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The whole submarine is a large welding structure, and welding is an essential process for submarine construction. Considering the safety of submarine structure, it is a very strict requirement that the weld, heat affected zone and base metal should have equal strength and toughness. Because the welding process is the process of remelting and re solidification of metal, it is completely different from the base metal through refining, rolling, heat treatment, etc. The welding seam obtains a coarse casting structure, while the base metal is a quenched and tempered structure with good comprehensive properties. With the increase of steel strength, the carbon equivalent also increases, and the weldability of steel will become worse. Submarine steel must have good weldability to meet the technical requirements of submarine construction and use.
The weldability of submarine steel is usually expressed by carbon equivalent (Ceq) and crack sensitivity coefficient (PcM). Carbon equivalent Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14, crack sensitivity coefficient PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B. It is required that carbon equivalent and welding crack sensitivity coefficient of submarine steel should be reduced as much as possible.
GB T 5312 Carbon and carbon-manganese steel seamless steel tubes and pipes are mainly for ship use, also known as shipbuilding steel pipes. Under GB T 5312, there are mainly 5 steel grades: grade 320, 360, 410, 460 and 490. Each grade covers three levels: I, II, III.
Angle steel, commonly known as angle iron, is a long strip of steel whose sides are perpendicular to each other. There are equal angle steels and unequal angle steels. The two sides of equal angle steel are equal in width. The unequal angle steel is also known as L shape profile steel.
Flat bar steel can be produced according to the user's needs, with fixed thickness, width and length. It can reduce the cutting process for users, reduce the consumption of labor and materials, and also reduce the processing loss of raw materials.
Bulb flat steel for shipbuilding
The bulb flat steel is a kind of medium section material which is mainly used in the field of shipbuilding and bridge building, and the shipbuilding bulb flat steel is an auxiliary medium section material for shipbuilding.
The steel for shipbuilding and oil platform---FH40, is the high tensile strength steel.The shipbuilding steel FH40 is the Hull structural steel.We can provide FH40 shipbuilding steel plate price.
The steel for shipbuilding and oil platform---EH40, is the high tensile strength steel.The shipbuilding steel EH40 is the Hull structural steel.We can provide EH40 shipbuilding steel plate price.
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