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Common Delivery Conditions for CCS EH36 Shipbuilding Steel Plates
CCS EH36 shipbuilding steel plates have extremely high requirements for low-temperature toughness; therefore, delivery in the hot-rolled condition is generally not permitted. Depending on CCS specifications and the thickness of the steel plate, the common delivery conditions for CCS EH36 high-strength shipbuilding steel plates are TMCP, normalised and quenched and tempered. Additional conditions such as Z-direction property testing, non-destructive testing and surface treatment may also be selected.
Heat Treatment Techniques for CCS EH32 Shipbuilding Steel Plates
Heat treatment is a key process that determines the mechanical properties, flatness and service life of CCS EH32 shipbuilding steel plates. Improper processing can lead to insufficient low-temperature toughness, uneven hardness and reduced weldability, thereby failing to pass the certification inspection by the China Classification Society (CCS). Currently, two main heat treatment processes are used for CCS EH32 shipbuilding steel plates: normalising and TMCP (Thermomechanical Control Processing).
Equivalent Materials for CCS DH36 Steel
CCS DH36 is a high-strength hull structural steel certified by the China Classification Society (CCS), with core properties including: yield strength ≥355 MPa, tensile strength 490–630 MPa, and impact energy ≥34 J (longitudinal) at –20 °C. It has direct equivalents in the standards of major classification societies worldwide; these grades have essentially identical chemical compositions and mechanical properties and can be used interchangeably, provided that certification from the relevant classification society is provided.
Storage, Transport and Corrosion Prevention of CCS DH36 Shipbuilding Steel Plates
When procuring CCS DH36 shipbuilding steel plates, attention must not only be paid to the production quality of the product, but also to the standardised management of storage, transport and corrosion prevention. Improper daily management can easily lead to surface rusting, plate deformation and a decline in internal properties, thereby affecting the quality of subsequent welding and assembly.
Welding Process for CCS DH32 Shipbuilding Steel Plates
CCS DH32 shipbuilding steel plate has a low carbon equivalent (CEV) and offers good overall mechanical properties and weldability. It is widely used in the manufacture of critical load-bearing components for bulk carriers, container ships and offshore platforms, and its weld quality directly affects the overall structural safety and service life of the vessel. To ensure the low-temperature toughness of the welds, it is essential to select appropriate welding methods and compatible welding consumables, carry out thorough pre-welding preparation, strictly control heat input and interpass temperatures during the welding process, perform post-weld heat treatment, and rigorously inspect the weld quality.
