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GB/T 2102-2022: Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2102-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 2102-2006
Acceptance, packaging, marking and quality certification
for steel tubular products
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Acceptance rules ... 7
5 Packaging ... 8
6 Marks ... 14
7 Quality certificate ... 15
Bibliography ... 17
Acceptance, packaging, marking and quality certification
for steel tubular products
1 Scope
This document specifies the acceptance rules for steel tubular products as well as the
technical requirements for packaging, marking and quality certificates.
This document applies to acceptance rules for steel tubular products and general
requirements for packaging, marking and quality certificates. When there are special
provisions in product standards, follow the provisions of product standards.
2 Normative references
The following referenced documents are indispensable for the application 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 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 17505, Steel and steel products - General technical delivery requirements
GB/T 30062, Terminology of steel tubular products and tubes
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 17505,
GB/T 30062 as well as the followings apply.
3.1 packaging
The operational activities in which, to protect products during circulation, facilitate
storage and transportation, and promote sales, strapping materials (3.3), containers and
auxiliary materials are used, and certain technical methods are applied to wrap, bundle
or place one or more steel tubular products in containers to form a cargo unit.
3.2 strapping package, binding
A packaging (3.1) method in which steel tubular products are bound, fixed or reinforced
with strapping materials (3.3).
test unit
According to product standards or contract requirements, based on the test conducted
on the sampled products, the number of roots or tons of products that are accepted or
rejected at one time.
[Source: GB/T 17505-2016, 3.6, modified]
4 Acceptance rules
4.1 Inspection and acceptance
The quality of steel tubular products shall be inspected and accepted by the technical
quality supervision department of the manufacturer. The supplier shall ensure that the
delivered steel tubular products comply with the corresponding product standards or
the provisions of the contract. The purchaser has the right to re-inspect according to the
corresponding product standards or contracts.
4.2 Batching rules
Steel tubular products shall be inspected and accepted in batches. The batching shall
comply with the corresponding product standards, or the rules stipulated in the contract.
4.3 Inspection item, sampling quantity, sampling method and test method
The inspection item, sampling quantity, sampling method and test method of the steel
tubular products shall comply with the relevant product standards or the provisions of
the contract.
4.4 Determination of impact test results
4.4.1 A group of 3 specimens shall be used for the impact test of a single sampled steel
tubular product. The average value of a group of 3 specimens shall not be less than the
specified value (average value). The value (single value) of one specimen is allowed to
be lower than the specified value. But it shall not be lower than 70% of the specified
value.
4.4.2 If the results of a group of 3 specimens of a single sampled steel tubular product
do not meet the requirements of 4.4.1, but no more than 2 specimens are lower than the
specified value and when no more than 1 specimen is less than 70% of the specified
value, a group of 3 specimens can be taken from the same sampling steel tubular product
for testing. After the second group of specimen tests, if the following conditions are met
at the same time, the sampled steel tubular product shall be determined as accepted,
otherwise the sampled steel tubular product shall be rejected:
a) The average value of 6 specimens is not less than the specified value;
b) No more than 2 specimens are below the specified value;
c) No more than 1 specimen is less than 70% of the specified value.
4.5 Reinspection and determination
4.5.1 For the test results representing a batch of steel tubular products, when a certain
item does not meet the requirements of the product standard, the manufacturer can
randomly take double the number of specimens from the same batch of remaining steel
tubular products for the reinspection of the rejected item. The test requirements and
determination rules for the impact test of each retested steel tubular product shall
comply with the provisions of 4.4. If all the reinspection results (including any index
required by the test item) meet the product standards or the provisions of the contract,
except for the rejected steel tubular products in the initial inspection, this batch of steel
tubular products will be determined as accepted.
4.5.2 If the initial inspection fails, the following inspection items are not allowed to be
reinspected:
a) White dots in low-magnification tissue defects;
b) Microstructure, grain size, decarburization layer in metallographic inspection.
4.5.3 If the reinspection result is rejected or the initial metallographic inspection is
rejected, the manufacturer may inspect the remaining steel tubular products of the batch
one by one or conduct heat treatment again for the whole batch. The re-heat-treated
steel tubular products shall be reinspected and accepted as a new batch. The number of
reheat treatments for steel tubular products shall not exceed 2 times.
4.6 Acceptance of chemical composition
If there is no special regulation in the product standard or contract, the chemical
composition of the steel tubular product shall be checked and accepted according to the
melting composition.
4.7 Numerical rounding off
When it is necessary to evaluate whether the test result conforms to the specified value,
the test result shall be rounded to be consistent with the number indicated by the last
digit of the specified value. The rounding-off method shall comply with the provisions
of GB/T 8170.
5 Packaging
5.1 General requirements
both ends of the steel tubular product with beveled tubular product ends.
5.6.3 When required by the purchaser, support frames can be added at both ends of the
large-diameter thin-walled steel tubular product.
6 Marks
6.1 General requirements
6.1.1 The marks of steel tubular products shall be eye-catching and firm. The
handwriting shall be clear, standardized, and not easy to fade.
6.1.2 Steel tubular products with an outer diameter not less than 36mm shall be marked
one by one. Steel tubular products with an outer diameter less than 36mm may not be
marked one by one. Steel tubular products used for galvanizing and special-shaped steel
tubular products with complex cross-sections do not need to be marked one by one.
6.1.3 When spray-printing, stamping ...