Low temperature large wall thickness x80hd large deformation pipeline steel and its production method

A production method and pipeline steel technology, which is applied in the production of low-temperature large-wall thickness X80HD large-deformation pipeline steel and the production of pipeline steel plate and longitudinal welded pipe, which can solve the problems of no design specification and different performance requirements of steel pipes, etc. , to achieve uniform deformation, high uniform elongation, and economical production cost

Active Publication Date: 2016-01-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 earthquake regions, and deep-sea pipeline laying projects. It is a cutting-edge research and development product, and there is currently no Special and complete design specifications, different pipeline projects have different requirements for steel pipe performance

Method used

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  • Low temperature large wall thickness x80hd large deformation pipeline steel and its production method
  • Low temperature large wall thickness x80hd large deformation pipeline steel and its production method
  • Low temperature large wall thickness x80hd large deformation pipeline steel and its production method

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Effect test

Embodiment 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, and the casting speed is 0.80m / min. , and its chemical composition is shown in Table 1. The heating temperature of the slab is 1160°C, and the heating time is 390min; the starting temperature of the rough rolling stage is 1035°C, and the final rolling temperature is 990°C; The secondary reduction rate is 18%-22%; the starting rolling temperature in the finish rolling stage is 835°C, the final rolling temperature is 786°C, and the total reduction rate of the steel plate at this stage is 73.2%; Slowly cool from 786°C to 711°C at a rate of 2°C / s, wait for 66 seconds, and then quickly cool to 360°C at a cooling rate of 21.2°C / s. The transverse properties of the steel plates are shown in Table 2, and the longitudinal properties of the steel plates are shown in Table 3.

[0038]...

Embodiment 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, and the casting speed is 0.80m / min. , and its chemical composition is shown in Table 1. The heating temperature of the slab is 1150°C, and the heating time is 430min; the starting temperature of the rough rolling stage is 1020°C, the final rolling temperature is 1000°C, and the total reduction rate of the longitudinal rolling after the rough rolling is 61.4%. The secondary reduction rate is 18%-22%; the starting rolling temperature in the finish rolling stage is 830°C, the final rolling temperature is 798°C, and the total reduction rate of the steel plate at this stage is 67%; Slowly cool from 798°C to 720°C at a speed of 2°C / s, wait for 72s, then rapidly cool to 340°C at a cooling rate of 19.8°C / s. The transverse properties of the steel plates are shown in Table 2, and the...

Embodiment 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 slab is 350mm, and the casting speed is 0.85m / min. , and its chemical composition is shown in Table 1. The heating temperature of the slab is 1170°C, and the heating time is 340min; the starting temperature of the rough rolling stage is 1030°C, and the final rolling temperature is 1017°C; The secondary reduction rate is 18%-24%; the starting rolling temperature in the finish rolling stage is 840°C, the final rolling temperature is 803°C, and the total reduction rate of the steel plate at this stage is 70%; Slowly cool from 803°C to 733°C at a rate of 2°C / s, wait for 39s, and then quickly cool to 320°C at a cooling rate of 23.7°C / s. The transverse properties of the steel plates are shown in Table 2, and the longitudinal properties of the steel plates are shown in Table 3.

[0044] When the ...

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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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Patent Type & Authority Patents(China)
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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