Differences between and Selection of CCS Grade A, B, D and E Normal-Strength Marine Steel Plates
- May 14, 2026
Knowledge
CCS Grade A Shipbuilding Steel Plate Dimensions and Tolerances
1. Standard Dimensions
1.1 Thickness Range
Standard rolled thickness: 3 - 300 mm
Common thickness for shipbuilding: 5 - 40 mm
Heavy-duty structural plates: 40 - 100 mm
Extra-thick special-purpose plates: up to 300 mm
Typical applications:
5 - 20 mm: ship compartment bulkheads, deck hatches
20 - 40 mm: Ship bottom plates, side plates
1.2 Width Range
Standard widths: 1200 - 4200 mm
Common fixed widths: 1500, 1800, 2000, 2400, 3000 mm
Custom widths: Up to 4500 mm (reducing the number of weld seams and improving hull watertightness)
1.3 Length Range
Standard lengths: 3000 - 18000 mm
Standard factory lengths: 6000, 12000 mm
Custom lengths: Support for extra-long lengths to accommodate integrated cutting of large hull sections
2. Dimensional Tolerance Standards (in accordance with GB/T 712 and CCS specifications)
2.1 Thickness Tolerances
| Thickness | Tolerance |
|---|---|
| ≤ 10 mm | ±0.5 mm |
| 10 - 20 mm | ±0.7 mm |
| 20 - 50 mm | ±1.0 mm |
| > 50 mm | ±1.5 mm |
2.2 Width Tolerances
| Width | Tolerance |
|---|---|
| ≤ 2500 mm | ±5 mm |
| > 2500 mm | ±8 mm |
* For export orders, negative tolerances (-0.3 / 0 mm) are generally applied to facilitate assembly and construction at shipyards.
2.3 Length Tolerances
| Length | Tolerance |
|---|---|
| ≤ 12000 mm | ±10 mm |
| > 12000 mm | ±15 mm |
* For export orders, negative tolerances (-0.3 / 0 mm) are generally applied to facilitate assembly and construction at shipyards.
2.4 Flatness Tolerances
| Flatness | Tolerance |
|---|---|
| Per meter | ≤ 3 mm |
| Total (length ≤ 12000 mm) | ≤ 10 mm |
* No waviness or sickle-bend is permitted to ensure the flatness of hull assembly.
3. Customised Processing Services
CCS Grade A shipbuilding steel plates support the following processing services:
Custom cutting: flame cutting, plasma cutting, laser cutting
Z-direction properties: Z15 / Z25 / Z35
Surface treatment: Sa2.5 shot blasting, epoxy primer coating
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