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Alloy pipe containing 18-24% of Mn and manufacturing method thereof

A manufacturing method and pipe technology, which are applied to alloy pipes containing Mn18-24% and their manufacturing fields, can solve the problems of high insecurity and reduced plasticity, and achieve the effects of good corrosion resistance, high plasticity and low yield strength.

Active Publication Date: 2010-08-18
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=0.06%, Mn=18.2%, Si=4.1%, Al=2.0%, P=0.005, S=0.0032, N=0.008%, and the rest is Fe.

[0023]Manufacturing process: smelting and casting under vacuum conditions, ingot homogenization annealing at 1200°C for 3 hours, steel ingots are hot-rolled and made into rods; hot-rolled to make seamless tube billets. The steel tube with complete austenite structure can be obtained after the tube blank is solution treated at 1000-1120 °C. Then, aging treatment is carried out at 300-400° C. for 350-450 s to obtain an expandable pipe with more stable structure and properties.

[0024] Mechanical properties: Yield strength before expansion deformation is 320MPa, tensile strength is 830MPa, yield strength ratio is 0.39, uniform elongation is 72%, and elongation after fracture is 85%. After 30% expansion and deformation, the yield strength is 582MPa, the tensile strength is 860MPa, the yield ratio is 0.68, the uniform elongation is 36%, and the elongation after fractur...

Embodiment 2

[0026] Alloy composition: C=0.04%, Mn=20.02%, Si=2.9%, Al=2.8%, P=0.005, S=0.0032, N=0.007%, Cr: 2%; Cu: 0.5%; the rest Fe.

[0027] Manufacturing process: smelting and casting under vacuum conditions, ingot homogenization annealing at 1200°C for 3.5 hours, steel ingots are hot-rolled and made into steel plates; pipes are made by straight seam resistance welding. After the tube blank is solution treated at 1030-1150 °C, a steel tube with a complete austenite structure can be obtained. Subsequently, an aging treatment is carried out at 340-380° C. for 420-480 s to obtain an expandable pipe with more stable structure and properties.

[0028] Mechanical properties: Yield strength before expansion deformation is 340MPa, tensile strength is 920MPa, yield strength ratio is 0.37, uniform elongation is 52%, and elongation after fracture is 67%. After 30% expansion and deformation, the yield strength is 720MPa, the tensile strength is 965MPa, the yield ratio is 0.75, the uniform elong...

Embodiment 3

[0030] Alloy composition: C: 0.10%; Mn: 22%; Si: 4%; Al: 5%; P: 0.03%; S: 0.03%; N=0.006%; Cr: 3.5%; Cu: 0.4%; Ti: 0.1%; balance Fe.

[0031] Manufacturing process: smelting and casting under vacuum conditions, ingot homogenization annealing at 1200 ° C for 4 hours, steel ingots are hot-rolled and made into steel plates; pipes are made by straight seam resistance welding. After the tube blank is solution treated at 1080-1100 °C, a steel tube with a complete austenite structure can be obtained. Then, aging treatment is carried out at 300-340° C. for 410-430 s to obtain an expandable pipe with more stable structure and properties.

[0032] Mechanical properties: Yield strength before expansion deformation is 380MPa, tensile strength is 920MPa, yield strength ratio is 0.41, uniform elongation is 49%, and elongation after fracture is 63%. After 30% expansion and deformation, the yield strength is 773MPa, the tensile strength is 985MPa, the yield ratio is 0.78, the uniform elonga...

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Abstract

The invention relates to an alloy pipe containing 18-24% of Mn and a manufacturing method thereof. The alloy pipe comprises: 0.002-0.2% of C, 18-24% of Mn, 0-4% of Si, 0-5% of Al, no more than 0.015% of P, no more than 0.01% of S, no more than 0.008% of N, or one or more of 1-6% of Cr, 0.1-0.5% of Cu, 0.01-0.6% of Nb, 0.01-0.1% of Ti and 0.01-0.3% of V, and balance of Fe. The manufacturing method comprises the following steps: casting the raw materials by vacuum melting, carrying out homogenizing annealing and hot-rolling on the casted materials so as to be manufactured into steel plates or bars; carrying out resistance-welding or hot-rolling on the steel plates or balls so as to be manufactured into pipe blanks; carrying out solid solution treatment and ageing treatment on the pipe blanks, wherein the obtained product has a uniform elongation percentage no less than 50% and a yield strength of 300-400MPa; and carrying out dilatational strain of 30% on the pipe blanks, wherein the obtained product has the uniform elongation percentage no less than 20%, the yield strength of 560-760MPa and the yield ratio of 0.62-0.80.

Description

technical field [0001] The invention relates to an alloy pipe material containing 18-24% Mn for solid expansion pipes in the oil and 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 Petroleum Tools...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/38C21D1/26
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
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