GB/T 5310-2023 English PDF (GB/T5310-2023)

GB/T 5310-2023: Seamless steel tubes and pipes for high pressure boiler
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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 ...