Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof

A technology for large deformation and pipeline steel, which is applied in the production of medium and thick plates and longitudinal submerged arc welded pipes. It can solve the problems of no design specifications and different performance requirements of steel pipes, and achieve uniform deformation, high uniform elongation, and production The effect of cost economy

Active Publication Date: 2014-03-12
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Large-deformation pipeline steel based on strain design is mainly used in the conditions of large plastic deformation caused by ground liquefaction and settlement caused by pipelines passing through permafrost regions, ground landslide deformation in eart

Method used

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  • Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof
  • Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof
  • Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0036] Example 1

[0037] The thickness of the steel plate is 26.4mm, the width of the steel plate is 3740, the corresponding steel pipe specification is Φ1219*26.4mm, the thickness of the continuous casting billet is 400mm, the drawing speed is 0.80m / min, the dynamic soft reduction technology is adopted during smelting, and the segregation of the cast billet is C 0.5 , Its chemical composition is shown in Table 1. The heating temperature of the slab is 1160℃, and the heating time is 390min; the initial rolling temperature of the rough rolling stage is 1035℃, the final rolling temperature is 990℃, the total rolling reduction rate after rough rolling and widening is 63.5%, and the last three passes are single pass The secondary reduction rate is 18%-22%; the start-rolling temperature of the finishing rolling stage is 835℃, and the final rolling temperature is 786℃. The total steel reduction rate of this stage is 73.2%; the relaxation phase transformation control stage, the steel p...

Example Embodiment

[0039] Example 2

[0040] The thickness of the steel plate is 27.5mm, the width of the steel plate is 3740, the corresponding steel pipe specification is Φ1219*27.5mm, the thickness of the continuous casting billet is 400mm, the drawing speed is 0.80m / min, the dynamic soft reduction technology is adopted during smelting, and the segregation of the cast billet is C 0.5 , Its chemical composition is shown in Table 1. The heating temperature of the slab is 1150℃, the heating time is 430min; the opening temperature of the rough rolling stage is 1020℃, the final rolling temperature is 1000℃, the total rolling reduction rate after rough rolling and widening is 61.4%, and the last three passes are single pass The secondary reduction rate is 18%-22%; the start-rolling temperature of the finishing rolling stage is 830℃, and the final rolling temperature is 798℃. The total steel reduction rate at this stage is 67%; the relaxation phase transformation control stage, the steel plate is 1 At...

Example Embodiment

[0042] Example 3

[0043] The thickness of the steel plate is 23.7mm, the width of the steel plate is 3745, the corresponding steel pipe specification is Φ1219*23.7mm, the thickness of the continuous casting billet is 350mm, the drawing speed is 0.85m / min, the dynamic soft reduction technology is used during smelting, and the segregation of the cast billet is C 0.5 , Its chemical composition is shown in Table 1. The heating temperature of the slab is 1170℃, and the heating time is 340min; the initial rolling temperature of the rough rolling stage is 1030℃, the final rolling temperature is 1017℃, the total rolling reduction rate after rough rolling and widening is 64.2%, and the last three passes are single pass The secondary reduction rate is 18%-24%; the start-rolling temperature of the finishing rolling stage is 840℃, the final rolling temperature is 803℃, and the total steel reduction rate of this stage is 70%; the relaxation phase transformation control stage, the steel plate...

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Abstract

The invention discloses low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and a production method thereof, belonging to the technical field of medium-thickness plate production and longitudinal submerged arc welded tube production. A steel plate comprises the following chemical components in percentage by mass: not less than 0.04% and not greater than 0.09% of C, not greater than 0.35% of Si, not less than 1.5% and not greater than 1.85% of Mn, not greater than 0.012% of P, not greater than 0.004% of S, not less than 0.02% and not greater than 0.05% of Nb, not less than 0.008% and not greater than 0.025% of Ti, not less than 0.10% and not greater than 0.50% of Ni, not less than 0.10% and not greater than 0.45% of Cr, not less than 0.10% and not greater than 0.30% of Cu, not less than 0.10% and not greater than 0.35% of Mo, not less than 0.020% and not greater than 0.070% of Alt, not greater than 0.0005% of B, not greater than 0.0050% of Ca, and the balance of Fe and inevitable impurities. A preparation method of the steel plate comprises the processes such as converter smelting, external refining, continuous casting, heating, controlled rolling, relaxation phase change control and quick cooling; a texture of the rolled steel plate is ferrite, bainite and a little M/A (Martensite/Austenite), wherein ferrite content is 60%-85%, and bainite and M/A content is 15%-40%. The obtained X80HD large-deformation pipeline steel has high strength and toughness, a high work-hardening index, high uniform ductility, a low yield ratio and good deformation resistance.

Description

technical field [0001] The invention belongs to the technical field of plate production and longitudinal submerged arc welded pipe production, and in particular relates to a low-temperature large-wall thickness X80HD large-deformation pipeline steel and a production method thereof, which are suitable for high-strength toughness, low yield ratio, Production of pipeline steel plates and longitudinally welded pipes with good deformation resistance and good weldability. Background technique [0002] With the increasing demand for oil and natural gas resources, the exploitation of oil and gas fields in the world is developing towards remote deserts, seismic zones, polar tundra and oceans and other harsh environments, and the pipelines are inevitably subjected to complex and changeable geological disaster environments , seriously affecting the safe operation of the pipeline. In order to ensure the economy and safety of pipeline construction and operation, the development trend of...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C22C38/50C21D8/02
Inventor 查春和李少坡李家鼎丁文华李群姜中行张国栋谌铁强郝宁陈霞李永东许晓东白学军麻庆申
Owner SHOUGANG CORPORATION
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