GB/T 23337-2009 Internal combustion engines—Intake and exhaust valves—Specification

GB/T 23337-2023 Internal combustion engines—Intake and exhaust valves—Specification

GB/T 1184-1996 Geometrical tolerancing—Geometrical tolerance for features without individual tolerance indications GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 1958-2004 Geometrical product Specifications(GPS)—Geometrical tolerance—Verification prescription GB/T 11354-2005 Determination of nitrided case depth and metallographic microstructure examination for steel and iron parts GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.2-2015 Metallic materials—Tensile testing—Part 2:Method of test at elevated temperature GB/T 228.3-2019 Metallic materials—Tensile testing—Part 3:Method of test at low temperature GB/T 228.4-2019 Metallic materials—Tensile testing—Part 4:Method of test in liquid helium GB/T 230.1-2004 Metallic Rockwell hardness test—Part1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2009 Metallic materials—Rockwell hardness test—Part 1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2018 Metallic materials—Rockwell hardness test—Part 1:Test method GB/T 1031-1995 Surface roughness parameters and their values GB/T 1031-2009 Geometrical Product Specifications (GPS)—Surface texture:Profile method—Surface roughness parameters and their values GB/T 2828.1-2003 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 2828.1-2012 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 3077-1999 Alloy structure steels GB/T 3077-2015 Alloy structure steels GB/T 4340.1-1999 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2009 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2024 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4955-1997 Metallic coatings—Measurement of coating thickness—Coulometric method by anodic dissolution GB/T 4955-2005 Metallic coatings—Measurement of coating thickness—Coulometric method by anodic dissolution GB/T 4956-2003 Non-magnetic coatings on magnetic substrates—Measurement of coating thickness-Magnetic method GB/T 6394-2002 Metal-methods for estimating the average grain size GB/T 6394-2017 Determination of estimating the average grain size of metal GB/T 6462-1986 Metallic and oxide coatings—Measurement of coating thickness—Microscopical method GB/T 6462-2005 Metallic and oxide coatings—Measurement of coating thickness—Microscopical method GB/T 9790-1988 Metallic and related coatings—Vickers and Knoop microhardness tests GB/T 9790-2021 Metallic materials—Vickers and Knoop microhardness tests of metallic and other inorganic coatings GB/T 12773-2008 Valve steel and superalloy bars for internal combustion engines GB/T 12773-2021 Valve steel and superalloy bars for internal combustion engines JB/T 3168.3-1999 The chemical composition analysis method for spray welding alloy powder JB/T 6012.2-2008 Internal Combustion Engine Intake and Exhaust Valves - Part 2: Microstructure Inspection JB/T 6012.3-2008 Internal combustion engine, intake and exhaust valves, Part 3: Magnetic particle inspection JB/T 6012.4-2008 Internal combustion engine inlet and exhaust valve, Part 4: Friction welded valves, ultrasonic testing JB/T 6012.2-2025 Internal Combustion Engine, Intake and Exhaust Valves, Part 2: Microstructure Inspection GB/T 4956-2025 Non-magnetic coatings on magnetic substrates—Measurement of coating thickness—Magnetic method GB/T 6462-2025 Metallic and oxide coatings—Measurement of coating thinckness—Microscopical method