GB/T 13793-2026 Welded carbon and low alloy steel tubes for structural purpose
1 Scope
This document specifies the classification, codes, ordering information, manufacturing process, technical requirements, test methods, inspection rules, marking, packaging and quality certificates for welded carbon and low alloy steel tubes for structural purpose.
This document applies to HFW steel tubes, SAWL steel tubes and SAWH steel tubes (hereinafter referred to as "steel tubes") for structural applications in construction, machinery, vehicles and other fields.
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 Steels and alloys - Permissible deviations of product analyzed chemical composition
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom azurol S photometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.12 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 223.30 Methods for chemical analysis of iron, steel and alloy - The arsenazo III spectrophotometric method for the determination of zirconium content after separation by p-bromomandelic acid
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 - Flame atomic absorption spectrometric method for the determination of copper content
GB/T 223.59 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
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 223.78 Methods for chemical analysis of iron, steel and alloy-Curcumin spectrophotometric method for the determination of boron content
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 242 Metal materials - Tube - Drift-expending test
GB/T 244 Metallic materials - Tube - Bend test method
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2650 Destructive tests on welds in metallic materials - Impact tests
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 4171 Atmospheric corrosion resisting structural steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 7735 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 11253 Cold-rolled sheet and strip of carbon structural steels
GB/T 13237 Cold rolled quality carbon structural steel sheets and strips
GB/T 17395 Dimensions, shapes, masses and tolerances of steel tubes
GB/T 18593 Anti-corrosive painting of fusion bonded epoxy coating powders
GB/T 19879 Steel Plate for building structure
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 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
GB/T 30062 Terminology of steel pipes and tubes
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 weldseam 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 given in GB/T 30062 apply.
4 Classification and codes
4.1 The classification and codes of steel tubes based on the accuracy grade of the outer diameter are as follows:
a) Ordinary level: PD.A;
b) Relatively high level: PD.B;
c) High level: PD.C.
4.2 The classification and codes of steel tubes based on the accuracy grade of the wall thickness are as follows:
a) Ordinary level: Pt.A;
b) Relatively high level: Pt.B;
c) High level: Pt.C.
4.3 The classification and codes of steel tubes based on the accuracy grade of the curvature are as follows:
a) Ordinary level: PF.A;
b) Relatively high level: PF.B;
c) High level: PF.C.
4.4 The classification and codes of steel tubes based on the accuracy grade of the curvature over the total length are as follows:
a) Ordinary level: PF.A;
b) Relatively high level: PF.B;
c) High level: PF.C.
5 Ordering information
5.1 General requirements
The contract or order for ordering steel tubes in accordance with this document shall include the following contents:
a) Number of this document;
b) Product name;
c) Steel designation (including quality grade, if applicable);
d) Ordering quantity (total weight or total length);
e) Manufacturing method;
f) Dimensions and specifications (nominal outside diameter × nominal wall thickness, in millimetres);
g) Length;
h) Intended use (for steel tubes used for belt conveyor idlers, it shall be indicated; for others, it need not be indicated).
5.2 Special requirements
Upon agreement between the supplier and the purchaser and specified in the contract, the purchaser may select the following requirements:
a) Heat treatment of steel tubes;
b) Accuracy of dimensions and shape;
c) Impact test;
d) Condition of tube ends;
e) Weight of galvanized coating;
f) Coating thickness;
g) Other requirements.
6 Manufacturing processes
6.1 Manufacturing methods
6.1.1 The steel strips or steel plates used for manufacturing the steel tubes shall comply with GB/T 3274, GB/T 3524, GB/T 4171, GB/T 11253, GB/T 13237 or GB/T 19879.
6.1.2 Steel tubes shall be manufactured by HFW, SAWL or SAWH.
6.2 As-delivered state
6.2.1 The steel tubes shall be delivered in as-welded condition.
6.2.2 Upon the purchaser's request and subject to negotiation between the supplier and the purchaser and specified in the contract, steel tubes may be delivered in the condition of overall heat treatment or weld heat treatment.
6.2.3 Upon the purchaser's request and subject to negotiation between the supplier and the purchaser and specified in the contract, steel tubes may be delivered in the galvanized or coated condition.
7 Technical requirements
7.1 Designation and chemical composition of steel
7.1.1 The designation and chemical composition (melting analysis) of steel shall comply with the provisions of the designations and their corresponding standards given in Table 1. Upon the purchaser's request and subject to negotiation between the supplier and the purchaser, steel tubes of other designations may be supplied.
Contents
Foreword Ⅲ
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and codes
5 Ordering information
6 Manufacturing processes
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking, storage and quality certificate
Annex A (Normative) Uniformity test of galvanized coating - Impregnation method with cupric sulfate
Annex B (Normative) Determination of unit weight of galvanized coating - Antimony trichloride method
Annex C (Normative) Adhesion test of galvanized coating - Hammer test method
GB/T 13793-2026 Welded carbon and low alloy steel tubes for structural purpose
1 Scope
This document specifies the classification, codes, ordering information, manufacturing process, technical requirements, test methods, inspection rules, marking, packaging and quality certificates for welded carbon and low alloy steel tubes for structural purpose.
