Ultra-fine grained steels having corrosion-fatigue resistance

a technology corrosion resistance, which is applied in the field of ultra-fine grained steels, can solve the problems of reducing the fatigue life of components, no longer valid, and common failure mechanism of sucker rod fatigu

Inactive Publication Date: 2016-10-20
TENARIS CONNECTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0058]In some embodiments, the steel composition can comprise 0 to 0.05 wt. % vanadium, and 0 to 0.2 wt. % nickel. In some embodiments, the difference between PA and PT can be less than 100

Problems solved by technology

Due to the alternating movement of the system, fatigue is a common failure mechanism of sucker rods in service.
However, under the effect of a harsh environment, which very frequently occurs in oil wells, the correlation may no longer be valid because the presence of hydrogen sulfide (H2S), carbon dioxide (CO2), chlorides, and other compounds in aqueous solution

Method used

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  • Ultra-fine grained steels having corrosion-fatigue resistance
  • Ultra-fine grained steels having corrosion-fatigue resistance
  • Ultra-fine grained steels having corrosion-fatigue resistance

Examples

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examples

[0144]The below examples illustrate the fatigue corrosion performance of a steel manufactured from embodiments of the above disclosure as compared to other chemical compositions or manufacturing routes.

[0145]Ultra-fine grain steels (UFGS), such as those described above, were manufactured at industrial scale complying with the following equations in order to investigate the effect of different elements and the performance of each steel chemical composition under different conditions (all UFGS steels and Set A):

0.2%

0.15%

[0146]Billets with an outside diameter of 148 mm were produced in a vertical continuous casting machine. Billets were heated up to 1270° C. and hot rolled to diameters ranging from 19 up to 32 mm.

[0147]Bars were then subjected to a fast induction heating reaching a target temperature of about 900° C. in about 4 seconds in the whole section, held at temperature for about 4 seconds and quenched in water down to below 100° C...

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Abstract

Embodiments of an ultra-fine-grained, medium carbon steel are disclosed herein. In some embodiments, the ultra-fine grained steel can have high corrosion fatigue resistance, as well as high toughness and yield strength. The ultra-fine grained steels can be advantageous for use as sucker rods in oil wells having corrosive environments.

Description

BACKGROUND[0001]1. Field[0002]Embodiments of the present disclosure relate to ultra-fine grained steels which can have excellent toughness and high fatigue resistance in corrosive environments.[0003]2. Description of the Related Art[0004]A sucker rod is a steel solid bar, typically between 25 and 30 feet in length, upset and threaded at both ends, used in the oil and gas industry to connect components at the surface and the bottom of a well. Sucker rods can be used in, for example, reciprocating rod lifts and progressive cavity pumping systems. Due to the alternating movement of the system, fatigue is a common failure mechanism of sucker rods in service.[0005]Typically, there can be a strong correlation between fatigue strength and tensile strength for steels up to about 170 ksi. However, under the effect of a harsh environment, which very frequently occurs in oil wells, the correlation may no longer be valid because the presence of hydrogen sulfide (H2S), carbon dioxide (CO2), chlo...

Claims

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Application Information

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IPC IPC(8): E21B17/00C21D9/00C21D6/00C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C38/02C22C38/00C21D8/06
CPCE21B17/00C22C38/001C21D9/0075C21D6/002C21D6/004C21D6/005C21D6/008C22C38/54C22C38/50C22C38/48C22C38/46C22C38/44C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C38/02C22C38/002C21D8/065
Inventor BUHLER, MARTINPEREYRA, MATIAS GUSTAVO
Owner TENARIS CONNECTIONS
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