GB/T 31439.1-2025 Corrugated sheet steel beams for road guardrail—Part 1:W-beam guardrail

GB/T 31439.2-2025 Corrugated sheet steel beams for road guardrail—Part 2:Thrie-beam guardrail

GB/T 31439.1-2015 Corrugated sheet steel beams for road guardrail—Part 1:W-beam guardrail

GB/T 90.2-2002 Fasteners—Marking and packaging GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels GB/T 700-2006 Carbon structural steels GB/T 1231-1991 Specifications of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures GB/T 1231-2006 Specifications of high strength bolts with large hexagon head,large hexagon nuts,plain washers for steel structures GB/T 1231-2024 High strength bolts with large hexagon head assemblies for steel structures GB/T 3077-1999 Alloy structure steels GB/T 3077-2015 Alloy structure steels GB/T 3103.1-2002 Tolerances for fasteners—Bolts, screws, studs and nuts GB/T 3103.3-2020 Tolerances for fasteners—Plain washers GB/T 4336-2002 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-Alloy steel(routine method) GB/T 4336-2016 Carbon and low-alloy steel—Determination of multi-element contents—Spark discharge atomic emission spectrometric method (routine method) GB/T 6725-2002 Cold formed steel sections GB/T 6725-2008 Cold forming steel sections GB/T 6725-2017 General requirements of cold forming steel sections GB/T 10111-1988 Methods for random sampling by utilizing dices of random number GB/T 10111-2008 Generation of random numbers and procedures applied to sampling inspection for product quality GB/T 16825.1-2002 Verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Verification and calibration of the force-measuring system GB/T 16825.1-2008 Verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Verification and calibration of the force-measuring system GB/T 16825.1-2022 Metallic materials—Calibration and verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Calibration and verification of the force-measuring system GB/T 18226-2000 Specification for steel components anticorrosion of highway traffic engineering appurtenances GB/T 18226-2015 Specification for steel component anticorrosion of highway engineering GB/T 18226-2025 Specification for steel component anticorrosion of highway traffic engineering