GB/T 14976-2025 Seamless stainless steel pipes for fluid transport
1 Scope
This document specifies the classification, code, ordering contents, manufacturing processes, technical requirements, specimens, test methods, inspection rules, packaging, marking and quality certification of seamless stainless steel pipes for fluid transport.
This document is applicable to seamless stainless steel pipes for fluid transport (hereinafter referred to as "steel pipes").
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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 223.9 Iron, steel and alloy - Determination of aluminium content - Chrome azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy The sodium thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron steel and alloy - The α-benzoinoxime gravimetric method for the determination of molybdenum content
GB/T 223.36 Methods for chemical analysis of iron, steel and alloy - The neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.37 Iron, steel and alloy - Determination of nitrogen content - Indophenol blue spectrophotometric method after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Iron, steel and alloy - Determination of silicon content - Gravimetric method
GB/T 223.63 Iron, steel and alloy - Determination of manganese content - Sodium (potassium) periodate spectrophotometric method
GB/T 223.84 Steel and iron - Determination of titanium content - Diantipyrylmethane spectrophotometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
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 232 Metallic materials - Bend test
GB/T 241 Metal materials - Tube - Hydrostatic pressure test
GB/T 242 Metal materials - Tube - Drift-expanding test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 1031 Geometrical product specifications (GPS) - Surface texture: Profile method - Surface roughness parameters and their values
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4334-2020 Corrosion of metals and alloys - Test methods for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels
GB/T 5777 Automated full peripheral ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal and/or transverse imperfections
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 7735 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 10561-2023 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 17395 Dimensions, shape, masses and tolerances of steel tubes
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)
GB/T 30062 Terminology of steel pipes and tubes
YB/T 4395 Steel - Determination of molybdenum, niobium and tungsten contents - Inductively coupled plasma atomic emission spectrometric method
YB/T 4396 Stainless steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 30062 apply.
4 Classification and code
4.1 Steel pipes shall be classified by manufacturing methods, with the codes as follows:
a) cold rolled (drawn) steel pipe, with a code of W-C;
b) hot-rolled (extruded, forged, expanded) steel pipe, with a code of W-H.
4.2 Steel pipes shall be classified according to the dimensional precision, with the codes as follows:
a) Ordinary grade, with a code of PA;
b) High grade, with a code of PC.
4.3 For the purposes of this document, the following symbols apply.
D: outside diameter (unless otherwise specified, including nominal outside diameter and/or calculated outside diameter, in mm).
Dc: calculated outside diameter (the outside diameter calculated based on the nominal inside the nominal wall thickness, in mm).
d: nominal inside diameter (in mm).
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and code
5 Ordering contents
6 Manufacturing processes
6.1 Method for smelting steel
6.2 Methods for manufacturing steel pipes
6.3 Delivery state
7 Technical requirements
7.1 Grade and chemical composition of steel
7.2 Mechanical properties
7.3 Hydraulic test
7.4 Processing properties
7.5 Intergranular corrosion test
7.6 Surface quality
7.7 Non-destructive testing
7.8 Special requirements
7.9 Dimension, shape and weight
8 Specimens
8.1 Specimen for tensile test
8.2 Specimen for impact test
8.3 Specimen for bend test
9 Test methods
10 Inspection rules
10.1 Inspection and acceptance
10.2 Batching rules
10.3 Sampling quantity
10.4 Re-inspection and judgment rules
11 Packaging, marking and quality certification
Annex A (Nominative) Additional requirements for austenitic stainless steel pipes used in low-temperature working conditions
A.1 General
A.2 Manufacturing method
A.3 Mechanical properties at room temperature
A.4 Impact test
A.5 Flattening test
A.6 Ultrasonic testing
Annex B (Nominative) Additional requirements for austenitic stainless steel pipes used for oxygen pipeline
B.1 General
B.2 Impact test
B.3 Processing properties
B.4 Surface quality
B.5 Degreasing
B.6 Ultrasonic testing
B.7 Packaging
Annex C (Nominative) Determination of grease residue on surface of steel piles
C.1 General
C.2 Gravimetric method
C.3 Grease analyzer determination method
