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GB/T 5310-2023 English PDF (GBT5310-2023)

GB/T 5310-2023 English PDF (GBT5310-2023)

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GB/T 5310-2023: Seamless steel tubes and pipes for high pressure boiler
This document stipulates the classification, code, order content, size, shape, weight, technical requirements, samples, test methods, inspection rules, packaging, marking and quality certificate of seamless steel tubes and pipes for high pressure boiler. This document applies to the manufacture of seamless steel tubes and pipes (hereinafter referred to as steel pipes) for boilers and pipelines of high pressure and above. It also applies to seamless steel tubes and pipes for other high-temperature and pressure-bearing equipment as a reference.
GB/T 5310-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 5310-2017
Seamless steel tubes and pipes for high pressure boiler
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 10
4 Classification and code ... 10
5 Order content ... 11
6 Size, shape, weight and allowable deviation... 11
7 Technical requirements ... 16
8 Test sample ... 37
9 Test methods ... 38
10 Inspection rules ... 39
11 Packaging, marking and quality certificate ... 40
Appendix A (Informative) Optional special requirements for ordering ... 41 Appendix B (Informative) Comparison of designations in relevant domestic and foreign standards ... 42
Appendix C (Informative) High temperature specified plastic elongation strength of steel pipes ... 43
Appendix D (Informative) Recommended data for 100 000 h lasting strength of steel pipes ... 44
Bibliography ... 47
Seamless steel tubes and pipes for high pressure boiler
1 Scope
This document stipulates the classification, code, order content, size, shape, weight, technical requirements, samples, test methods, inspection rules, packaging, marking and quality certificate of seamless steel tubes and pipes for high pressure boiler. This document applies to the manufacture of seamless steel tubes and pipes (hereinafter referred to as steel pipes) for boilers and pipelines of high pressure and above. It also applies to seamless steel tubes and pipes for other high-temperature and pressure- bearing equipment as a reference.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 222, Permissible tolerances for chemical composition of steel products GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
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- benzoyl-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.18, Methods for chemical analysis of iron steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of cupper content GB/T 32548, Steel and iron - Determination of tin, antimony, cerium, lead and bismuth - Inductively coupled plasma mass spectrometric method
NB/T 47013.5, Nondestructive testing of pressure equipment - Part 5: Penetrant testing
YB/T 4149, Continuously cast round billet for seamless steel tube rolling 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
YB/T 5137, Hot rolled and wrought round blank for high-pressure seamless steel tube
3 Terms and definitions
Terms and definitions determined by GB/T 30062 are applicable to this document. 4 Classification and code
4.1 The seamless steel tubes and pipes in this document are divided into two categories according to the product manufacturing method. The categories and codes are as follows:
a) Hot-rolled (extruded, expanded) steel tubes and pipes, code-named W-H; b) Cold-drawn (rolled) steel tubes and pipes, code-named W-C.
4.2 For the purposes of this document, the following symbols apply.
D outside diameter (if not specified, including nominal outside diameter and/or calculated outside diameter, in millimeters)
Dc calculated outside diameter (the outside diameter value calculated based on the sum of the nominal inside diameter and the nominal wall thickness, in millimeters)
d nominal inside diameter
S wall thickness (if not specified, including nominal wall thickness and/or average wall thickness, in millimeters)
Sc average wall thickness (average of the maximum and minimum wall thickness calculated based on the minimum wall thickness and its allowable deviation, in millimeters)
Smin minimum wall thickness
5 Order content
5.1 The contract for ordering steel tubes and pipes according to this document includes the following contents:
a) product name;
b) number of this document;
c) steel designation or unified digital code;
d) ordering quantity (total weight or total length);
e) dimensions.
5.2 The supplier and the buyer can negotiate to determine the optional special requirements listed in Appendix A, and indicate them in the contract for ordering steel pipes according to this document.
6 Size, shape, weight and allowable deviation
6.1 Outside diameter and wall thickness
6.1.1 Unless otherwise specified in the contract, steel tubes and pipes shall be delivered according to the nominal outside diameter and the nominal wall thickness. According to the requirements of the buyer and through negotiation between the supplier and the buyer, steel tubes and pipes can be delivered according to the nominal outside diameter and minimum wall thickness, nominal inside diameter and nominal wall thickness, or other size specifications.
