GB/T 33814-2017 English PDF (GBT33814-2017)
GB/T 33814-2017 English PDF (GBT33814-2017)
GB/T 33814-2017: Welded H-section steel
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Welded H-section steel
ISSUED ON. MAY 31, 2017
IMPLEMENTED ON. FEBRUARY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 5
4 Code and specification representation method ... 6
5 Dimension, shape, weight and permissible deviation ... 6
6 Technical requirements and production ... 12
7 Inspection rules ... 14
8 Packaging, marking and quality certificate ... 19
Annex A (informative) Cross-sectional dimension, cross-sectional area,
theoretical weight and cross-sectional characteristic parameters of welded H- section steel ... 21
Welded H-section steel
This Standard specifies the ordering content, code and specification
representation method, dimension, shape, weight and permissible deviation, technical requirements and production, inspection rules, packaging, marking and quality certificate of welded H-section steel.
This Standard applies to the selection, fabrication and acceptance of welded H-section steel.
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 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 232 Metallic materials - Bend test
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 712 Ship and ocean engineering structural steel
GB/T 714 Structural steel for bridge
GB/T 1591 High strength low alloy structural steels
GB/T 2101 General requirement of acceptance, packaging, marking and
certification for section steel
GB/T 2537 Carbon dioxide for welding
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
a) Product name and model, specifications;
b) Steel grades;
c) Standard number;
d) Delivery length;
e) Weight and quantity;
f) Other special requirements proposed by the demand party, including
special specifications, special surface quality requirements, etc.
4 Code and specification representation method
The code of welded H-section steel is WH, where ?€?W?€? represents welded and ?€?H?€? represents H-section steel.
4.2 Specification representation
The specification of welded H-section steel shall be expressed in the following form.
WH height (H) ?? width (B) ?? web thickness (t1) ?? flange plate thickness (t2). Example. WH1500 ?? 500 ?? 18 ?? 30
5 Dimension, shape, weight and permissible deviation
5.1 Dimension and representation method
5.1.1 The cross-sectional view and symbols of welded H-section steel are shown in Figure 1.
5.3 Weight and permissible deviation
Welded H-section steel shall be delivered according to the theoretical weight (the theoretical weight shall be calculated regarding the density as 7.85 g/cm3). Agreed upon between he supply and demand parties and specified in the
contract, it may delivery according to the actual weight. Unless contracted, the weight deviation of a single piece of welded H-section steel shall not exceed ??6 %, and the weight deviation of batch delivery shall not exceed ??4 %. 6 Technical requirements and production
6.1.1 Steel used for welded H-section steel shall comply with the specifications of relevant standards such as GB/T 699, GB/T 700, GB/T 712, GB/T 714, GB/T 1591, GB/T 3274, GB/T 4171, GB/T 19879. When the welded H-section steel adopts Z-direction performance steel, the Z-direction performance of the steel shall comply with the specifications of GB/T 5313. Agreed upon between he supply and demand parties and specified in the contract, steels specified in other standards may also be used.
6.1.2 When the surface of the steel used for welded H-section steel has defects such as rust, pitting or scratch, the depth shall not exceed one-half of the negative permissible deviation of the thickness of the steel. The defects on the surface of the steel shall be allowed to be removed by mechanical means such as shoveling and polishing, and allowed to be repaired by welding; the repair process and quality inspection shall comply with the specifications of GB 50661. 6.1.3 The site reinspection rules for the chemical composition and the
mechanical properties of the steel used for welded H-section steel shall comply with the specifications of GB 50205.
6.2 Welding materials
6.2.1 The welding material used for welded H-section steel shall comply with the specifications of relevant standards such as GB/T 2537, GB/T 4282, GB/T 5117, GB/T 5118, GB/T 5293, GB/T 8110, GB/T 10045, GB/T 12470, GB/T
6.2.2 The welding material used for welded H-section steel shall be re- inspected according to the production batch number. If the source of the certified product is stable and the three consecutive batches pass the site reinspection on the very first try, the capacity of the inspection batch may be doubled for the site reinspection. In the case of the inspection after the expansion of the inspection batch, if it fails, it shall be re-accepted before the 6.4.1 Welders engaged in the manufacture of welded H-section steel shall take technical qualification examinations according to the requirements of steel type, welding joint form, welding method, welding position, etc., and obtain the corresponding certificate of conformity. The certified welder shall weld within the recognize range of the certificate of conformity.
6.4.2 Welding technicians and welding inspectors engaged in the manufacture of H-section steel shall comply with the relevant specifications of CECS 331 and obtain corresponding qualification certificates.
