Corrosion resistant material
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United States of America Patent
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Jul 20, 2004
Grant Date -
Feb 6, 2003
app pub date -
Aug 12, 2002
filing date -
Jun 30, 2000
priority date (Note) -
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Abstract
A material which is suitable for equipment in oilfield technology and a process for making the material. The material consist essentially of C, Si, Mn, Cr, Mo, Ni, Cu, N in certain weight percentages, with the balance iron and contaminants due to manufacture. The material is hot formed in a condition free of nitride precipitates and without precipitated associated phases. After a cooling, it is cold formed in a condition free of ferrites. The material has certain values of relative magnetic permeability, yield strength (R.sub.p0.2), notched impact strength, fatigue strength under reversed stresses, and fracture appearance transition temperature.
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