GB/T 13793-2016 PDF English
US$125.00 · In stock · Download in 9 secondsGB/T 13793-2016: Steel pipes with a longitudinal electric (resistance) weld Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 13793: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13793-2016 | English | 125 |
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Steel pipes with a longitudinal electric (resistance) weld
| Valid |
| GB/T 13793-2008 | English | 85 |
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Steel pipes with a longitudinal electric (resistance) weld
| Obsolete |
| GB/T 13793-1992 | English | 519 |
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4 days
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Longitudinal electric resistance welded steel tubes
| Obsolete |
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GB/T 13793-2016: Steel pipes with a longitudinal electric (resistance) weld---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT13793-2016
GB
NATIONAL STANDARD
ICS 77.140.75
H 48
Replacing GB/T 13793-2008
Steel pipes with a longitudinal
electric (resistance) weld
Issued on. AUGUST 29, 2016
Implemented on. JULY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classification and code... 9
4 Order content... 9
5 Size, shape, weight and allowable deviation... 10
6 Technical requirements... 15
7 Test methods... 21
8 Inspection rules... 23
9 Marking, packaging and quality certificates... 24
APPENDIX A (Normative) Uniformity test for galvanized layer - Copper sulfate
impregnation method... 25
APPENDIX B (Normative) Unit weight measurement of galvanized layer -
Antimony chloride method... 27
1 Scope
This standard specifies the classification and code, ordering content, size,
shape, weight and allowable deviations, technical requirements, test methods,
inspection rules, marking, packaging and quality certificates of the steel pipes
with a longitudinal electric (resistance) weld.
This standard applies to the steel pipes with a longitudinal electric (resistance)
weld which is used for machinery, construction and other structural purposes,
AND for which the outer diameter is not greater than 711 mm; it is also
applicable to the welded steel pipes for general fluid delivery services.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the
determination of phosphorus content
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-
Benzoy-N-Pheylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The
chromotropic acid photometric method for the determination of titanium
content
3 Classification and code
3.1 The steel pipe is, based on the outer diameter accuracy level, divided into.
3.2 The steel pipe is, based on the wall thickness accuracy level, divided into.
3.3 The steel pipe is, based on the bending degree level, divided into.
4 Order content
4.1 General requirements
The contract or order for the steel pipe ordering in accordance with this
standard shall at least contain the following.
4.2 Special requirements
If agreed by the supplier and the buyer AND indicated in the contract, the buyer
may select the following requirements.
5 Size, shape, weight and allowable deviation
5.1 Outer diameter and wall thickness
5.1.1 The nominal outer diameter (D) and nominal wall thickness (t) of steel
pipes shall comply with the provisions of GB/T 21835.As required by the buyer
AND through negotiation between the supplier and the buyer, it may supply the
steel pipes of other sizes than those specified in GB/T 21835.
5.1.2 The allowable deviation of outer diameter and wall thickness of steel pipe
shall comply with the requirements of Table 1 and Table 2, respectively. When
the contract does not indicate the allowable deviation level of steel pipe size,
the allowable deviation of the outer diameter and wall thickness of the steel pipe
used for belt conveyor shall be supplied at high accuracy, AND the allowable
deviation of the outer diameter and wall thickness of other steel pipes shall be
supplied at general accuracy.
5.2 Length
5.2.1 Normal length
The general length of the steel pipe shall comply with the following provisions.
5.2.2 Length of sizing and length of double sizing
As required by the buyer, through negotiation between the supplier and the
buyer, AND indicated in the contract, it may supply the steel pipes based on the
length of sizing or the length of double sizing. The total length of the sizing and
double sizing shall be within the range of the general length. Each length of
sizing shall be reserved with an incision margin of 5 mm ~ 10 mm. The allowable
deviation of the length of sizing and the length of double sizing shall comply
with the following requirements.
5.4 Out-of-roundness
The out-of-roundness of the steel pipe (the difference between the maximum
outer diameter and the minimum outer diameter of the same cross-section)
shall comply with the following requirements.
5.5 End faces of steel pipes
5.6 Weld height of steel pipe
Pipe end
5.6.1 The weld burrs outside the steel pipe shall be cleared and flattened.
5.6.2 The steel pipes for the belt conveyer idler shall be supplied after removing
the inner burrs. As required by the buyer, other steel pipes of more than 25 mm
outer diameter can be supplied after removing the inner burrs.
5.6.3 When the steel pipes are supplied after removing the inner burrs, the inner
weld burr height shall comply with the provisions of Table 4, AND after the burr
is removed, the remaining wall thickness of the steel pipe shall be not less than
the allowable minimum value of the wall thickness. If the steel pipe accuracy
level does not specified in the contract, it shall follow the general accuracy. As
required by the buyer, through negotiation between the supplier and the buyer,
AND indicated in the contract, it may supply the steel pipe of other inner burr
height than those specified in Table 4.
