Products FAQ
What are the welding properties of P265NB steel sheet?
It has excellent welding properties. Due to its low carbon equivalent (CEV), good welds can usually be achieved without the need for complex preheating. Low-hydrogen welding procedures are recommended. If the steel sheet is thick or the ambient temperature is too low (<5 °C), it is advisable to preheat the material to between 50 and 100 °C.
What are the weldability characteristics of CCS Grade E shipbuilding steel plates?
They are excellent. Due to its low carbon equivalent (CEV), Grade E offers excellent weldability and is not prone to weld cracking.
However, as it is intended for use in low-temperature environments, it is essential to use low-hydrogen welding consumables certified by the classification society, control the heat input, and carry out pre-welding preheating and post-welding treatment to prevent a reduction in low-temperature toughness at the weld.
What is the difference between CCS Grade D and CCS Grade E shipbuilding steel plates?
Key difference: Different low-temperature impact toughness.
CCS Grade D steel: Impact test temperature is -20°C.
CCS Grade E steel: Impact test temperature is -40°C.
Under what circumstances is Z-direction testing required for CCS Grade E shipbuilding steel plates?
When CCS Grade E steel plates are used in thick-plate welded T-joints or fillet joints on offshore platforms, and the stress direction is perpendicular to the plate surface, Z-direction performance testing (Z15 / Z25 / Z35) is strongly recommended to prevent the occurrence of laminar tearing.
Is CCS Grade E steel equivalent to the grades of other classification societies?
Yes. In accordance with the IACS (International Association of Classification Societies) unified rules, CCS Grade E is equivalent to ABS Grade E, LR Grade E, DNV Grade E and BV Grade E. They possess similar chemical and mechanical properties.
In which parts of a ship is CCS Grade D steel plate primarily used?
CCS Grade D General-strength structures for primarily cold-water / high-latitude routes:
Hull shell, deck, sides, bulkheads.
Keel, inner bottom plates, frames, stringers.
Non-critical high-strength sections of bulk carriers, container ships, oil tankers and offshore platforms.
What is the main difference between CCS Grade A steel and CCS Grade D steel?
The main difference between the two lies in the temperature requirements for impact testing.
CCS Grade A: No impact testing is required for standard thicknesses (≤50 mm); impact testing in accordance with the specifications is only required when the thickness exceeds 50 mm.
CCS Grade D: A Charpy V-notch impact test must be conducted at 0°C to ensure safe use in colder marine environments.
What delivery conditions are available for CCS Grade D shipbuilding steel plates?
Depending on the plate thickness and your structural requirements, we can supply CCS Grade D plates in the following conditions: as-rolled (AR), controlled rolling (CR), normalised (N) or thermomechanically control process (TMCP).
Can you provide a CCS 3.2 certificate for Grade D shipbuilding steel plates?
Yes. All our shipbuilding steel plates come with original factory test certificates (MTCs) stamped and approved by surveyors from the China Classification Society (CCS) in accordance with EN 10204 3.2.
How can one verify the authenticity of CCS B shipbuilding steel plates?
The authenticity of CCS B shipbuilding steel can primarily be verified in the following two ways:
1. Check the physical markings
Inspect the spray-painted or stamped markings on the ends or surface of the steel plate to confirm that the CCS (China Classification Society) logo is clearly visible.
2. Verify consistency between the quality assurance certificate and the steel plate information
Request the supplier to provide the CCS Product Inspection Certificate and verify that the furnace batch number matches the spray-painted code on the steel plate exactly. If necessary, you may apply to the relevant CCS branch for a re-inspection to further confirm authenticity.
