Plate shape control process for producing pipeline steel based on single-stand steckel mill

A technology for steel coil mills and production pipelines, which is applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as unconsidered flatness control methods, and achieve the effect of reducing flatness problems

Active Publication Date: 2022-05-27
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with the application number 202010237955.4 discloses a X60 pipeline steel plate and its shape control method. It proposes the shape control of X60 grade pipeline steel with a thickness of 14-20mm. method

Method used

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  • Plate shape control process for producing pipeline steel based on single-stand steckel mill

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use 150mm billet to produce L450M pipeline steel with a daughter plate size of 10.3×2580×12000mm, and the number of feet is 5 times. The yield strength of this grade of steel is required to be ≥465MPa. The specific implementation process is as follows:

[0029] (1) Slab heating

[0030] The slab tapping temperature is 1160°C, and the furnace time is 7min / cm.

[0031] (2) high-pressure water descaling;

[0032] The water pressure of the descaling box is ≥23MPa, and the surface temperature of the slab after descaling is between 1030℃.

[0033] (3) Rolling

[0034] Before rolling L450M pipeline steel, 5 pieces of Q355B were produced, the thickness specification was 14.2mm, the width specification was 2900mm, and the finishing temperature was 848℃, 834℃, 845℃, 853℃ and 837℃ respectively.

[0035] The intermediate billet of L450M pipeline steel is set to 35mm, the second-stage rolling is 11 passes, the reduction rate of the penultimate pass is 19.5%, and the reduction ra...

Embodiment 2

[0044] Use 150mm billet to produce L485M pipeline steel with daughter plate specification of 13×2486×12000mm, the multiples of feet are 4 times of feet, and the yield strength of this grade of steel is required to be ≥515MPa. The specific implementation process is as follows:

[0045] (1) Slab heating

[0046] The slab tapping temperature is 1180°C, and the furnace time is 8min / cm.

[0047] (2) high-pressure water descaling;

[0048] The water pressure of the descaling box is ≥23MPa, and the surface temperature of the slab after descaling is between 1040℃.

[0049] (3) Rolling

[0050] Before rolling L485M pipeline steel, 5 pieces of Q345R were produced, the thickness specification was 20.15mm, the width specification was 3100mm, and the finishing temperature was 887℃, 880℃, 877℃, 874℃ and 888℃ respectively.

[0051] The intermediate billet of L485M pipeline steel is set to 45mm, the second-stage rolling is 13 passes, the reduction rate of the penultimate pass is 15%, and ...

Embodiment 3

[0060] Use 150mm billet to produce L450M pipeline steel with a daughter plate size of 14.2×2580×12000mm, and the number of feet is 4 times. The yield strength of this grade of steel is required to be ≥450MPa. The specific implementation process is as follows:

[0061] (1) Slab heating

[0062] The slab tapping temperature is 1200°C, and the furnace time is 9min / cm.

[0063] (2) high-pressure water descaling;

[0064] The water pressure of the descaling box is ≥23MPa, and the surface temperature of the slab after descaling is between 1060℃.

[0065] (3) Rolling

[0066] Before rolling L450M pipeline steel, 5 pieces of Q355B were produced, the thickness specification was 14.2mm, the width specification was 2900mm, and the finishing temperature was 835℃, 837℃, 840℃, 857℃ and 847℃ respectively.

[0067] The intermediate billet of L450M pipeline steel is set to 35mm, the second-stage rolling is 11 passes, the reduction rate of the penultimate pass is 18%, and the reduction rate...

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Abstract

The invention relates to a plate shape control process for producing pipeline steel based on a single-stand steckel mill, and belongs to the technical field of medium plate production. The method comprises the following steps: (1) heating a plate blank; (2) descaling with high-pressure water; (3) rolling; (4) water cooling; (5) hot straightening; (6) cooling by a cooling bed; the rolling is divided into first-stage rolling and second-stage rolling. Parameters of the transition material are limited according to pipeline steel of different steel grades and different specifications, the width specification of the transition material must be larger than the width of the pipeline steel plate, and when the pipeline steel plate is thinner and wider, the finish rolling temperature of the transition material is correspondingly increased, and it is guaranteed that a roller is ironed sufficiently and evenly. The reduction rate is determined according to the total pass amount, and the proper reduction rate can reduce the plate shape problem caused by deformation resistance on the basis of guaranteeing the performance. Through the application of the control method, the unevenness of the pipeline steel plate is lower than 10 mm / m.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate production, and in particular relates to a shape control process for producing pipeline steel based on a single-stand furnace coiling mill. Background technique [0002] In recent years, in order to strengthen the green design concept of steel products and comply with the trend of high steel grade and light weight in the downstream industry, the demand for medium and thick steel plates for high-grade thin-width pipelines has been increasing. The low-carbon microalloy system is produced with controlled rolling and controlled cooling technology, and the shape control under this process condition is difficult. In the process of mass production of high-grade thin and wide specification pipeline steel, the shape of the steel plate at the initial stage of rolling is extremely poor, especially the first steel plate, due to insufficient hot rolls, during the rolling process, even after stra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/00B21B45/08B21B45/02B21B15/00B21B43/00
CPCB21B45/004B21B45/08B21B45/0206B21B15/00B21B43/00Y02P90/02
Inventor 汪鹏飞孔雅朱士鹏徐庆磊房振业李复磊李东岳韩启彪韩力强杨欣兴车金锋陈耀蔡茗宇季伟烨
Owner SD STEEL RIZHAO CO LTD
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