Challenge of shipbuilding steel during usage

Ships are exposing in harsh environment, they are usually face waves, sunlight, seawater and winds and so on. Accordingly, shipbuilding steel should have the ability to resistant the harsh environment.

Corrosion and Rust
Ships are frequently exposed to seawater, leading to corrosion and rusting of steel, particularly at the hull bottom and above the waterline.

Fatigue and Stress
Ships experience complex mechanical stresses during navigation and wave impacts, such as the impact of wind, waves, seawater, and debris, these may cause fatigue cracking and deformation of steel.

Chemical Effects of Seawater
Salt content, microorganisms, and chemicals in seawater corrode steel, accelerating aging and damage.

Cold Temperature Effects
Steel used in polar and cold sea regions must withstand stresses and deformations at low temperatures.

Balance of Weight and Strength
Ship design requires balancing the weight and strength of steel to ensure adequate structural integrity while maintaining buoyancy and maneuverability.

To address these challenges, ship steels undergo special alloy designs and processing to enhance corrosion resistance, fatigue resistance, and mechanical properties. Additionally, various measures are taken during ship design and maintenance to prolong steel life and ensure safety.

Common shipbuilding steel grades
ASTM A131 Grade A, B, D, E
ABS Grade A, B, AH32, DH32, EH32, AH36, DH36, EH36
DNV Grade A, B, D, AH32, DH32, EH32, AH36, DH36, EH36
CCS Grade A, B, AH32, DH32, EH32, AH36, DH36, EH36
 

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