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SEAMLESS STEEL PIPE FOR USE AS VERTICAL WORK-OVER SECTIONS

  • US 20100193085A1
  • Filed: 04/17/2008
  • Published: 08/05/2010
  • Est. Priority Date: 04/17/2007
  • Status: Abandoned Application
First Claim
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1. A seamless steel tube for work-over risers comprising in weight percent, carbon 0.25-0.28, manganese 0.48-0.58, silicon 0.20-0.30, chromium 1.05-1.15, molybdenum 0.80-0.83, nickel 0.10 max, nitrogen 0.008 max, boron 0.0016-0.0026, aluminum 0.015-0.045, sulfur 0.0030 max, phosphorus 0.010 max, titanium 0.016-0.026, niobium 0.025-0.030, copper 0.10 max, arsenic 0.020 max, calcium 0.0040 max, tin 0.015 max, hydrogen 2.0 ppm max, the remainder being iron and inevitable impurities;

  • and a geometry in which ends of the tube have an increased wall thickness and outer diameter and having a yield strength of at least 620 MPa (90 ksi) throughout the whole length of a tube body and in tube ends.

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