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Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate

A technology of X65-X80 and manufacturing method, applied in the field of low-alloy high-strength steel manufacturing, can solve the problems of insufficient cooling strength at the center of thickness, low carbon content, uneven performance of steel plates, etc., to meet the requirements of yield and tensile strength, high yield and Tensile strength, the effect of solving the problem of hardenability

Inactive Publication Date: 2015-03-11
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Chinese patent application number is the document of 2009100624381, which discloses "a steel plate with a tensile strength of 570MPa grade bending pipe and its production method" in the invention that mentions a A kind of hot-rolled steel plate with tensile strength ≥ 570MPa and toughness -20°C AKV ≥ 170J required by X65 grade LSAW hot-simmering pipe and its production method, the composition of which contains Mo (0.08-0.148%), the cost is high; in addition, its invention is a hot-rolled steel coil, which needs to be coiled in the production process, so it cannot be applied to large-diameter thick-sized wide and thick plates for hot-bending pipes
[0017] Chinese patent application number is 2013107307514, the invention of "a kind of hot-rolled flat plate for X65 hot-simmering bent pipe and its production method" disclosed a A X65 hot-rolled flat plate for hot-simmering pipe bending and its production method, the carbon content in its composition is low (0.02-0.05%), and its thermal stability is poor, so it may not be able to adapt to the high-temperature hot-simmering pipe bending process
[0018] Chinese patent application number is the document of 2014102408250, which discloses "a kind of hot-rolled flat plate for X70 bent pipe with excellent toughness and its production method", and its production The process is to adopt ACC laminar flow cooling after rolling. This cooling process is easy to cause uneven cooling for wide and thick plates, and the cooling strength in the center of the thickness is not enough, resulting in uneven surface and core structures of steel plates with a thickness greater than 30mm, resulting in steel plates. performance non-uniformity
[0020] and the processes of the above two patent applications do not involve the cold-bending formability of steel plates, and the cooling after rolling is ACC cooling method, for steel plates with a thickness greater than 30mm Insufficient cooling strength at the center of the thickness leads to inhomogeneity of the surface and core structure of the steel plate, resulting in uneven performance of the steel plate

Method used

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  • Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate
  • Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate
  • Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] A 33mm × 3762mm × 12000mm X65 grade wide and thick steel plate for hot bending pipes, its components and weight percentages are: C: 0.070%, Si: 0.18%, Mn: 1.48%, P: 0.006%, S: 0.001% , Nb: 0.03%, V: 0.04%; Cr: 0.15%; Ti: 0.015%, Al: 0.035%, N: 0.005%, the rest is Fe and unavoidable impurities; its carbon equivalent CE IIW =0.36, welding crack sensitivity coefficient CE Pcm =0.162.

[0091] Follow the steps below to produce:

[0092] 1) Raw materials are prepared according to the composition ratio, and the molten iron is blast furnace molten iron, and high-quality steel scrap is added;

[0093] 2) The blast furnace hot metal is pretreated by KR hot metal;

[0094] 3) Entering into a 210-ton converter for smelting, blowing oxygen for decarburization and dephosphorization, and controlling the end point of molten steel S ≤ 0.0008%, P ≤ 0.006%;

[0095] 4) Refining outside the LF furnace, deep desulfurization, adding Nb iron, and fine-tuning the composition according to ...

Embodiment 2

[0109] A 37.9mm × 3750mm × 12000mm X70 grade wide and thick steel plate for hot-simmering bent pipes, its components and weight percentages are: C: 0.065%, Si: 0.20%, Mn: 1.55%, P: 0.007%, S: 0.001%, Nb: 0.04%, V: 0.04%; Cr: 0.20%; Mo: 0.15%, Ni: 0.15%, Ti: 0.016%, Al: 0.035%, N: 0.005%, the rest is Fe and unavoidable Impurities; their carbon equivalent CE IIW =0.41, welding crack sensitivity coefficient CE Pcm =0.176.

[0110] Follow the steps below to produce:

[0111] 1) Raw materials are prepared according to the composition ratio, and the molten iron is blast furnace molten iron, and high-quality steel scrap is added;

[0112] 2) The blast furnace hot metal is pretreated by KR hot metal;

[0113] 3) Entering into a 210-ton converter for smelting, blowing oxygen for decarburization and dephosphorization, and controlling the end point of molten steel S ≤ 0.0008%, P ≤ 0.006%;

[0114] 4) Refining outside the LF furnace, deep desulfurization, adding Nb iron, and fine-tun...

Embodiment 3

[0128] A 33mm×3760mm×12000mm X80 grade wide and thick steel plate for hot-simmering and bending pipes, the components and weight percentages of which are: C: 0.070%; Si: 0.23%; Mn: 1.65%; P: 0.007%; S: 0.001% ; Nb: 0.05%; Cr: 0.20%; Mo: 0.20%; Ni: 0.18%; Ti: 0.017%; Al: 0.035%; N: 0.005%, the rest is Fe and inevitable impurities; its carbon equivalent CE IIW =0.437, welding crack sensitivity coefficient CE Pcm =0.187.

[0129] Follow the steps below to produce:

[0130] 1) Raw materials are prepared according to the composition ratio, and the molten iron is blast furnace molten iron, and high-quality steel scrap is added;

[0131] 2) The blast furnace hot metal is pretreated by KR hot metal;

[0132] 3) Entering into a 210-ton converter for smelting, blowing oxygen for decarburization and dephosphorization, and controlling the end point of molten steel S ≤ 0.0008%, P ≤ 0.006%;

[0133] 4) Refining outside the LF furnace, deep desulfurization, adding Nb iron, and fine-tunin...

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Abstract

The invention relates to a wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and a manufacturing method of the wide and thick steel plate. Especially, proper ingredients, structures and technologies for the steel plate for the elbow pipes at X65, X70 and X80 levels are designed respectively according to different pipe bending technologies of pipe bending factories, and the pipeline steel performance requirement for reaching the related strength levels after hot bending of the pipes is met. The steel plate is 20-40 mm thick and 2,500-4,000 mm wide, the hot-rolled steel plate with excellent toughness, thermal formability and thermal stability is obtained, a solution is provided for steel plates for high-pressure elbow pipes in long delivery pipeline projects, and the usage security of the high-level pipeline steel plate is improved.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel manufacturing, and relates to a hot-rolled steel plate of X65, X70 and X80 grades for bending pipes in oil and gas pipelines and a manufacturing method thereof. Background technique [0002] With the vigorous development of my country's oil and gas pipelines, submarine crude oil and coal-water slurry and other fluid pipeline construction projects, an average of 3.5-4 million tons of pipelines are required per year, and oil and gas pipelines pass through many complex terrains and harsh weather conditions. Therefore, a large number of high-pressure bent pipes need to be used in pipeline laying, and the annual market demand is maintained at about 500,000 tons, which has a broad market prospect. [0003] The curved pipe in the pipeline, commonly known as the "waist" of the pipeline, can change the direction of the pipeline according to the needs; secondly, it can buffer the pull, ...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C22C38/58C22C38/50C22C33/04C21D8/02
CPCC22C38/38C21D8/0226C22C33/04C22C38/001C22C38/02C22C38/04C22C38/18C22C38/24C22C38/26C22C38/28C22C38/40C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 夏佃秀刘晓东孙风晓牛延龙韩启彪孔雅李永亮霍自美黄伟王福同
Owner SHANDONG IRON & STEEL CO LTD
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