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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

Inconel 625 is a popular nickel based superalloy for its durability, fabricability, weldability and excellent corrosion resistance. Its supreme and versatile corrosion resistance under diverse temperature and corrosive conditions is the main reason for its wide acceptance in chemical and other plant applications. Inconel alloy 625 is an austenitic solid solution strengthened NiCrMo alloy that … Continue reading How does Inconel 625 perform in diverse corrosive environments

Usually it is understood that pure metals are more resistant to environmental assisted cracking as compare to alloyed metals because pure metals have lower mechanical strength and high ductility. For instance, it is said that commercially pure nickel is not prone to stress corrosion cracking, until unless it is heavily cold processed at high temperatures … Continue reading Observation of Stress corrosion behaviour of Nickel based alloys

However it is chemically categorized as a weaker acid than hydrochloric or sulfuric acid, some materials are extremely corrosive more than even hydrofluoric acid. Use of gold and platinum are fully resistant to corrosion in aqueous solutions. The engineering materials that are significantly used in hydrofluoric acid owe their corrosion resistance to the development of … Continue reading Corrosion resistance behaviour of Nickel alloys in hydrofluoric acid

Inconel grades are high nickel alloys that are designed to resist corrosion specifically at the elevated points. They are recommended materials for use in sulfur-free media. Inconel alloys are suitable for use from cryogenic points to above 1200oF. They are widely used in the chemical units. Applications include heaters, stills, bubble towers, condensers for treatment … Continue reading How do Inconel alloys perform in varied service conditions?

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

Nickel based alloys containing chromium, molybdenum, tungsten and other elements are commonly used for equipment production in the petrochemical, chemical process and power plants due to their supreme corrosion resistance in the oxidizing and reducing conditions. The availability of sufficient chromium content enhances the development of passive barrier oxide layer of Cr2O3 on the surface … Continue reading How nickel based alloys perform against localized corrosion

Acid solutions are widely used in chemical industry to eliminate mill scales from metallic surface. The inclusion of inhibitors suitable secures the metal against an acid corrosion. Usually acid inhibitors are organic compounds comprising of nitrogen, oxygen and sulfur. These compounds are adsorbed on the metallic surface blocking the active corrosion sites. Due to toxicity … Continue reading Corrosion behaviour of nickel and its alloys in HCl and its prevention by natural rosemary oil

Nickel-Chromium-Molybdneum alloys were selected as suitable materials for nuclear waste containers as they provide outstanding resistance to localized corrosion in conditions that may occur at the permanent repository site. It was crucial to determine if prolong exposure to low temperatures would be harmful to the resistance property of Hastelloy C22 , C4 and C276 alloys … Continue reading Which alloy is the best fit for nuclear waste containers

The fracture hardness of Inconel alloy 625 in the cast and welded conditions has been evaluated as a part of complete properties of alloy for advanced steam turbine applications. The fracture properties of solution treated alloy vary because of prolong aging at 650oC, with metallurgical precipitation causing changes to critical toughness and fracture resistance profiles. … Continue reading Evaluation of Fracture toughness properties of Inconel grade 625