Oil and gas well tubing products
Shell and tube steel grades in the API 5CT standard include:
Group 1 (low and medium resistance oil casing): H40, J55, K55, N80-1, N80-Q, R95
Group 2 (yield strength, suitable for hydrogen resistant environmental oil casing resistant to sulfur or carbon dioxide corrosion): M65, L80-1, L80-9Cr, L{{4} }Cr, C90, T95, C110
Group 3 (high strength oil casing): P110 Group 4 (high strength oil casings that limit hardness fluctuations): Q125
Non-API 5CT Standard Tubes and Shells
None of the API 5CT standard pipe and casing steel grades include: 130, 140, 150, 160, 170, etc.
API SPEC 5CRA - Corrosion Resistant Alloy Seamless Steel Pipe for Casing, Tubes and Couplings This standard provides a seamless casing for corrosion resistant alloys for acid and oil wells, in high CO2 oil and gas/ H2S or H2S Performance requirements and recommendations for service in the environment. The dimensions, shape, technical requirements, experimental methods, inspection rules, packaging and storage methods of corrosion-resistant alloy seamless pipes are specified.
The purpose of the standard is to provide corrosion resistant alloy seamless pipe standards for casings and tubes that have improved corrosion resistance and are suitable for use in the oil and gas industry. It also includes requirements and recommendations for material selection and evaluation for corrosion-resistant alloys operating in oil and gas exploration and development in high CO2/H2S or H2S environments. The standard specifies the basic physical and chemical properties of corrosion-resistant alloy materials for shells and tubes, stress corrosion cracking, stress corrosion cracking and hydrogen-induced cracking in corrosive CO2/H2S media, and technical specifications for Delivery. Standard steel grades are: 65, 80, 95, 110, 125, 140.
The types of materials included in the standard are divided into 4 groups:
Group 1 ------ martensite or martensite/ferritic stainless steel;
Group 2——Ferritic-austenitic stainless steel (duplex steel or superduplex steel);
Group 3 ------ iron-based austenitic stainless steel;
Group 4 ------ nickel-based austenitic alloy.
