GB/T 4956-2025Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method (English PDF)
磁性基体上非磁性覆盖层 覆盖层厚度测量 磁性法
Also coversGB/T4956-2025 + GBT4956-2025
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 31, 2025
Implementation date
May 1, 2026
Scope
GB/T 4956-2025 is the English-translated version of 磁性基体上非磁性覆盖层 覆盖层厚度测量 磁性法.
Measuring the thickness of a coating on steel is routine in painting, plating and galvanizing operations. This standard describes a magnetic method for measuring the thickness of non-magnetic coatings on magnetic substrates, which covers many common coating systems on iron and steel parts. It is a recommended national standard.
Coating applicators, plating and galvanizing plants, fabricators, third party inspectors, metrology laboratories and gauge manufacturers are its natural readers. Purchasers who include coating thickness inspection in their contracts can also use it to define the measurement approach.
It was issued on 31 October 2025 and takes effect on 1 May 2026, replacing GB/T 4956-2003. Because the earlier edition is more than two decades old, shops that still follow it should review their gauge calibration and reporting practice against the current text.
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Document preview — GB/T 4956-2025
National Standard of the People's Republic of China
- ICS
- 25.220.40;25.220.50
- Classification
- A29
- Replacing
- GB/T 4956-2003
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
GB/T 4956-2025 is a recommended national standard (GB/T) of the People's Republic of China, issued on 31 October 2025 by the State Administration for Market Regulation and the Standardization Administration of China, with effect from 1 May 2026.
This edition replaces GB/T 4956-2003.
The document adopts an international standard (ISO or IEC).
It is under the responsibility of the China Machinery Industry Federation.
Classification: ICS 25.220.40;25.220.50; CCS A29.
1 Scope
Measuring the thickness of a coating on steel is routine in painting, plating and galvanizing operations. This standard describes a magnetic method for measuring the thickness of non-magnetic coatings on magnetic substrates, which covers many common coating systems on iron and steel parts. It is a recommended national standard.
Coating applicators, plating and galvanizing plants, fabricators, third party inspectors, metrology laboratories and gauge manufacturers are its natural readers. Purchasers who include coating thickness inspection in their contracts can also use it to define the measurement approach.
It was issued on 31 October 2025 and takes effect on 1 May 2026, replacing GB/T 4956-2003. Because the earlier edition is more than two decades old, shops that still follow it should review their gauge calibration and reporting practice against the current text.
Remaining clauses in the full document
- 2 Normative references
- 3 Terms and definitions
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 31 pages — is available in the English PDF.
Referenced standards
Cited by
- GB 16669-2026General technical specifications for carbon dioxide fire extinguishing systems and components
- GB/T 31304-2026Epoxy-coated high strength wire stay cable
- GB/T 47886-2026Metallic and other inorganic coatings - Electrodeposited silver and silver alloy coatings for engineering purposes - Specification and test methods
- GB/T 12333-2025Metallic coatings - Electroplated coatings of copper for engineering purposes
- GB/T 18226-2025Specification for steel component anticorrosion of highway traffic engineering
- GB/T 26110-2025Zinc-aluminium flake coatings - Technical specification
Editions of GB/T 4956
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4956-2025 | Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method | current edition | Current |
| GB/T 4956-2003 | Oon-magnetic coatings on magnetic substrates?Measurement of coating thickness?Magnetic method | previous edition | In force until 1 May 2026 |
This page sells the current edition, GB/T 4956-2025. Earlier editions are listed for reference only.
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