Marine steel
Marine steel means steel used in the manufacture of hull structures for sea and inland vessels. High-quality carbon steel and high-quality low alloy steel are usually used. Marine steel requires certain strength, toughness and certain low temperature and corrosion resistance. And requires better welding performance.
Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion, electrochemical corrosion and corrosion of marine organisms and microorganisms. The hull is subjected to large wind and wave impacts and alternating loads. The shape of the ship makes the processing method complicated and so on, so the steel for the hull structure is strictly required. First, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, processability and surface quality are required. In addition, high strength, good corrosion resistance, weldability, processability and surface quality are required. There are also strict requirements on carbon equivalents and are produced by steel mills approved by the ship inspection department. The hull structural steel is divided into strength grades according to its minimum yield point, which are general strength structural steel and high strength structural steel. General strength steel is divided into four grades according to quality: A, B, D and E. High-strength steel is divided into two strength grades and three quality grades; AH32, DH32, EH32, AH36, DH36, EH36. Marine steel plates are produced following the requirements of the construction society of the classification society. Hot rolled steel sheet for the manufacture of hull structures. The general strength structural steel of China Classification Society standard is divided into four quality grades: A, B, C and D (ie CCSA, CCSB, CCSC, CCSD); the high-strength structural steel of China Classification Society standard is three Strength level, four quality levels.
Due to the particularity and complexity of the working conditions of the ship.
Therefore, high requirements are imposed on the metal material for manufacturing the hull structure. It generally includes good mechanical properties, excellent process performance, good corrosion resistance, economical price and good experimental performance.
Good mechanical properties include strength, plasticity, impact toughness, fatigue strength and hardness. The so-called processability refers to the adaptability of materials to various processing methods. Therefore, the hull structural material must have good weldability and excellent bending resistance. From the aspect of corrosion resistance, austenitic stainless steel and duplex stainless steel are ideal as shipbuilding materials.
Metal materials used in hull structures have only undergone rigorous and comprehensive performance tests. In order to ensure the quality of the ship and the safety of navigation. The test items include tensile test, impact test, cold bend test, welding approval test, and chemical composition test.
In recent years, high-performance steel has been greatly developed in the practical application of shipbuilding engineering. Great progress has been made in the strength, corrosion resistance, weldability, toughness and fatigue resistance of steel. It has a wide range of applications in the field of high-tech ships and marine engineering.
Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion, electrochemical corrosion and corrosion of marine organisms and microorganisms. The hull is subjected to large wind and wave impacts and alternating loads. The shape of the ship makes the processing method complicated and so on, so the steel for the hull structure is strictly required. First, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, processability and surface quality are required. In addition, high strength, good corrosion resistance, weldability, processability and surface quality are required. There are also strict requirements on carbon equivalents and are produced by steel mills approved by the ship inspection department. The hull structural steel is divided into strength grades according to its minimum yield point, which are general strength structural steel and high strength structural steel. General strength steel is divided into four grades according to quality: A, B, D and E. High-strength steel is divided into two strength grades and three quality grades; AH32, DH32, EH32, AH36, DH36, EH36. Marine steel plates are produced following the requirements of the construction society of the classification society. Hot rolled steel sheet for the manufacture of hull structures. The general strength structural steel of China Classification Society standard is divided into four quality grades: A, B, C and D (ie CCSA, CCSB, CCSC, CCSD); the high-strength structural steel of China Classification Society standard is three Strength level, four quality levels.
Therefore, high requirements are imposed on the metal material for manufacturing the hull structure. It generally includes good mechanical properties, excellent process performance, good corrosion resistance, economical price and good experimental performance.
Good mechanical properties include strength, plasticity, impact toughness, fatigue strength and hardness. The so-called processability refers to the adaptability of materials to various processing methods. Therefore, the hull structural material must have good weldability and excellent bending resistance. From the aspect of corrosion resistance, austenitic stainless steel and duplex stainless steel are ideal as shipbuilding materials.
Metal materials used in hull structures have only undergone rigorous and comprehensive performance tests. In order to ensure the quality of the ship and the safety of navigation. The test items include tensile test, impact test, cold bend test, welding approval test, and chemical composition test.
In recent years, high-performance steel has been greatly developed in the practical application of shipbuilding engineering. Great progress has been made in the strength, corrosion resistance, weldability, toughness and fatigue resistance of steel. It has a wide range of applications in the field of high-tech ships and marine engineering.
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