6.1.2 The nominal outside diameter and wall thickness of steel tubes and pipes shall comply with the provisions of GB/T 17395. As required by the buyer, and negotiated between the supplier and the buyer, steel tubes and pipes with dimensions other than those specified in GB/T 17395 can be supplied. When steels tubes and pipes are delivered according to the nominal inside diameter and nominal wall thickness, the size specifications shall be determined by negotiation between the supplier and the buyer. 6.1.3 When steel tubes and pipes are delivered according to the nominal outside diameter and nominal wall thickness, the allowable deviations of the nominal outside diameter and nominal wall thickness shall comply with the provisions of Table 1. 6.2.2 Specific length and multiple length
6.2.2.1 As required by the buyer, after it is negotiated between the supplier and the buyer, and indicated in the contract, steel tubes can be delivered according to the specific length or the multiple length.
6.2.2.2 The allowable deviation of the specific length of steel tubes and pipes shall comply with the following provisions:
a) When D≤325 mm, +15 0 mm;
b) When D >325 mm, +30 0 mm.
6.2.2.3 An allowance shall be left for each cutting of multiple length in accordance with the following provisions:
a) When D ≤ 159 mm, the cutting allowance is 5 mm ~ 10 mm;
b) When D >159 mm, the cutting allowance is 10 mm ~ 15 mm.
6.3 Curvature
6.3.1 The curvature per meter of steel tubes and pipes shall comply with the following regulations:
a) When S≤15 mm, not greater than 1.5 mm/m;
b) When 15 mm < S ≤ 30 mm, not greater than 2.0 mm/m;
c) When S >30 mm, not greater than 3.0 mm/m.
6.3.2 For steel tubes and pipes with D ≥127 mm, the curvature in total length shall not be greater than 0.10% of the length of the steel pipe.
6.3.3 According to the requirements of the buyer, if it is negotiated between the buyer and the supplier AND indicated in the contract, other provisions may be imposed for the curvature per meter and the curvature in total length of the steel pipe. 6.4 Out-of-roundness and unevenness in wall thickness
As required by the buyer, after it is negotiated between the supplier and the buyer AND indicated in the contract, the out-of-roundness and wall unevenness of steel tubes and pipes shall not exceed 80% of the outside diameter (inside diameter) and wall thickness tolerance, respectively.
6.5 End shape
The end faces of the steel tube shall be perpendicular to the axis of the steel tube; the burrs of the cut shall be removed.
b) For hot-rolled (extruded, expanded) steel tubes and pipes with a wall thickness not greater than 12 mm, the outer surface shall not be greater than 0.4 mm; the inner surface shall not be greater than 0.3 mm; the sum of the two shall not be greater than 0.6 mm. There are no requirements for hot-rolled (extruded, expanded) steel pipes with a wall thickness greater than 12mm.
7.12 Surface quality
7.12.1 There shall be no cracks, folds, scars, rolling wrinkles or abscission layers on the inner and outer surfaces of steel tubes and pipes. These defects shall be completely removed. The removal depth of defects shall not exceed 10% of the wall thickness; the actual wall thickness at the defect removal shall not be less than the minimum allowable wall thickness.
7.12.2 The allowable depth of straight tracks on the inner and outer surfaces of steel tubes and pipes (including scratches by non-sharp mandrels) shall comply with the following regulations.
a) Cold drawn (rolled) steel tubes and pipes: not greater than 4% of the wall thickness, 0.2 mm as the maximum;
b) Hot rolled (extruded, expanded) steel tubes and pipes: not greater than 5% of the wall thickness, 0.4 mm as the maximum.
7.12.3 After negotiation between the supplier and the buyer, and noted in the contract, straight track depth requirements other than those in 7.12.2 may be specified. 7.12.4 Other local imperfections that do not exceed the allowable lower deviation of wall thickness are allowed to exist.
7.12.5 The oxide scale on the inner and outer surfaces of steel tubes and pipes shall be removed, but a thin oxide layer that does not hinder inspection is allowed to exist. The inner and outer surfaces of 08Cr9W3Co3VNbCuBN steel tubes and pipes with an outside diameter greater than 300 mm shall be ground or machined as a whole before delivery.
