GB/T 14383-2021 Forged fittings, socket-welding and threaded
1 Scope
This standard specifies the varieties and codes, pressure ratings, special connection forms, nozzle dimensions, order information, shapes, dimensions and tolerances, materials, manufacture, heat treatment, inspections and tests, marking, surface protection and packaging, and product quality certificate requirements for forged fittings, both socket-welding and threaded.
This standard is applicable to socket-welding and threaded fittings forged of steel with nominal dimensions less than or equal to DN 100 and pressure ratings of (Class) 2,000, 3,000, 6,000, and 9,000 in piping systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) 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 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 228.2 Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 231 (All parts) Metallic materials - Brinell hardness test
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4334 Corrosion of metals and alloys - Test methods for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 9452 Testing method for working zone of heat treatment furnace
GB/T 10561 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 13305 Micrographic method for determining area content of the α-phases in stainless steels
GB/T 13401 Steel buttwelding pipe fittings - Technical specification
GB/T 17394 (All parts) Metallic materials - Leeb hardness test
GB/T 17897 Corrosion of metals and alloys - Corrosion test for pitting corrosion resistance of stainless steels in the ferric chloride solution
GB/T 18253-2018 Steel and steel products - Types of inspection documents
GB/T 20801.2 Pressure piping code - Industrial piping - Part 2: Materials
NB/T 47013.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47013.4 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipments - Part 5: Penetrant testing
3 Varieties and codes
See Table 1 for varieties and codes of pipe fittings.
Table 1 Varieties and codes of pipe fittings
Foreword I
1 Scope
2 Normative references
3 Varieties and codes
4 Pressure ratings
5 Special connection forms
6 Nozzle dimensions
7 Order information
8 Shapes, dimensions and tolerances
9 Materials
10 Manufacture
11 Heat treatment
12 Inspection and test
13 Marking
14 Surface protection and packaging
15 Product quality certificate
Annex A (Normative) Dimensions of steel pipes connected to pipe fittings
Annex B (Normative) Additional requirements
Annex C (Informative) Common raw materials for manufacturing pipe fittings
Annex D (Informative) Summary table of inspection and testing
Bibliography
