat hexagon pass pattern 1: the total length of the pass pattern L=1250mm; the length of the bottom edge of the pass pattern L1=700mm; the depth of the groove H1=330mm; the radius of the excessive arc r1=90...

Embodiment 2

[0035] This embodiment describes the roll design and rolling process for the production of Φ600mm super large diameter round steel. The complete process is: steel billet-heating-flat hexagonal pass 1 rolling-octagonal pass 2 elongation rolling-finished round hole Type 3 Finish rolling - Straightening - Cooling - Slitting - Finishing - Storage. In this embodiment, an octagonal steel billet with a diagonal length of 1010 mm is selected, and the material of the billet is P22. In this embodiment, the diameter of the roll used is 1500mm, the rotation speed is 30rpm, and the initial rolling temperature of the billet is about 1250°C. For the design of each pass on the roll, please refer to the attached figure 1 , and its relevant parameters are:

[0036] Flat hexagon pass pattern 1: total pass length L=1212mm; pass bottom edge length L1=630mm; groove depth H1=240mm; excessive arc radius r1=60mm.

[0037] Octagonal hole type 2: side length L2 = 250mm; transition arc radius r2 = 60m...

Embodiment 3

[0045] This embodiment describes the roll design and rolling process for the production of Φ350mm super large diameter round steel. The complete process is: steel billet-heating-flat hexagonal pass 1 rolling-octagonal pass 2 elongation rolling-finished round hole Type 3 Finish rolling - Straightening - Cooling - Slitting - Finishing - Storage. In this embodiment, an octagonal prism steel billet with a diagonal length of 1010mm is still selected, the material of the billet is P22, the diameter of the roll used is 1500mm, the rotational speed of the roll is 15rpm, and the initial rolling temperature of the billet is about 1250°C. For each pass system on the roll, please refer to the attached figure 1 , and its relevant parameters are:

[0046] Flat hexagon pass pattern 1: the total length of the pass pattern L=1230mm; the length of the bottom edge of the pass pattern L1=660mm; the depth of the groove H1=150mm; the radius of the excessive arc r1=35mm.

[0047] Octagonal hole ty...

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Abstract

The invention provides a hole type system and a rolling process for super large diameter round steel production. In the hole type system, three hole types are designed on a pair of rollers, and the three hole types are a flat hexagonal hole type 1, an octagonal hole type 2 and a round hole type 3. The rolling process comprises the following steps: rolling a steel billet with the flat hexagonal hole type 1 and the rolling reduction is 20-90 mm / pass; rolling the billet rolled from the previous step with the octagonal hole type 2, firstly turning the billet 90 degrees with a manipulator, and then placing the billet into the rollers for rolling, wherein the rolling reduction is 30-85 mm / pass; and carrying out finish rolling the billet rolled from the previous steps with the round steel hole type 3, and the rolling reduction is less than or equal to 50 mm / pass. During the three steps, the billet is turned 90 degrees between each two passes. The hole type system and the rolling process provided by the invention have the following advantages: the billet can be rolled to a required dimension through one-time heating with just one large mill; the production process is simple; and the production efficiency is 5 times higher, the production cost is reduced by 50%, and the rolling yield can be increased by 20% through using the rolling process.

Description

technical field [0001] The invention relates to a production pass system and a rolling process for super large-diameter round steel. Background technique [0002] For the production of large bars or round steel with a diameter greater than Φ350mm, the forging method must be used according to the traditional production process, and according to the performance requirements of the metal material, generally more than two times of heating are required before forming, especially for products with higher performance requirements. The following production process: [0003] Press pliers (including cutting bottom, cutting handle, cutting shoulder) - chamfering - (rounding) - upsetting - heating - pulling square - octagonal - heating - pulling length (round) - card step (segmented groove) - pulling Long-finish, correct-cut. [0004] The disadvantages of the existing technology are: usually the finished product rate is only 70-75%, the production efficiency is low, and the production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/02B21B37/58B21B1/08
Inventor 徐国荣范国君
Owner YANGZHOU CHENGDE HEAVY IND CO LTD
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