GB/T 13790-2025Cold rolled low carbon steel sheet and strip for vitreous enamelling (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part

1.Rules for the Structure and Drafting of Standardizing Documents. This document serves as a replacement for GB/T 13790-2008 Cold Rolled Low Carbon Steel Sheets and Strips for Vitreous Enamelling and GB/T 29515-2013 Cold Rolled Steel Sheet for Enamelling - Fish-scaling Sensitivity Test - Hydrogen Permeation Method. In comparison with GB/T 13790-2008, apart from structural adjustments and editorial modifications, the main technical changes are as follows:

a) The thickness range is modified (see Chapter 1; Chapter 1 of Version 2008);

b) Terms and definitions are added (see Chapter 3);

c) Drawing grades 04, 06 and 07 are added (see Table 1);

d) Ultra-high-grade surface FD is added (see Table 2);

e) Classification and codes based on edge state are added (see Table 4);

f) Enamel processing type ED is added to the designation representation method (see 4.2);

g) Six designations - DC04EK, DC06EK, DC07EK, DC03ED, DC04ED and DC06ED, as well as their corresponding technical requirements are added (see Table 5, Table 6 and Table 7);

h) The C, Mn, Als and Ti provisions for some designations are modified (see Table 5; Table 4 of Version 2008);

i) The provisions for the mechanical properties of DC01EK, DC03EK and DC05EK are modified (see Table 6; Table 5 of Version 2008);

j) The provisions for a 6-month guarantee period for mechanical properties are added (see 7.2);

k) The provisions for tensile strain marks are modified (see Table 7; Table 6 of Version 2008);

l) A hydrogen permeation test is added (see 7.4.1);

1 Scope

GB/T 13790-2025 is the Chinese national standard on cold rolled low carbon steel sheet and strip for vitreous enamelling, 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 1 August 2025 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 February 2026. 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 document specifies the classification and designation representation method, ordering content, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking and quality certificate for cold rolled low carbon steel sheet and strip for vitreous enameling. This document applies to cold rolled low carbon steel sheet and strip with a thickness of

0.30 mm ~

3.50 mm and a width of not less than 600 mm used in the daily-use or industrial vitreous enameling industry (hereinafter referred to as the "sheet and strip").

2 Normative References

The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products

GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum Content - Chrome Azurol S Photometric Method

GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Photometric Method for the Determination of Titanium Content

GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method

GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method

GB/T 223.63 Iron, Steel and Alloy - Determination of Manganese Content - Sodium (potassium) Periodate Spectrophotometric Method

GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method

GB/T 223.85 Steel and Iron - Determination of Sulfur Content - Infrared Absorption Method after Combustion in an Induction Furnace

GB/T 228.1-2021 Metallic Materials - Tensile Testing - Part

3 Terms and Definitions

The following terms and definitions are applicable to this document.

3.1 hydrogen permeation test A test method that evaluates the fish scaling resistance of steel sheet for vitreous enameling by generating atomic hydrogen on one side of the cold rolled steel sheet, allowing it to permeate through the steel sheet to the other side and precipitate as hydrogen gas, and through the time required for the hydrogen gas to stabilize.

5 Ordering Content

5.1 Contracts or orders placed in accordance with this document shall include at least the following contents.

a) Serial number of this document;

b) Product name (steel sheet or strip);

d) Specifications and dimensions, unevenness accuracy;

f) Surface quality level;

g) Surface texture;

h) Packaging mode;

k) Other special requirements.

5.2 If the ordering contract does not specify dimensions, unevenness accuracy, surface quality level, surface texture, edge state, and packaging information, etc., then, the products shall be supplied as trimmed steel sheet or strip with ordinary dimensions and unevenness accuracy, relatively advanced surface, and a pitted surface, and packaged in accordance with the packaging mode provided by the supply-side.

6 Manufacturing Process

6.1 Steel should be smelted in an oxygen converter or electric arc furnace. Unless otherwise specified, the smelting method shall be selected by the supply-side.

6.2 Steel sheet and strip shall be delivered in an annealed, flat state.