Hull structural steel is divided into general thickness and high-strength steel. General strength steel is divided into four grades of A, B, C and D; high-strength steel is divided into two strength grades and three quality grades; AH32, DH32, EH32, AH36, DH36, NV D40 hull steel material, EH36. In order to ensure quality and ensure sufficient toughness of hull structural steel, the chemical composition of Mn / C is required to be above 2.5, and the carbon equivalent is also strictly required. Our Hull structural steel plates can be supplied with certificates from different classification societies.
The weight of seamless steel pipe is only 1 / 5 of that of square steel. Seamless steel pipe corrosion resistance acid, alkali, salt and atmospheric environment corrosion, high temperature resistance, good impact and fatigue resistance, do not need regular maintenance. The effective service life of product NV D40 hull steel material more than 15 years.
Sulfur is a very harmful element in NV D40 hull steel material steel. The presence of sulfur will increase the hot brittleness of steel, reduce the various mechanical properties of NV D40 hull steel material steel, and reduce the weldability, impact toughness, fatigue resistance and corrosion resistance of steel.
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