GB/T 3091-2025 Welded steel pipes for low pressure fluid delivery
1 Scope
This standard specifies the order information, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking, storage and quality certificate of welded steel pipes for low pressure fluid delivery.
This document is applicable to longitudinal high frequency electric welded (HFW) steel pipes, longitudinal submerged-arc welded (SAWL) pipes and helical submerged-arc welded (SAWH) steel pipes as well as their galvanized steel pipes (hereinafter referred to as "steel pipes") for the delivery of low pressure fluids such as water, air, steam and gas.
2 Normative references
The following 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 aluminum content - Chrome azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
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 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
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 241 Metal materials - Tube - Hydrostatic pressure test
GB/T 244 Metallic materials - Tube - Bend test method
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 470 Zinc ingots
GB/T 700 Carbon structural steels
GB/T 709 Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2651 Destructive tests on welds in metallic materials - Transverse tensile test
GB/T 2653 Bend test methods on welded joints
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels
GB/T 3524 Hot-rolled carbon and low alloy structural steel strips
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads
GB/T 7735 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 11345 Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and assessment
GB/T 17395 Dimensions, shapes, masses and tolerances of seamless 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 40385 Non-destructive testing of steel tubes - Digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections
GB/T 42664 Non-destructive testing of steel tubes - Automated ultrasonic testing of the weld seam of welded steel tubes for the detection of longitudinal and/or transverse imperfections
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 30062 apply.
4 Order information
The contract or order for ordering steel pipes according to this document shall cover the followings:
a) reference to this document;
b) product name;
c) steel designation (including quality grade);
d) ordering quantity (total weight or total length);
e) dimension and specification (nominal outside diameter × nominal wall thickness, in mm);
f) length;
g) manufacturing method;
h) weight requirements of galvanized coating (where applicable);
i) other requirements.
5 Dimension, shape, weight and permissible deviation
5.1 Outside diameter, wall thickness and their permissible deviations
5.1.1 The steel pipes shall be delivered according to the nominal outside diameter (D) and nominal wall thickness (t). The nominal outside diameter, nominal wall thickness and their permissible deviations of steel pipes with the nominal outside diameter of not greater than
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Order information 5 Dimension, shape, weight and permissible deviation 6 Technical requirements 7 Test methods 8 Inspection rules 9 Packaging, marking, storage and quality certificate Annex A (Informative) Dimensions of steel pipes with threaded or grooved connection at ends Annex B (Normative) Weight determination of galvanized coating - Antimony chloride method Annex C (Normative) Uniformity test of galvanized coating - Impregnation method with cupric sulfate
