stress corrosion cracking

The strength level in age hardened materials is becoming widely important, specifically for offshore applications that are exploiting high pressure deep well reserves, where weight factors can significantly affect the economic feasibility of the project. The material selection for down hole and wellhead equipment like hangers, sub surface safety valves, pumps etc should be made … Continue reading Inconel alloys for application in offshore plant conditions for economical service

Hastelloy C276 is today known as a universally corrosion resistant material and is used in various environments from moderately oxidizing to strong reducing conditions. The limiting factor when dealing with strong oxidizing environments is the low Cr content which indicates that hot and concentrated nitric acid environments are not required. This alloy has exceptional resistance … Continue reading Hastelloy C276 Bar- Highly useful in aggressive environments

Inconel 625 is a nickel-chromium-molybdenum alloy that is popular for its high strength, good fabricability and excellent corrosion resistance. Its outstanding corrosion resistance properties increase the alloy’s demand in a wide range of applications that involve high temperature and corrosive environments. High alloy content of Inconel 625 enables it to withstand diverse severely corrosive conditions. … Continue reading Inconel 625- A versatile corrosion resistant material for chemical plants

Inconel 718 is sensitive to stress corrosion cracking in hot waters, in caustic solutions and in hot chloride solutions, comprising of hydrogen sulfide or acids. Many stress corrosion cracking studies performed for the aerospace plants are not relevant to the oil and gas plant applications of the specificity of conditions needed for stress corrosion cracking. … Continue reading Evaluation of Stress Corrosion cracking of Inconel 718 in oil and gas field

The new face of oil and gas discovery will be with deep wells, specifically in deepwater. As compared to shallow wells, deep wells normally need high performance nickel base alloys. Wells are classified as sweet or sour. Sweet wells are just mildly corrosive, whilst sour wells are extremely corrosive. Sour wells contain hydrogen sulfide, carbon … Continue reading Performance of high functional nickel based super alloys in sour oil and gas conditions

The role of stress is generally considered or the stress intensity factor in case of precracked samples as an effect with the passage of time in a given system. There is a threshold stress value below which corrosion does not occur even for long test duration. The threshold stress is not just a function of … Continue reading How stress influences Stress corrosion cracking

AISI 300 series Stainless Steel Many changes have been made with austenitic stainless steels. Stainless steel 300 series alloys with C: 0.08%, Cr: 16%, Ni: 8%, P: 0.045%, S : 0.04%, Mn: 2% and Si: 2% and with other permitted composition elements are solution heat treated and free for cold work to enhance their mechanical … Continue reading Which alloy is best to resist Sulfide stress cracking and Stress corrosion cracking?

The duplex steels offer an excellent range of corrosion resistance in the diverse media. Following is the brief explanation of their resistance in the variety of application conditions. Uniform Corrosion: Uniform corrosion is featured by even attack on the steel surface that comes in contact of the attacking media. The prevention of corrosion is assumed … Continue reading Corrosion resistance of duplex stainless steels