6 Technical requirements
6.1 Steel designation and chemical composition
6.1.1 The designation and chemical composition of the steel (melting analysis)
shall be respectively in accordance with the requirements of 08, 10, 15, and 20
of GB/T 699-2015, OR the provisions of Q195, Q215A, Q215B, Q235A, Q235B,
Q235C, Q275A, Q275B, Q275C in GB/T 700-2006, OR the provisions of
6.1.2 The chemical composition of the steel pipe shall be accepted based on
the melting composition. When the buyer requires finished product analysis, it
shall make indication in the contract; AND the allowable deviation of the
chemical composition of the finished product shall comply with the provisions
of GB/T 222.
6.2 Manufacturing methods
Steel pipe shall be manufactured using hot-rolled steel strip or cold-rolled steel
strip through high-frequency resistance welding method. When the buyer
specifies the raw material of a certain rolling status, it shall be indicated in the
contract.
6.3 Supply status
The steel pipe shall be supplied in welded status or heat treatment status.
As required by the buyer, through negotiation between the supplier and the
buyer, AND indicated in the contract, the steel pipe can be supplied at the
overhaul heat treatment status or weld heat treatment status.
6.4 Mechanical properties
6.4.1 Base metal tensile test
6.4.2 Weld transverse tensile test
As for the steel pipe of outer diameter not less than 219 mm, it shall be
subjected to transverse tensile test of welds. The weld transverse tensile test
only determines the tensile strength, which shall comply with the provisions of
6.4.3 Impact test
As required by the buyer, through negotiation between the supplier and the
buyer, AND indicated in the contract, the steel pipes of quality level B, C and D
can be subjected to impact test. AND the impact energy absorption of the pipe,
weld, and heat affected zone shall be determined by the supplier and the buyer
through negotiation.
6.5 Process performance
6.5.1 Flattening test
6.8 Surface quality
6.8.1 The inner and outer surface of the steel pipe shall not be allowed to have
cracks, scarring, folding, delamination, lap welding and over-burning defects.
BUT it is allowed for the scratches, weld dislocations, burns, scales, and outer
burrs removal marks which do not more than the wall thickness negative
deviation.
6.9 Galvanizing
6.9.1 As required by the buyer, through negotiation between the supplier and
the buyer, AND indicated in the contract, the steel pipe shall be galvanized
externally through hot dip galvanizing method before being supplied.
6.9.2 The inner and outer surfaces of the galvanized steel pipe shall have a
complete galvanized coating, AND be free from un-galvanized black spots or
bubbles. BUT it is allowed for rough surface and zinc nodules locally.
6.9.3 The galvanized steel pipe shall be subjected to galvanized layer uniformity
test. The sample shall, after being continuously immersed in copper sulphate
solution for 5 times, not turn red (copper-plated color).
7 Test methods
7.1 The sampling for chemical composition analysis of steel pipes shall be in
accordance with the provisions of GB/T 20066.The spectral analysis method
of chemical composition shall be in accordance with the provisions of GB/T
4336 or GB/T 20125.
7.2 The steel pipe size and shape shall be measured by the gauge complying
with the accuracy requirements. The outer diameter of the steel pipe shall be
measured at least 50 mm from the pipe end. As for the steel pipe of general
accuracy, it shall be subjected to one size and shape measurement during each
work shift every 4 hours, AND whenever any size of the steel pipe changes, it
shall conduct measurement.
7.3 The inner and outer surfaces of steel pipes shall be inspected visually under
sufficient lighting conditions.
7.4 The sampling quantity, sampling method and test method of other
inspection items of steel pipe shall comply with the provisions of Table 8.
Table 8 Sampling quantity, sampling method and test method for other
inspection items of steel pipes
8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of the steel pipe shall be conducted by the
quality and technical supervision department of the supplier.
8.2 Batching rules
Steel pipe shall be inspected and accepted in batches. Each batch of steel pipe
shall be composed of steel pipes of the same heat, same designation, same
specification, same accuracy level, same welding procedure, same supply
status, same heat treatment system (if applicable), and same galvanized layer
weight level (if applicable). The quantity of each batch of steel pipes shall not
exceed the provisions below.
8.3 Number of samples
The number of steel pipe samples to be inspected shall be in accordance with Table 8.
8.4 Re-inspection and judgement rules
The re-inspection and judgment rules of steel pipes shall comply with the
provisions of GB/T 2102.
9 Marking, packaging and quality certificates
9.1 Marking
The marking of the steel pipe shall include at least the following. manufacturer
name or trademark, product standard number, steel designation, product
specification, classification and code, and traceable identification number.
The remaining requirements of the marking shall comply with the provisions of GB/T 2102.
9.2 Steel pipe packaging and quality certificate
The packaging and quality certificate of the steel pipe shall comply with the
provisions of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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