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In a 1998 study, costs for corrosion in USA were estimated to be about 276 billion US-$. One way to reduce this gigantic amount of money is to use modern stainless steels and nickel alloys with excellent resistance to various forms of corrosion in corrosive environments like seawater, brines, oil and sour gas wells.
In a 1998 study, costs for corrosion in USA were estimated to be about 276 billion US-$. Even if the complete corrosion costs cannot be avoided; corrosion experts think that by choosing the right corrosion control technology including better materials of construction, these costs can be reduced by 25 to 30%[1]. One way to reduce this gigantic amount of money is to use components constructed out of high alloy stainless steels and nickel alloys. Modern stainless steels and nickel alloys have excellent resistance to various forms of corrosion (localized corrosion and stress corrosion cracking) in corrosive environments like seawater, brines, oil and sour gas wells. The corrosion resistance of an alloy is primarily related to its nickel, chromium, molybdenum and nitrogen content. This is often expressed by the so-called PREnumber (Pitting Resistance Equivalent). Higher nickel is beneficial for resisting chloride stress corrosion cracking and sulphide stress corrosion cracking whereas Cr, Mo, W (to lesser degree) and nitrogen contribute to localized corrosion resistance.
Keywords: Oil & Gas, Nickel Alloy, UNS N08926, UNS N08031, UNS N06059, UNS N08825, UNS N06625, UNS N07718, UNS N09925, UNS N05500, Cladding
Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes.
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