GB/T 13793-2016Steel pipes with a longitudinal electric (resistance) weld (English PDF)

1 Scope

GB/T 13793-2016 is the Chinese national standard on steel pipes with a longitudinal electric (resistance) weld, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 29 August 2016 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 July 2017. Classification: ICS 77.140.75, CCS H48. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

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.

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.

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Note 3. 10. **Verification (USD

Notes and Explanations

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