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Thin gauge pipeline steel rolling method

A pipeline steel and thin-gauge technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of increased production cost, low production efficiency, deformation of steel plates, etc., to reduce the temperature drop rate and improve production efficiency , the effect of high furnace temperature

Active Publication Date: 2017-11-21
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional thin-gauge pipeline steel production process is: hot metal pretreatment-converter smelting-LF refining-RH vacuum degassing-continuous casting machine continuous casting-continuous casting slab heating-rough rolling-finish rolling-relaxation-air cooling-straightening; When the thin-gauge pipeline steel is subjected to controlled cooling after rolling, the requirements for the temperature of the water entering and the red return temperature are very strict. After watering, the steel plate is seriously bent. After cooling, the steel plate is still deformed, and some steel plates need to be straightened by cold straightening, which increases the production cost and reduces the production efficiency

Method used

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  • Thin gauge pipeline steel rolling method
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  • Thin gauge pipeline steel rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The production pipeline steel L450M has a dimension of 11×2495×12000mm, and the selected blank size is 200×1450×3000mm. Its melting composition is as follows:

[0022] Melting composition of pipeline steel L450M

[0023]

[0024] 1. The temperature of the heating section is 1170-1240°C; the temperature of the soaking section is 1180-1220°C, the time of the soaking section is 60-80min, and the total time in the furnace is 4-6 hours.

[0025] 2. Rolling process requirements

[0026] a) Before rolling the pipeline steel, modify the thickness of the finish rolling mill to 32mm; adjust the torque of the rough rolling mill to 3600kN·M, and the reduction rate of one pass is 24% during rough rolling and cross rolling, and the reduction rate of two single passes during longitudinal rolling 26%;

[0027] b) After the rough strip is rolled for 6 passes, it is passed to the finish rolling mill for 1 pass, and then it is waited for a second time after the finish rolling mill; ...

Embodiment 2

[0036] The pipeline steel L415M produced has a size specification of 10.5×2500×12000mm, and the selected blank size is 200×1450×3000mm. Its melting composition is as follows:

[0037] Melting composition of pipeline steel L415M

[0038]

[0039] 1. The temperature of the heating section is 1170-1240°C; the temperature of the soaking section is 1180-1220°C, the time of the soaking section is 60-80min, and the total time in the furnace is 4-6 hours.

[0040] 2. Rolling process requirements

[0041] a) Before rolling the pipeline, modify the thickness of the finish rolling mill to 31mm; adjust the torque of the rough rolling mill to 3600kN M, and the reduction rate of one pass is 22% during rough rolling and cross rolling, and the reduction rate of two single passes during longitudinal rolling is 27 %;

[0042] b) After the rough strip is rolled for 6 passes under load, carry out a secondary warm-up before the finish rolling mill;

[0043] c) The second start of rolling st...

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Abstract

The invention relates to a thin gauge pipeline steel rolling method. In the steel, the content of C is within 0.05 percent; the content of Ni is 0.05 to 0.06 percent; the content of Ti is 0.01 to 0.02 percent; the content of B is 0.015 to 0.002 percent; the soaking temperature during rolling is 1,180 to 1,220 DEG C; the soaking time is 45 to 100 minutes; the torque of a roughing mill is 3,500 to 3,600 kN.m; the compression ratio is controlled to be 5 to 20; the width spread ratio is controlled to be 1.25 to 2.0; rough rolling is performed within 50 seconds after steel is discharged from a furnace; in rough rolling, the pressing down ratio of at least one pass is ensured not to be less than 21 percent when transverse rolling is performed, and the single pass pressing down ratio of at least two passes is ensured not to be less than 25 percent when longitudinal rolling is performed; and the temperature reducing speed is within 60 DEG C. According to the method, a controlled cooling link after the steel is rolled is cancelled by regulating chemical components of pipeline steel and heating; the type of a steel plate is improved; the production efficiency is greatly improved; and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a thin-gauge pipeline steel rolling method. Background technique [0002] Conventional thin-gauge pipeline steel production process is: hot metal pretreatment-converter smelting-LF refining-RH vacuum degassing-continuous casting machine continuous casting-continuous casting slab heating-rough rolling-finish rolling-relaxation-air cooling-straightening; When the thin-gauge pipeline steel is subjected to controlled cooling after rolling, the requirements for the temperature of the water entering and the red return temperature are very strict. After watering, the steel plate is seriously bent. After cooling, the steel plate still has deformation phenomenon, and some steel plates need to be turned to cold leveling for straightening, which increases the production cost and reduces the production efficiency. Contents of the invention [0003] The invention provides a thin-gaug...

Claims

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Application Information

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IPC IPC(8): B21B1/38B21B37/00C22C38/04C22C38/02C22C38/08C22C38/14C22C38/12
CPCB21B1/38B21B37/00B21B2001/386C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/32
Inventor 肖青松应传涛王若钢李新玲潘凯华罗军李靖年乔馨丛津功李黎明
Owner ANGANG STEEL CO LTD
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