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The main factors affecting the properties of marine engineering steel are chemical composition, melting and casting, rolling and heat treatment process, among which sulfur and phosphorus content directly affect the properties of marine engineering steel plate thickness direction. Sulphur is the most serious segregation element in continuous casting slab. Sulphur can cause hot brittleness of marine engineering steel and cracks in marine engineering steel during forging at high temperature. There are many looseness and blowhole during welding.
Phosphorus is a high segregation element next to sulphur in continuous casting billet of marine engineering steel, and the diffusion rate of phosphorus in iron solid solution is very small, so the segregation of phosphorus is difficult to eliminate, which seriously affects the properties of marine engineering steel. Phosphorus is dissolved in ferrite in the form of solid solution, which is very brittle. The formed phosphorus-rich zone promotes the brittleness of marine engineering steel and reduces its plasticity, toughness and weldability. It is easy to cause cracks in marine engineering steel during hot working and cracks in welding. Phosphorus is an element that reduces the surface tension of marine engineering steel. With the increase of phosphorus content, the surface tension of molten marine engineering steel decreases significantly, which reduces the crack resistance of marine engineering steel.
Therefore, there are strict requirements for sulfur and phosphorus content in marine engineering steel plates for offshore platforms, among which the sulfur content is strictly controlled.
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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