This document applies to HFW steel tubes, SAWL steel tubes and SAWH steel tubes (hereinafter referred to as "steel tubes") for structural applications in construction, machinery, vehicles and other fields.
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 Steels and alloys - Permissible deviations of product analyzed chemical composition
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom azurol S photometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.12 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 223.30 Methods for chemical analysis of iron, steel and alloy - The arsenazo III spectrophotometric method for the determination of zirconium content after separation by p-bromomandelic acid
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 - Flame atomic absorption spectrometric method for the determination of copper content
GB/T 223.59 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
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 223.78 Methods for chemical analysis of iron, steel and alloy-Curcumin spectrophotometric method for the determination of boron content
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 242 Metal materials - Tube - Drift-expending test
GB/T 244 Metallic materials - Tube - Bend test method
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2650 Destructive tests on welds in metallic materials - Impact tests
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 4171 Atmospheric corrosion resisting structural steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 7735 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 11253 Cold-rolled sheet and strip of carbon structural steels
GB/T 13237 Cold rolled quality carbon structural steel sheets and strips
GB/T 17395 Dimensions, shapes, masses and tolerances of steel tubes
GB/T 18593 Anti-corrosive painting of fusion bonded epoxy coating powders
GB/T 19879 Steel Plate for building structure
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 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
GB/T 30062 Terminology of steel pipes and tubes
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 weldseam 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 given in GB/T 30062 apply.
4 Classification and codes
4.1 The classification and codes of steel tubes based on the accuracy grade of the outer diameter are as follows:
a) Ordinary level: PD.A;
b) Relatively high level: PD.B;
c) High level: PD.C.
4.2 The classification and codes of steel tubes based on the accuracy grade of the wall thickness are as follows:
a) Ordinary level: Pt.A;
b) Relatively high level: Pt.B;
c) High level: Pt.C.
4.3 The classification and codes of steel tubes based on the accuracy grade of the curvature are as follows:
a) Ordinary level: PF.A;
b) Relatively high level: PF.B;
c) High level: PF.C.
4.4 The classification and codes of steel tubes based on the accuracy grade of the curvature over the total length are as follows:
a) Ordinary level: PF.A;
b) Relatively high level: PF.B;
c) High level: PF.C.
5 Ordering information
5.1 General requirements
The contract or order for ordering steel tubes in accordance with this document shall include the following contents:
a) Number of this document;
b) Product name;
c) Steel designation (including quality grade, if applicable);
d) Ordering quantity (total weight or total length);
e) Manufacturing method;
f) Dimensions and specifications (nominal outside diameter × nominal wall thickness, in millimetres);
g) Length;
h) Intended use (for steel tubes used for belt conveyor idlers, it shall be indicated; for others, it need not be indicated).
5.2 Special requirements
Upon agreement between the supplier and the purchaser and specified in the contract, the purchaser may select the following requirements:
a) Heat treatment of steel tubes;
b) Accuracy of dimensions and shape;
c) Impact test;
d) Condition of tube ends;
e) Weight of galvanized coating;
f) Coating thickness;
g) Other requirements.
6 Manufacturing processes
6.1 Manufacturing methods
6.1.1 The steel strips or steel plates used for manufacturing the steel tubes shall comply with GB/T 3274, GB/T 3524, GB/T 4171, GB/T 11253, GB/T 13237 or GB/T 19879.
6.1.2 Steel tubes shall be manufactured by HFW, SAWL or SAWH.
6.2 As-delivered state
6.2.1 The steel tubes shall be delivered in as-welded condition.
6.2.2 Upon the purchaser's request and subject to negotiation between the supplier and the purchaser and specified in the contract, steel tubes may be delivered in the condition of overall heat treatment or weld heat treatment.
6.2.3 Upon the purchaser's request and subject to negotiation between the supplier and the purchaser and specified in the contract, steel tubes may be delivered in the galvanized or coated condition.
7 Technical requirements
7.1 Designation and chemical composition of steel
7.1.1 The designation and chemical composition (melting analysis) of steel shall comply with the provisions of the designations and their corresponding standards given in Table 1. Upon the purchaser's request and subject to negotiation between the supplier and the purchaser, steel tubes of other designations may be supplied.
Contents of GB/T 13793-2026
Contents
Foreword Ⅲ
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and codes
5 Ordering information
6 Manufacturing processes
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking, storage and quality certificate
Annex A (Normative) Uniformity test of galvanized coating - Impregnation method with cupric sulfate
Annex B (Normative) Determination of unit weight of galvanized coating - Antimony trichloride method
Annex C (Normative) Adhesion test of galvanized coating - Hammer test method
