Cutting Conditions for Marine Steel Plates

Marine steel plates are widely used in shipbuilding, particularly grades such as AH36, DH36, and EH36. Cutting is essential in shaping these plates into key structural components, including hull sections, decks, bulkheads, stiffeners, and transverse frames. Accurate cutting ensures proper assembly, which directly affects the vessel’s strength and durability.
 
Several cutting techniques are applied depending on plate thickness and precision requirements. Oxy-fuel cutting is commonly used for thick plates due to its efficiency and cost-effectiveness, while plasma cutting offers higher speed and better edge quality for medium-thickness materials. Laser cutting is suitable for thinner plates and detailed components, delivering high precision with minimal distortion.
 
Temperature control is critical when cutting marine steel plates. Excessive heat input can lead to large heat-affected zones (HAZ), resulting in microstructural changes and reduced toughness. Preheating may be required for thicker plates or higher-strength steels to prevent cracking, while controlled cooling helps maintain the desired mechanical properties.
 
Mechanical properties such as strength, toughness, and ductility must be preserved during cutting. Improper techniques can introduce residual stresses or surface defects, which may compromise structural integrity. Therefore, selecting appropriate cutting parameters ensures that marine steel components meet strict safety and performance standards.