Preparation method for twinning induced plasticity (TWIP) steel for low-cost large-expansibility expansion pipe and steel pipe

An expansion rate, low-cost technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems that cannot meet the expansion tube technology, the expansion force increases, and it is difficult to meet the requirements, so as to improve the fluidity and wettability and the existing form of impurities, improving the cleanliness and improving the effect of anti-corrosion performance

Inactive Publication Date: 2012-07-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the currently used expandable steel pipes include the K55, J55, and L80 casings used in the existing API casing steel pipes and the LSX-80 expandable casing developed by Shell, and even the stainless duplex casing developed in my country in recent years. Steel and TRIP steel expandable pipe sleeves (Xu Ruiping. Research and Development of Expandable Pipe Materials [D]. Master's Degree Thesis of Tianjin University, 2006, 2), while ensuring strength, often have high yield strength and insufficient expansion rate 25%; the problem of material selection for large-scale expansion sleeves above this expansion rate has not been well resolved
Although the yield strength of this kind of steel with TWIP/TRIP effect is only less than 200MPa, the tensile s...

Method used

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  • Preparation method for twinning induced plasticity (TWIP) steel for low-cost large-expansibility expansion pipe and steel pipe
  • Preparation method for twinning induced plasticity (TWIP) steel for low-cost large-expansibility expansion pipe and steel pipe
  • Preparation method for twinning induced plasticity (TWIP) steel for low-cost large-expansibility expansion pipe and steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical composition of TWIP steel for expansion pipe with large expansion rate is: C content 0.32%, Mn content 18.84%, Cr content 0.87%, Al content 0.016%, Si content 0.53%, Re content 0.032%, The P content is 0.0039%, the S content is 0.0018%, and the rest is iron.

[0040] The steel is smelted in an electric furnace, deoxidized by rare earth aluminum-iron alloys, tapped at 1500-1600°C, cast at 1450-1550°C, hot-extruded at 1250-1100°C after blanking, or rolled into seamless steel pipes at 1250-850°C After the steel pipe is air-cooled, or hot-rolled or cold-rolled into a steel plate of a certain thickness, it is made into a welded pipe through high-frequency straight seam welding technology, and finally quenched and water-cooled at 950-1050°C to make an expandable sleeve of a certain specification. The mechanical performance test results are: tensile strength R m : 968.4MPa, yield strength R P0.2 : 316MPa, elongation after fracture A: 59.5%, strong plastic produc...

Embodiment 2

[0046] TWIP steel for expansion pipe with large expansion rate, its chemical composition is as follows: C content 0.45%, Mn content 20.06%, Cr content 0.74%, Al content 0.018%, Si content 0.63%, Re content 0.033%, P content 0.0045%, the S content is 0.0019%, and the rest is iron.

[0047] The steel is smelted in an electric furnace, deoxidized by rare earth aluminum-iron alloys, tapped at 1500-1600°C, cast at 1450-1550°C, hot-extruded at 1250-1150°C after blanking, and finally quenched and water-cooled at 950-1050°C to make a certain specifications of the expandable sleeve. The mechanical performance test results are: tensile strength R m : 878MPa, yield strength R P0.2 : 325MPa, elongation after fracture A: 66.58%, strong plastic product k: 58457MPa%.

Embodiment 3

[0049] TWIP steel for expansion pipe with large expansion rate, its chemical composition is as follows: C content 0.335%, Mn content 19.44%, Cr content 0.42%, Al content 0.015%, Si content 0.69%, Re content 0.031%, P The iron content is 0.0049%, the S content is 0.0018%, and the rest is iron.

[0050]The steel is smelted in an electric furnace, deoxidized by rare earth aluminum-iron alloys, tapped at 1500-1600°C, cast at 1450-1550°C, hot-extruded at 1250-1150°C after billeting, or rolled into seamless steel pipes at 1250-850°C After the steel pipe is air-cooled, or hot-rolled, cold-rolled into a certain thickness of the steel plate and then made into a welded pipe through high-frequency straight seam welding technology, and finally quenched and water-cooled at 950-1050 ° C to make a certain specification of expandable sleeve. The mechanical performance test results are: tensile strength R m : 1065.6MPa, yield strength R P0.2 : 535MPa, elongation after fracture A: 67%, strong...

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Abstract

The invention relates to a preparation method for TWIP steel for a low-cost large-expansibility expansion pipe and a steel pipe. The TWIP steel comprises the chemical components, by weight percentage, 0.30-0.65% of C, 15-30% of Mn, 0.10-1.0% of Cr, 0.01-0.20% of Al, 0.10-1.0% of Si, 0.030-0.30% of Re, S<=0.002%, P<=0.005% and the balance ferrum. Component design is instructed through alloy stacking fault energy, vacuum smelting is conducted, rare earth ferroaluminum is deoxidized, a right amount of Cr and Si elements are added, a small amount of rare earth elements are added, and steel with low content of sulphur and phosphorus and certain grain scale for the large-expansibility expansion pipe is obtained, wherein a base body of the steel is austenite, and the steel has a twinning inducedplasticity effect. The steel is manufactured into large-expansibility large-size expandable casing pipes through hot extrusion.

Description

technical field [0001] The invention belongs to the fields of metal materials and petroleum and natural gas industries, and relates to TWIP steel containing C, Mn and alloying elements Cr, Si and Re. The steel is suitable for making expandable pipes with a large expansion rate. Background technique [0002] Expandable pipe technology (Ma Hongtao. Development and application of foreign expandable pipe technology [J]. Foreign Oilfield Engineering, 2006, 2(22): 20-24) is a mechanical or hydraulic method used in the downhole, through the expansion cone from above Move down or from bottom to top to cause permanent plastic deformation of the casing steel, so that the expanded casing can stick to the well wall. It is an advanced process technology developed in recent years for drilling, completion and workover in the oil and gas industry. Some people also call it the moon landing technology in the field of geosciences in the 21st century. One of the key technologies in the oil and...

Claims

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Application Information

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IPC IPC(8): C22C38/38B21C23/02C21D9/08
Inventor 李春福宋开红何继宁王绍先江屏申文竹杨阳袁静
Owner SOUTHWEST PETROLEUM UNIV
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