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N’GENIUS develops high strength austenitic stainless steels

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Meenal Datar

Membership specialist

UK-based material technology company, N’GENIUS, has developed a series of high strength austenitic stainless steels that can be used across the oil and gas sector. The N’GENIUS Series has been specifically developed to be superior to the majority of existing grades in the 300 Series.

The corrosion resistant alloy (CRA) line pipe grades are currently available for selection in the API Specification 5LC and the DNV-ST-F101 standard, plus the CRA Oil Country Tubular Goods (OCTG) in the API Specification 5CT for casing and tubing.

Dr Ces Roscoe, CEO of N’GENIUS explains: ‘The range of alloy types, variants and grades in the N’GENIUS series of high strength austenitic stainless steels have strength properties equivalent to duplex and super-duplex stainless steels, ductility and toughness levels normally associated with conventional austenitic stainless steels but with greater corrosion resistance to suit all major oil and gas projects.’

 The N’GENIUS Series provides high strength austenitic stainless steels which are corrosion resistant and able to withstand sub-zero temperatures. These characteristics will allow a range of product forms and ancillary equipment to be designed, manufactured and supplied with the objective of reducing wall thicknesses. In turn, using less material and producing lighter products. This will make products easier to handle and transport to site, leading to weight savings, an overall reduction in construction and project costs and contribute to lower carbon emissions. The corrosion resistance of the N’GENIUS will also make projects more cost-effective and environmentally sustainable.

The combination of mechanical strength and corrosion resistance properties of the N’GENIUS series will greatly affect material selection philosophy for oil and gas industry projects. At present, CRA pipeline material doesn’t suit all the requirements of design engineers, process engineers, corrosion specialists and project engineers for major CRA pipeline projects.

In terms of oil and gas production system design, the N’GENIUS series has been developed to be the total system material solution. A vast array of wrought and cast products and equipment can be manufactured and supplied in the N’GENIUS for onshore and offshore oil and gas production systems.

Subsea umbilicals, catenary risers and flowlines, manifolds, subsea bundles, well heads, fittings, flanges, compact flanges, hub connectors and engineered products such as pumps and valves are among these products and equipment. As are fabricated products such as offshore topside systems including spools, modules, static risers, process piping systems, seawater cooling systems, firewater systems, filtration systems, heat exchangers and various ancillary equipment including tanks, vessels and structures.

The benefits of the N’GENIUS series include; reaching new reserves, operating in challenging service conditions and exposure to increasingly aggressive process media puts material choice for OCTG into view. Suited for OCTG casing and tubing, the high strength of the N’GENIUS solves the issues caused by elevated temperatures, high pressures and higher mechanical loads, whilst its improved corrosion resistance provides a robust defence even in harsh process media environments containing various levels of Chlorides, CO2 , H2S and other constituents. The N’GENIUS series also ensures the resistance to hydrogen embrittlement and, in particular, stress corrosion cracking (SCC) in aggressive media environments which can often be a major obstacle for OCTG.

To assist engineers at the conceptual design stage, pre-FEED and FEED stages and detailed engineering design stages of the materials selection and specification process, material data sheets (MDS) have been formulated for a wide range of product types to establish the minimum criteria for the manufacture, inspection, testing and control in accordance with International Codes, standards and specifications for each alloy type, variant and grade in the N’GENIUS series.

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