7.12.6 For steel tubes and pipes with an outside diameter of not less than 219 mm and a wall thickness of not less than 25 mm, the manufacturer shall choose to use liquid penetrant testing or magnetic particle testing to repair surface defects or when there are questions about the surface quality. Liquid penetrant testing or magnetic particle testing shall comply with the following regulations.
a) Liquid penetrant testing shall comply with the regulations of NB/T 47013.5. Any defect displayed as follows shall be marked with their location and removed according to the provisions of 7.12.1:
-- Displayed as linear defect;
-- Displayed as nonlinear defect with size exceeding 3 mm;
-- 3 or more defects displayed in a row with edge spacing less than 3 mm; -- On a rectangular area of 100 cm2, a total of 5 or more dense defect are displayed, the long side of the rectangle is not larger than 20 cm, and they are taken from the most unfavorable part for assessment of the defects displayed.
b) Magnetic particle testing shall comply with the regulations of GB/T 15822. Defects displayed by magnetic particle testing shall be identified and removed in accordance with 7.12.1. Magnetic particle testing is carried out by the manufacturer at the option of partial testing of the defective grinding area or full-length testing. The standard test pieces for partial testing or full-length testing shall meet the following requirements:
-- A-30/100 is used for partial testing of surface defects in the grinding area (relative groove depth is ଷ଴ଵ଴଴ ± 8 μm);
-- A-60/100 is used for full-length testing (relative groove depth is ଺଴ଵ଴଴ ± 8 μm) 7.13 Non-destructive testing
7.13.1 For steel tubes and pipes whose wall thickness to outside diameter ratio is not greater than 0.2, ultrasonic testing shall be carried on a full-length basis one by one in accordance with the provisions of GB/T 5777-2019, and the acceptance level shall be U2.
7.13.2 For steel tubes and pipes whose wall thickness to outside diameter ratio is greater than 0.2 and less than 0.3, steel tubes and pipes shall be ultrasonic tested on a full-length basis one by one in accordance with the provisions of GB/T 31925-2015, and the acceptance level shall be U2.
7.13.3 For steel tubes and pipes whose wall thickness to outside diameter ratio is not less than 0.3, unless otherwise specified in the contract, steel tubes and pipes shall be ultrasonic tested on a full-length basis one by one according to the provisions of A.3 in Appendix A of GB/T 5777-2019, and the acceptance level shall be U2.
7.13.4 When steel tubes and pipes are delivered according to the minimum wall thickness, the groove depth of the comparison sample pipe is calculated based on the average wall thickness.
7.13.5 According to the requirements of the buyer, other non-destructive testing can be added after negotiation between the supplier and the buyer and specified in the contract. 8 Test sample
8.1 Tensile test sample
8.1.1 For steel tubes and pipes with D < 219 mm, the tensile test shall be conducted along the longitudinal direction of the steel pipe.
8.1.2 For steel tubes and pipes with D ≥ 219 mm, when the size of the steel pipe allows, a circular cross-section sample with a diameter of 10 mm shall be taken transversely along the steel pipe for the tensile test; when the size of the steel pipe is not sufficient to intercept a 10 mm sample, use the larger possible transverse circular cross-section sample with a diameter of 8 mm or 5 mm; when the size of the steel pipe is not sufficient to cut a 5 mm circular cross-section sample, samples shall be taken along the longitudinal direction of the steel pipe for the tensile test. Transverse circular cross- section test pieces shall be taken from un-flattened samples.
8.2 Impact test sample
For the impact test, priority shall be given to intercepting the sample along the transverse direction of the steel pipe. When the transverse sample cannot be intercepted, the sample shall be intercepted along the longitudinal direction of the steel pipe. Regardless of whether it is cut transversely or longitudinally along the steel pipe, the impact test sample shall be a standard size sample with a thickness of 7.5 mm or a thickness of 5 mm, whichever is possibly larger.
8.3 Bending test sample
8.3.1 Sample preparation
The sample for the bending test shall be taken transversely along one end of the steel pipe, and the preparation of the sample shall comply with the provisions of GB/T 232. When the sample is taken, the forward bending sample shall be as close as possible to the outer surface, and the reverse bending sample shall be as close as possible to the inner surface. There shall be no obvious scars and other defects on the surface of the sample under bending and tension deformation.
8.3.2 Sample size
The cross-sectional size of the sample after processing is 12.5 mm × 12.5 mm or 25 mm × 12.5 mm (width × thickness); the four corners on the cross section shall be processed into rounded corners, and the radius of the rounded corners shall not be greater than 1.6 mm; the length of the sample shall not be greater than 150 mm.
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