Ship's Eye Plate
1Key Takeaways
This standard provides specifications for the design, materials, and testing of eye plates used in maritime applications. It outlines the requirements for dimensions, load-bearing capacity, and surface treatment to ensure the structural integrity and safety of these components. The document also includes guidelines for…
2Expert Interpretation
An in-depth interpretation of the CB/T 4567-2025 marine eye plate industry standard, covering the classification marking, material requirements, strength testing and inspection rules of 6 major types of eye plates, and comparing the 1999 version of the standard with new technical changes such as stainless steel materials and extended specifications.
Background of Standard Revision and Technological Evolution
CB/T 4567-2025, as the key outfitting standard for the shipbuilding industry, replaces the CB/T 60-1999 version that has been implemented for 26 years. This revision mainly responds to the new requirements of the International Convention for the Safety of Life at Sea (SOLAS), introduces stainless steel materials to cope with marine corrosive environments, and expands the specification range to match the trend of large-scale modern ships.
Eye plate classification and marking system
| Type | Name | Allowable load range (kN) | Material options | Typical applications |
|---|---|---|---|---|
| Type A | Ordinary round hole eye plate | 4.9-98.0 | Carbon steel/stainless steel | Conventional mooring |
| Type E | Forged steel triangle eye plate | 3.9-490.0 | High quality carbon steel | Heavy lifting |
| F Type | Reinforced round hole plate | 3.9-784.0 | Carbon steel/stainless steel | High stress area |
Marking example: A2.0G represents a carbon steel ordinary round hole plate with an allowable load of 19.6kN, and B3.0N represents a stainless steel round steel welded eye plate with an allowable load of 29.4kN.
Key Technical Requirements
Material Specifications
- Carbon Structural Steel: Q235B (GB/T 700-2006)
- Stainless Steel: 06Cr17Ni12Mo2 (GB/T 3280-2015)
- Forgings: 25# High Quality Carbon Steel (GB/T 699-2015)
Strength Verification
All eye plates shall pass a tensile test of 200% allowable load for 5 minutes. After the test, the following shall not occur:
① Visible cracks ② Permanent deformation > 4% of dimensional tolerance
Surface treatment
| Environment | Processing requirements | Standard basis |
|---|---|---|
| Ballast tanks | Sa2.5 grade rust removal + PSPC coating | SOLAS II-1/3-2 |
| Open air area | Hot dip galvanizing (≥70μm) + primer | CB/Z 343 |
| Stainless steel | Passivation treatment | GB/T 20878 |
Implementation suggestions
- Selection and matching: Select the corresponding shackle specifications according to CB/T 32 standard. Pay special attention to the dynamic load factor for E-type eye plate
- Welding control: The transition zone between the plug weld and the fillet weld of the B-type eye plate should be tested by MT
- Anti-corrosion maintenance: Stainless steel eye plates should avoid direct contact with carbon steel to prevent electrochemical corrosion
Typical application case
A 200,000-ton bulk carrier uses F50.0N stainless steel eye plates, which withstood a 490kN proof load test at the cargo hold cover lifting point, and its 210mm aperture tolerance is controlled within the range of +2/-1mm.