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)
GB/T 3077 Alloy structure steels
GB/T 4334 (All Parts) Stainless steel-Corrosin Testing Method
GB/T 4338 Metallic materialsDTensile testing at elevated temperature (GB/T 4338—2006, ISO 783:1999, MOD)
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams (ISO 4967:1998, IDT)
GB/T 12716 Pipe threadeds with the threaded angle of 60 degrees where pressure-tight joints are made on the threadeds
GB/T 17394 Metallic materials-Leeb hardness test
GB/T 18253 Steel and steel products-Types of inspection documents (GB/T 18253—2000, eqv ISO 10474:1991)
GB/T 20066-2006 Steel and iron? Sampling and preparation of samples for the determination of chemical composition (ISO 14284:1996, IDT)
JB/T 4730.3 Nondestructive testing of pressure equipments -Part 3: Ultasonic testing
JB/T 4730.4 Nondestructive testing of pressure equipments-Part 4: Magnetic particle testing
JB/T 4730.5 Nondestructive testing of pressure equipments-Part 5: Penetrant testing
ASME B36.10M-2004 Welded and Seamless Wrought Steel Pipe
3 Sorts and Code Numbers
See Table 1 for the sorts and code numbers of pipe fittings.
Table 1 the Sorts and Code Numbers of Pipe Fittings
Connection type Sort Code number Connection type Sort Code Number
Socket Welding Socket Welding 45° Elbow S45E Threaded Threaded 45° Elbow T45E
Socket Welding 90° Elbow S90E Threaded 90° Elbow T90E
Socket Welding Tee ST Male and female threaded 90° Elbow
T90SE
Socket Welding 45° Tee S45T Threaded Tee TT
Socket Welding Cross SCR Threaded cross TCR
Coupling (concentric) SFC Full threaded coupling(concentric ) TFC
Coupling (eccentric ) SFCR Full threaded coupling (eccentric ) TFCR
Half-Coupling SHC Half threaded coupling THC
Half-Coupling (with oblique angle )a SHCB Half threaded coupling (with oblique angle)a THCB
Socket Welding Cap SC Threaded cap TC
— — Square head pipe plug SHP
— — Hexagon head pipe plug HHP
— — Round head pipe plug RHP
— — 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.
