GB/T 13295-2008 Ductile iron pipes,fittings and accessories for water or gas applications

GB/T 13295-2003 Ductile iron pipes,fittings and accessories for water or gas applications

GB/T 13295-2013 Ductile iron pipes,fittings and accessories for water or gas applications

ISO 4179 ISO 8179-1 ISO 8179-2 ISO 8180 GB/T 90.1-2002 Fasteners—Acceptance inspection GB/T 90.1-2023 Fasteners—Acceptance inspection GB/T 90.2-2002 Fasteners—Marking and packaging GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances 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 231.1-2002 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 231.1-2009 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 231.1-2018 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 3672.1-2002 Rubber—Tolerances of products—Part 1:Dimensional tolerances GB/T 5721-1993 General rules of identification, packaging, transportation and storage for rubber sealing products GB/T 6414-1999 Castings—System of dimensional tolerances and machining allowances GB/T 6414-2017 Castings—Dimensional tolerances and geometrical tolerances and machining allowances GB/T 6483-1986 Soft mechanical joint grey cast iron pipe GB/T 6483-2008 Soft mechanical joint grey cast iron pipe 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 17219-1998 Standard for safety evaluation of equipment and protective materials in drinking water system GB/T 17459-1998 Ductile iron pipes—Bitumen coating GB/T 17671-1999 Method of testing cements—Determination of strength GB/T 17671-2021 Test method of cement mortar strength(ISO method) GB/T 3672.1-2025 Tolerances for rubber products—Part 1:Dimensional tolerances GB/T 17219-2025 Hygienic safety evaluation of distribution equipment,protective materials and treatment materials in drinking water system

ISO 2531:1998