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24-30% Mn-containing alloy pipe material and manufacture method thereof

A manufacturing method and pipe technology, applied in the manufacture of tools, earthwork drilling, temperature control, etc., can solve the problems of reduced plasticity and high insecurity, and achieve the effects of high plasticity, low yield ratio, and low yield strength

Active Publication Date: 2011-06-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a certain amount of cold deformation of traditional ferritic pearlite materials, the plasticity will be significantly reduced, and the use is relatively unsafe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Alloy composition: C=0.003%, Mn=27.1%, Si=3.2%, Al=2.8%, P=0.008, S=0.005, N=0.008%, Ti: 0.03%, the rest Fe.

[0023] Manufacturing process: smelting and casting under vacuum conditions, the ingot is subjected to homogenization annealing at 1200°C±20°C for 3 hours, the steel ingot is made into a steel plate after hot rolling, the rolling is started at 1180°C, and the final rolling temperature is 890°C; through the straight seam resistance Welded tube into tube blank. The steel pipe with complete austenitic structure is obtained after the tube blank is solution treated at 1180°C±20°C, and the expandable pipe is made after aging treatment at 350-400°C for 450-550s. Main properties: Yield strength 260MPa, tensile strength 650MPa, yield strength ratio 0.40, uniform elongation 80%, elongation after fracture 95%. After 40% expansion and deformation, the yield strength is 505MPa, the tensile strength is 680MPa, the yield ratio is 0.74, the uniform elongation is 36.3%, and the ...

Embodiment 2

[0025] Alloy composition: C=0.08%, Mn=24.6%, Si=1.9%, Al=1.65%, P=0.008, S=0.003, N=0.007%, Nb=0.06%, Cr=4.3%, Cu=0.2% , the rest Fe.

[0026] Manufacturing process: smelting and casting under vacuum conditions, homogenizing annealing for 4 hours at 1200℃±20℃ for ingots, and hot-rolling the ingots to make seamless pipe billets. The steel pipe with complete austenite structure is obtained after the tube blank is solution treated at 1170°C±20°C, and the expandable pipe is made after aging treatment at 380-430°C for 420-470s.

[0027] Main properties: Yield strength 360MPa, tensile strength 780MPa, yield strength ratio 0.46, uniform elongation 68.0%, elongation after fracture 75.3%. After 35% expansion and deformation, the yield strength is 556MPa, the tensile strength is 814MPa, the yield strength ratio is 0.68, the uniform elongation is 30.1%, and the total elongation is 38.4%. After expansion and deformation, the mechanical properties meet the performance requirements of API...

Embodiment 3

[0029] Alloy composition: C=0.32%, Mn=24.4%, Si=0.5%, Al=1.5%, P=0.007, S=0.004, N=0.008%, Cr=3.3%, Cu=0.4%, V=0.05% , the rest Fe.

[0030] Manufacturing process: smelting and casting under vacuum conditions, homogenizing annealing for 4 hours at 1180°C±20°C for ingots, and hot rolling the ingots to make seamless pipe blanks. The steel pipe with complete austenitic structure is obtained after the tube blank is solution treated at 1160°C±20°C, and the expandable pipe is made after aging treatment at 400-450°C for 400-450s.

[0031] Main properties: Yield strength 382MPa, tensile strength 825MPa, yield ratio 0.46, uniform elongation 64.5%, elongation after fracture 81.3%. After 30% expansion and deformation, the yield strength is 628MPa, the tensile strength is 860MPa, the yield ratio is 0.73, the uniform elongation is 29.3%, and the total elongation is 49.2%. After expansion and deformation, the mechanical properties meet the performance requirements of API 90ksi steel grade...

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Abstract

The invention relates to a 24-30% Mn-containing alloy pipe material and a manufacture method thereof. The pipe material comprises the following components of: 0.001-0.35% of C, 24-30% of Mn, 0-5% of Si, 1.0-3.5% of Al, P which is less than and equal to 0.015%, S which is less than and equal to 0.010%, and Fe in balance amount, or one or two of 1-6% of Cr, 0.1-0.5% of Cu, 0.01-0.9% of Nb, 0.01-0.1% of Ti and 0.01-0.3% of V. The manufacture method comprises the following steps of: vacuum smelting and casting, annealing in a homogenizing way, hot rolling to obtain a steel plate or a bar material, electric resistance welding or hot rolling to obtain a pipe blank, and performing solid solution and aging treatment to obtain the alloy pipe material with good expansibility performance. The even elongation coefficient is more than or equal to 60%, and the yield strength is 250-400MPa. After performing 30-40% of plastic deformation, the even elongation coefficient is more than or equal to 25%, and the yield strength is 500-630MPa.

Description

technical field [0001] The invention relates to an alloy pipe material containing 24-30% Mn for solid expansion pipes in the petroleum and natural gas industry and a manufacturing method thereof. Background technique [0002] Solid expandable casing SET (Solid Expandable Tubular) technology is a new drilling, completion and workover technology that expands the casing string radially to the required diameter in the wellbore for the purpose of "saving" the borehole size. technology. The application of this technology can increase the number of casing layers to be lowered, bringing "revolutionary" impact and significant technical and economic benefits to deep wells, drilling and wellbore structures with complex geological conditions. It can make the wellbore "thin" and significantly reduce the development cost. It makes "single diameter" possible. [0003] The solid expansion sleeve technology is currently monopolized by a few companies, mainly including Weatherford, Baker P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/127C22C38/38B21B37/74C21D9/08
Inventor 冯耀荣上官丰收李德君杨龙刘永刚宋生印
Owner BC P INC CHINA NAT PETROLEUM CORP