GB/T 15675-2020Continuously electrolytically zinc/zinc-nickel alloy coated steel sheet and strip (English PDF)

1 Scope

GB/T 15675-2020 is the Chinese national standard on continuously electrolytically zinc/zinc-nickel alloy coated steel sheet and strip, 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 September 2020 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 April 2021. Classification: ICS 77.140.50, CCS H46. 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 terms and definitions, designation expression method, classification and code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificates for continuously electrolytically zinc/zinc-nickel alloy coated steel sheet and strip. This Standard is applicable to electrolytically zinc/zinc-nickel alloy coated steel sheet and strip used in automobiles, home appliances, electronics and other industries (hereinafter referred to as steel sheet and strip).

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 247, General rule of package mark and certification for steel plates (sheets) and strips

GB/T 708, Dimension, Shape, Weight, and Tolerance for Cold-Rolled Steel Plates

GB/T 1839-2008, Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products

GB/T 5213, Cold rolled low carbon steel sheet and strip

GB/T 8170, Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests

GB/T 17505, Steel and steel products - General technical delivery requirements

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 electrolytic zinc coating; ZE a coating that is composed of pure zinc and produced by continuous electrolytically zinc production line through electroplating; the coating does not contain any trace elements that are harmful to the bonding force of the binder or the paint performance

3.3 anti-fingerprint treatment conduct electrolytic passivation treatment on the surface of steel sheet and strip and apply with anti-fingerprint film, so as to improve the stain resistance of electronic or electrical products

4 Designation expression method, classification and code

4.1 Designation expression method The designation of steel sheet and strip is composed of two parts. substrate designation and coating type. They are connected with "+" in the middle.

5 Order content

5.1 The contract or order for placing an order in accordance with this Standard shall include the following.

5.2 If the size and unevenness accuracy, surface quality level and packaging method are not specified in the order contract, then the normal size, unevenness accuracy, and surface quality level are high level surfaces.

6 Size, shape, weight

6.1 The nominal thickness of steel sheet and strip is the sum of the thickness of the substrate and the thickness of the coating.

6.2 The size, shape and allowable deviation of steel sheet and strip shall meet the requirements of GB/T 708.

7 Technical requirements

7.1 Substrate Steel sheet and strip can use products in GB/T 5213, GB/T 20564 (all parts) as substrates. According to the negotiation between the supplier and the purchaser, products other than the above-mentioned standards can also be used as the substrate.

7.3 Smelting method Steel shall be smelted by oxygen converter or electric furnace. Unless otherwise specified, the smelting method is chosen by the supplier.

8 Test methods

The inspection item and test method of each batch of steel sheets and strips shall meet the requirements of Table 6.

9 Inspection rules

9.1 The inspection and acceptance of steel sheets and strips are carried out by the supplier's inspection department.

9.2 Steel sheets and strips shall be inspected in batches.

9.3 The number of samples, sample size and sample position of the test items for each batch of steel sheets and strips shall meet the requirements of Table 6.