GB/T 38877-2020 in English
VALIDInsulating coatings for the electrical steel strip( sheet)
- Issued on:2020-06-02
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 38877-2020电工钢带（片）绝缘涂层》由TC183（全国钢标准化技术委员会）归口，TC183SC6（全国钢标准化技术委员会钢板钢带分会）执行，主管部门为中国钢铁工业协会。
Introduction
Interpretation of the core content of the standard
This standard specifies the technical specifications for the surface insulation coating of cold-rolled electrical steel strip (sheet), focusing on solving the eddy current loss problem caused by short circuit between core laminations. The coating system is divided into 7 categories and 12 categories according to the inorganic/organic components, including:
| Coating type | Temperature resistance grade | Typical application | Key characteristics |
|---|---|---|---|
| DJ-3-2 | ≤180℃ | Pressing sheet | Bonded after curing, low vibration and noise |
| DJ-5-G | 850℃ | Oriented electrical steel | Generate rolling tensile stress to improve magnetic properties |
| DJ-6 | 180℃ | Full-process steel strip | Excellent insulation + punching performance |
Analysis of key technical indicators
9 core tests required by the standard:
- Insulation resistance test: Distinguish surface resistance (Ω·mm²/surface) and interlayer resistance (Ω·mm²/piece) according to GB/T 2522
- Heat resistance: DJ-5-N can withstand 800℃ annealing, DJ-3 series is limited to working conditions below 180℃
- Salt spray test: Verify the corrosion resistance of the coating through GB/T 10125
Case: A motor factory selected DJ-3-2 coated steel strip is used to make the iron core. After punching, it is subjected to the pressure-maintaining and curing process, which increases the shear strength between the laminations by 40% and reduces the electromagnetic noise by 15dB.
Implementation suggestions
- Selection basis: Refer to Appendix A and the ASTM/IEC standard comparison table. Export products are recommended to meet the requirements of C-5 level (ASTM A976) at the same time
- Storage management: The storage period of B-state coating (such as DJ-3-2) is ≤6 months, and the temperature and humidity need to be controlled
- Process adaptation: Decomposition gas emissions need to be considered during welding of coatings containing organic components (DJ-3/DJ-6)
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