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110ksi-grade stainless steel oil pipe and manufacture method thereof

A manufacturing method, stainless steel technology, applied in the direction of drill pipe, casing, earthwork drilling, etc., can solve the problems of restricting the application of high-strength pipes, low strength, and reducing the strength of steel, and achieve the effect of excellent corrosion resistance

Active Publication Date: 2016-10-26
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

This is mainly because the microstructure of austenitic stainless steel at room temperature is austenite, with good plasticity and toughness, but low strength, which limits its application in the high-strength pipe industry
Especially for ultra-low carbon austenitic stainless steel, although the lower carbon content is conducive to the improvement of corrosion resistance, it further reduces the strength of the steel itself.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, the mass percentage (wt.%) of each component in this example is: C: 0.010, Si: 0.05, Mn: 1.25, Cr: 18.30, Ni: 9.70, N: 0.12, and the manufacturing method is as follows:

[0031] (1) Smelting: After the molten steel is smelted in an electric furnace, it is VOD refined, and cast into a billet; it is electroslag remelted with argon protection, and the final billet is homogenized and annealed.

[0032] (2) Forging: Heating the steel billet to 1150-1200°C, keeping it warm for 45 minutes, and then forging the steel billet in multiple passes to make a forging billet.

[0033] (3) Tube billet making: peeling, centering and perforating the forged billet to make a tube billet.

[0034] (4) Extrusion and rolling: the tube billet enters the induction furnace to be heated, the heating temperature is 1050-1150 ° C, and the holding time is 30 minutes; the inner and outer surfaces of the tube billet are lubricated with glass powder and then expanded, and extruded on the extr...

Embodiment 2

[0041] Example 2, the mass percentage of each component in this example is: C: 0.012, Si: 0.04, Mn: 1.20, Cr: 18.10, Ni: 9.85, N: 0.15, and the manufacturing method is as follows:

[0042](1) Smelting: After the molten steel is smelted in an electric furnace, it is VOD refined, and cast into a billet; it is electroslag remelted with argon protection, and the final billet is homogenized and annealed.

[0043] (2) Forging: Heating the steel billet to 1150-1200°C, holding the temperature for 40 minutes, and performing multi-pass forging on the steel billet to make a forging billet.

[0044] (3) Tube billet making: peeling, centering and perforating the forged billet to make a tube billet.

[0045] (4) Extrusion and rolling: the tube billet enters the induction furnace to be heated, the heating temperature is 1000-1100 ° C, and the holding time is 25 minutes; the inner and outer surfaces of the tube billet are lubricated with glass powder and then expanded, and extruded on the ext...

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PUM

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Abstract

The invention discloses a 110ksi-grade stainless steel oil pipe and a manufacture method thereof. The 110ksi-grade stainless steel oil pipe consists of the following chemical components in a percent by mass: smaller than or equal to 0.02 of C, smaller than or equal to 0.20 of Si, 1.00-1.50 of Mn, 18-20 of Cr, 9-12 of Ni, 0.1-0.3 of N and the balance of Fe and trace impurity elements, and the 110ksi-grade stainless steel oil pipe is finally obtained after the chemical components are treated by the procedures of smelting, forging, pipe blank making, extrusion and rolling, solid solution treatment, cold deformation, heat treatment, non-destructive detection and pipe end machining. The yield strength Rp0.2 of the 110ksi-grade stainless steel oil pipe is 758-828MPa, the tensile strength Rm is larger than 862MPa, and the elongation A50 is larger than 12%. The 110ksi-grade stainless steel oil pipe meets the requirements of API Spec 5CT standards on 110ksi strength grade and is suitable for meeting the requirements of deep and superdeep wells and oil wells in severe corrosive environments.

Description

Technical field: [0001] The invention belongs to the fields of metal materials and oil and gas industries, and relates to a 110ksi grade stainless steel oil pipe and a manufacturing method thereof. Background technique: [0002] With the development of the oil and gas industry, oil and gas exploration is developing in the direction of increasing depth and increasingly complex and harsh corrosive environments. Some deep wells and ultra-deep wells will also appear. These deep-ultradeep wells usually contain CO 2 、H 2 S and Cl - High-temperature and high-pressure and ultra-high-temperature and high-pressure wells. This puts forward higher requirements for oil well tubing, that is, it should have excellent corrosion resistance while having high strength and high toughness. Traditional ordinary carbon steel and low Cr alloy steel can no longer meet the requirements. Due to the relatively low C content of ultra-low carbon austenitic stainless steel, the material itself does ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/40B23P15/00E21B17/00
CPCB23P15/00C22C38/001C22C38/02C22C38/04C22C38/40E21B17/00
Inventor 黄文克毕宗岳张峰韦奉白鹤杨晓龙徐凯周新义
Owner BC P INC CHINA NAT PETROLEUM CORP
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