6.4.3 When the contract drawings or technical documents require post-weld heat treatment, the heat treatment process, equipment and personnel shall comply with the specifications of relevant standards.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The Inspection and acceptance of welded H-section steel finished
products shall be organized by the quality supervision department of the production organization.
7.1.2 The production organization shall ensure that the delivered steel meets the requirements of this Standard or the contract. The demand party has the right to inspect and accept any of the inspection items specified in this Standard or contract.
7.2 Batching rules
The inspection batch of welded H-section steel shall be determined according to product specification, raw material and welding process. The same batch of welded H-section steel shall have the same specification, using steel and welding materials of the same grade (model), quality grade, delivery conditions, and using the same processing and welding process; each batch is not more than 300 t.
7.3 Sampling rules
7.3.1 The sampling method for the chemical composition inspection of welded H-section steel shall be in accordance with the relevant specifications of GB/T 20066. The sampling part and sampling method of the mechanical property test shall be in accordance with the relevant specifications of GB/T 2975. If the manufacturer can provide the corresponding raw material site reinspection reports and traceability materials, the finished product inspection may be exempted from the sampling test of chemical and mechanical properties, or the 7.5.2 Non-destructive testing
188.8.131.52 The non-destructive testing shall be carried out after passing the appearance inspection. Specifically, it shall comply with the relevant
specifications of GB 50661-2011.
184.108.40.206 For welds required full penetration, the test for internal imperfections shall comply with the following specifications.
a) Grade I welds shall be 100 % tested, and the qualification level shall comply with the requirements of level II or above level II of Grade B
inspection in GB 50661-2011;
b) Grade II welds shall be subjected to sampling inspection. The sampling inspection ratio shall not be less than 20 %. The qualification level shall comply with the requirements of level III or above level III of Grade B inspection in GB 50661-2011.
220.127.116.11 Grade III welds shall be tested in accordance with design requirements. 18.104.22.168 In the case of one of the following conditions, it should ultrasonically test the flange plate at the joint groove before welding or test the layered tear of the flange plate after welding.
a) It is found that the steel plate has an interlayer imperfection;
b) Non-Z-direction performance steel plates with the thickness of flange plate and web of not less than 20 mm;
c) The thickness of web is greater than that of flange plate, and the working stress perpendicular to the thickness direction of the flange plate is greater. 22.214.171.124 Radiation test method may be used to supplement the test as needed. 126.96.36.199 Radiation testing shall comply with the relevant specifications of GB/T 3323-2005. The quality grade of radiography shall comply with the
requirements of Grade B. The qualification grade of Grade I welds shall be Grade II and above, and the qualification grade of Grade II welds shall be Grade III and above.
188.8.131.52 In the case one of the following conditions, it shall carry out surface non- destructive testing.
a) The design document requires surface non-destructive testing;
b) When cracks are found in the appearance inspection, 100 % surface non- destructive testing shall be carried out for similar welds in the batch; and the qualified ones can still be delivered.
7.7.2 The results of sampling inspection of welds shall be judged according to the following specifications.
a) If the rejection rate of welds in the sampling inspection is less than 2 %, the acceptance of the batch is qualified;
b) If the rejection rate of welds in the sampling inspection exceeds 5 %, the acceptance of the batch is unqualified;
c) if the rejection rate of welds in the sampling inspection is 2 % ~ 5 %, it shall double the samples for inspection, and one weld extension line on both sides of the original unqualified part shall be added, and the failure rate shall be exceeded in all the sampling welds. If it is not more than 3%, the batch is qualified; if it is more than 3%, the batch is unqualified; d) When the batch acceptance is unqualified, all the remaining welds in the batch shall be inspected;
e) If a crack defect is found in the inspection, it shall double the samples for inspection. If the crack defect is not found again in the double-sampling inspection, the acceptance of the batch is qualified. If many crack defects are found in the inspection or the crack defects are found in the double- sampling inspection, the acceptance of the batch is unqualified, all the remaining welds in the batch shall be inspected;
f) The supply party shall repair the unqualified welds in accordance with the relevant specifications of GB 50661-2011, and deliver them after passing the reinspection.
8 Packaging, marking and quality certificate
8.1 Welded H-section steel shall be marked with the name or registered
trademark of the manufacturer by means of stamping, spraying or affixing. The marking shall be clear and the marking location shall be at the end of the web. 8.2 Welded H-section steel finished products shall be marked with the factory- exit number, the grade of the steel used and the inspector's symbol or steel letter for examination.
8.3 Each batch of welded H-section steel shall be accompanied by a quality certificate issued by the supply party, which states.
a) the name of the demand party and the contract number;