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Pipe Coating
There are three common types of the anti-corrosion steel pipes structure in the picture
Performance indexes of single-layer anti-corrosion pipe
No | Item | Performance Index |
1 | Adhesion | ≤ 2 |
2 | Cathodic Disbonding(65℃，48h). mm | ≤ 8 |
3 | Cathodic Disbonding(65℃，30d) /mm | ≤ 15 |
4 | Bending resistance(-20℃, 2.5°) | No cracks |
The coating thickness of the laboratory sprayed specimen should be 300μm~400μm. | ||
Performance indexes of double-layer anti-corrosion pipe
No | Item | Performance Index | Testing Method |
1 | Softening point. ℃ | 90 | GB/T 4507 |
2 | Evaporation loss(160℃). % | ≤ 1.0 | GB/T 11967 |
3 | Shearing strength(PE/steel). MPa | ≥ 1.0 | GB 7124 |
4 | Peel strength(PE/steel). N/cm | ≥ 35 | GB 2792 |
(20±5℃) | |||
Performance indexes of triple-layer anti-corrosion pipe
No | Item | Performance Index | Testing Method |
1 | Density, g/cm | 0.92-0.95 | GB 4472 |
2 | Flowing rate, g/10min(190℃=2.16kg) | ≥0.7 | GB 3682 |
3 | Vicat softening point, ℃ | ≥90 | GB 1633 |
4 | Embrittlement temperature, ℃ | ≤ -50 | GB 5470 |
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