GB/T 37602-2019 Ship and offshore engineering steel for low temperature service

GB/T 6803-1986 Standard method for conducting drop-weight test to determine nilductility transition temperature of ferritic steels GB/T 6803-2008 Test method for drop-weight test to determine nil-ductility transition temperature of ferritic steels GB/T 6803-2023 Test method for drop-weight test to determine nil-ductility transition temperature of ferritic steels GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 17505-1998 Steel and steel products General technical delivery requirements GB/T 17505-2016 Steel and steel products—General technical delivery requirements GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition GB/T 20123-2006 Steel and iron—Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20124-2006 Steel and iron—Determination of nitrogen content—Thermal conductimetric method after fusion in a current of inert gas (Routine method) GB/T 20125-2006 Low-alloy steel—Determination of multi-element contents—Inductively coupled plasma atomic emission spectrometric method GB/T 21143-2007 Metallic materials—Unified method of test for determination of quasistatic fracture toughness GB/T 21143-2014 Metallic materials—Unified method of test for determination of quasistatic fracture toughness GB/T 21143-2025 Metallic materials—Unified method of test for determination of quasistatic fracture toughness NB/T 47013.3-2023 Non-destructive testing of pressure equipment - Part 3: Ultrasonic testing NB/T 47013.3-2015 Non-destructive testing of pressure equipment - Part 3: Ultrasonic testing