This standard specifies requirements of order contents, dimension, material, manufacturing , inspection, test and mark for forged fittings, socket-welding and threaded.
This standard is applicable to the forged fittings, socket-welding and threaded that made of metallic material with a nominal dimension not be larger than DN 100.
2 Normative Reference
The following normative documents contain provision which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. But the parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (All Parts) Methods for chemical analysis of iron steel and alloy
GB/T 228 Metallic materials-Tensile testing at ambient temperature (GB/T 228—2002, eqv ISO 6892:1998)
GB/T 229 Metallic materials—Charpy pendulum impact test method (GB/T 229—2007, ISO 148-1:2006, MOD)
GB/T 699 Quality carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 1220 Stainless steel bars
GB/T 1221 Heat-resistant steel bars
GB/T 2975 Steel and steel products-Location and preparation of test pieces for mechanical testing (GB/T 2975—1998, eqv ISO 377:1997)
— — Hexagon head male and female threaded Joint HHB
— — Headless male and female threaded Joint FB
A When the ends, welded with main pipe, are required to be processed into a shape with 45°oblique angle, "B" shall be added behind the code number; namely, the code number of a Half-Coupling with an oblique angle on one end is SHCB, the code number of a half threaded coupling with an oblique angle on one end is THCB.
4 Classes of Pipe Fittings
The classes of socket welding pipe fittings are divided into classes related to 3000, 6000 and 9000; the classes of threaded pipe fittings are divided into 2000, 3000and 6000; see Table 2 for the classes of pipe wall thicknesses which adapt to it.
Contents Foreword 1 Scope 2 Normative Reference 3 Sorts and Code Numbers 4 Classes of Pipe Fittings 5 Special Connection Type 6 Connecting Pipe Size 7 Order Contents 8 Shape, Size and Tolerance 9 Materials 10 Manufacturing 11 Heat Treatment 12 Inspection 13 Tests 14 Mark 15 Surface Protections and Package 16 Product Quality Certifications Annex A (Informative) Annex B (Normative) Dimension of Pipes Connecting with Pipe Fittings Annex C (Normative) Additional requirement
