Thick steel plate is a general term for steel plates with a thickness of more than 4mm. In actual work, steel plates with a thickness of less than 20mm are often referred to as medium plates, and the thickness is greater than 20mm to
Steel plates with a thickness of 60mm are called thick plates, and steel plates with a thickness greater than 60mm need to be rolled on a special extra-thick plate rolling mill, so they are called extra-thick plates. The width of the thick steel plate is from
0.6mm-3.0mm. Thick plates are divided into shipbuilding steel plates, bridge steel plates, boiler steel plates, high-pressure vessel steel plates, pattern steel plates, automobile steel plates, armored steel plates and composite steel plates according to their purposes.
What are the classifications of medium and thick steel plates?
(1) Ordinary medium and thick steel plates
Ordinary carbon steel rimmed steel plate, as the name implies, is a steel plate made by hot rolling of rimmed steel of ordinary carbon structural steel. Boiling steel is a kind of steel with incomplete deoxidation. The molten steel has a high oxygen content. When the molten steel is injected into the steel ingot mold, carbon and oxygen react to produce a large amount of gas, which causes the molten steel to boil.
Boiling steel has low carbon content, and because it does not use ferrosilicon for deoxidation, the silicon content in steel is often less than 0.07%. The outer layer of boiling steel is crystallized in the boiling state, so the surface layer is pure and dense, the surface quality is good, and the processing performance is good. Boiling steel does not have large concentrated shrinkage cavities, uses less deoxidizer, and has low steel cost. The core of boiling steel has many impurities, serious segregation, uneven mechanical properties, high gas content in steel, low toughness, cold brittleness and aging sensitivity, and poor welding performance, so it is not suitable for manufacturing to withstand impact load. Welded structural parts and other important structural parts that work at low temperatures.
(1) Main purpose
Boiling steel plates are widely used to manufacture various stamping parts, construction and engineering structures, and some less important machine structures and parts.
Medium and heavy steel plates include:
1. Ordinary carbon steel boiling steel plate
Ordinary carbon steel rimmed steel plate, as the name implies, is a steel plate made by hot rolling of rimmed steel of ordinary carbon structural steel. Boiling steel is a kind of steel with incomplete deoxidation. The molten steel has a high oxygen content. When the molten steel is injected into the steel ingot mold, carbon and oxygen react to produce a large amount of gas, which causes the molten steel to boil.
Boiling steel has low carbon content, and because it does not use ferrosilicon for deoxidation, the silicon content in steel is often less than 0.07%. The outer layer of boiling steel is crystallized in the boiling state, so the surface layer is pure and dense, the surface quality is good, and the processing performance is good. Boiling steel does not have large concentrated shrinkage cavities, uses less deoxidizer, and has low steel cost. The core of boiling steel has many impurities, serious segregation, uneven mechanical properties, high gas content in steel, low toughness, cold brittleness and aging sensitivity, and poor welding performance, so it is not suitable for manufacturing to withstand impact load. Welded structural parts and other important structural parts that work at low temperatures.
(1) Main purpose
Boiling steel plates are widely used to manufacture various stamping parts, construction and engineering structures, and some less important machine structures and parts.
2. Plain carbon steel killed steel plate
Common carbon-killed steel plate is a steel plate made by hot-rolling ordinary carbon structural steel killed billet. Killed steel is completely deoxidized steel. The molten steel is fully deoxidized with ferromanganese, ferrosilicon and aluminum before ingot injection. The molten steel is relatively calm in the ingot mold and does not produce a boiling state, so it is called killed steel.
The advantage of killed steel is that the chemical composition is uniform, so the mechanical properties of each part are also uniform, the welding performance and plasticity are good, and the corrosion resistance is strong. However, the surface quality is poor, there are concentrated shrinkage holes, and the cost is also high.
(1) Main purpose
Ordinary killed steel plates are mainly used to produce components that withstand impact at low temperatures, welded structures and other structural parts that require higher strength.
3. Low alloy structural steel plate
The low-alloy structural steel plate is made of hot-rolled low-alloy structural steel. Low-alloy steel plates are both killed and semi-killed steel plates. Its advantages are higher strength, better performance, saving a lot of steel, reducing structural weight and so on.
(1) Main purpose
Low-alloy structural steel plates are more and more widely used in machinery manufacturing and metal structural parts.
4. Hot continuous rolled steel plate for general structure
1) Main purpose: Mainly used for general structures such as buildings, bridges, vehicles, etc.
5. Weather-resistant steel plate for welding structure Weather-resistant steel is atmospheric corrosion-resistant steel. Weathering steel for welding structure is a small amount of alloying elements added to the steel, such as steel, chromium, nickel, molybdenum, niobium, titanium,
Zirconium and vanadium, etc., make it form a protective layer on the surface of the metal substrate to improve the weather resistance of steel and good welding performance.
(1) The main purpose is mainly used for bridges, buildings and other structures.
6. High weather resistance structural steel plate
Weathering steel is resistant to atmospheric corrosion. A small amount of alloying elements such as steel, phosphorus, chromium, nickel, molybdenum niobium, titanium, zirconium and vanadium are added to the steel to form a protective layer on the surface of the metal matrix to improve the weather resistance of the steel.
(1) Main purpose: Mainly applicable to buildings, vehicles, towers and other structural parts.
7. Checkered steel plate: Checkered steel plate is a steel plate with diamond-shaped or lentil-shaped ribs on its surface. Its specifications are expressed by its own thickness (not counting the thickness of the ribs).
(1) Main purpose: Checkered plate has anti-slip effect, and is often used as floor, factory escalator, work frame pedal, ship deck and automobile bottom plate, etc.