GB/T1591-2018"HighStrengthLowAlloyStructuralSteels"isthelatestChinesenationalstandardforhigh-strengthlow-alloy(HSLA)structuralsteels.Thisstandardspecifiestheclassification,technicalrequirements,testmethods,inspectionrules,packaging,markingandqualitycertificatesforHSLAsteelsusedinstructuralapplications.KeyfeaturesofGB/T1591-2018include:1.Coverssteelgradeswithyieldstrengthsrangingfrom235MPato690MPa2.Includesrequirementsforchemicalcomposition,mechanicalpropertiesandtechnologicalperformance3.Appliestohot-rolledsteelplates,strips,sectionsandbarsforwelded,boltedandrivetedstructures4.ReplacesthepreviousGB/T1591-2008versionwithupdatedtechnicalrequirements5.AlignswithinternationalstandardswhilemaintainingChineseindustrialrequirementsThisstandardiswidelyusedinconstruction,bridges,vehicles,shipsandotherstructuralengineeringapplicationswherehighstrengthandgoodweldabilityarerequired.The2018revisionincorporatesimprovementsinsteelproductiontechnologyandbettermeetsmodernengineeringdemands.
