Classification of steel plates

1. Classification of Steel Plates (including strip steel):
1. Classification by thickness: (1) thin plate (2) medium plate (3) thick plate (4) extra thick plate
2. Classification by production method: (1) Hot-rolled Steel Plate (2) Cold-rolled steel plate
3. Classification according to surface characteristics: (1) galvanized sheet (hot-dip galvanized sheet, electro-galvanized sheet) (2) tinned sheet (3) composite Steel Sheet (4) color coated steel sheet
4. Classification by use: (1) Bridge steel plate (2) Boiler steel plate (3) Shipbuilding steel plate (4) Armor steel plate (5) Automobile steel plate (6) Roof steel plate (7) Structural steel plate (8) Electrical steel plate (silicon steel sheet) (9) Spring steel plate (10) Others
2. Hot rolling
Pickling coil Hot-rolled coil Structural steel plate Automobile steel plate Shipbuilding steel plate Bridge steel plate Boiler steel plate Container steel plate Corrosion-resistant plate Replacing cold with heat Baosteel wide and thick plate Fire-resistant and weather-resistant steel
3. Cold rolling
Hard-rolled coils, cold-rolled coils, electro-galvanized coils, hot-dip galvanized coils, galvanized coils, color-coated coils, tin-coated coils, Baosteel electrical steel composite steel plates, cold-rolled steel strips, aluminum-coated coils, GB hot-dip galvanized coils, galvanized coils, color-coated coils, and color cards GB tinned WISCO silicon steel
4. Boiling steel plate and calming steel plate
1. The boiling steel plate is a steel plate made of ordinary Carbon Structural Steel boiling steel. Boiling steel is a kind of steel with incomplete deoxidation. Only a certain amount of weak deoxidizer is used to deoxidize the molten steel. The oxygen content of the molten steel is relatively high. When the molten steel is injected into the ingot mold, a large amount of gas will be generated by the reaction of carbon and oxygen, causing the molten steel to boil. , The boiling steel got its name from this. Boiling steel has low carbon content, and since ferrosilicon is not used for deoxidation, the silicon content in steel is also low (Si<0.07%). The outer layer of boiling steel is crystallized under the condition of violent stirring of molten steel caused by boiling, so the surface layer is pure and dense, with good surface quality, good plasticity and stamping performance, no large concentrated shrinkage cavity, and cut head Less, the yield is high, and the production process of boiling steel is simple, the consumption of ferroalloy is less, and the cost of steel is low. Boiling steel plates are widely used in the manufacture of various stamping parts, architectural and engineering structures and some less important machine structural parts. However, there are many impurities in the core of the boiling steel, the segregation is serious, the structure is not dense, and the mechanical properties are not uniform. At the same time, due to the high gas content in the steel, the toughness is low, the sensitivity to cold brittleness and aging is large, and the welding performance is also poor. Therefore, the boiling steel plate is not suitable for manufacturing welded structures and other important structures that withstand impact loads and work under low temperature conditions.
2. Killed steel plate is a steel plate made of ordinary carbon structural steel killed steel by hot rolling. Killed steel is completely deoxidized steel. The molten steel is fully deoxidized with ferromanganese, ferrosilicon and aluminum before pouring. The oxygen content of the molten steel is low (generally 0.002-0.003%), and the molten steel is relatively calm in the ingot mold. There is no boiling phenomenon, hence the name of killed steel. Under normal operating conditions, there are no bubbles in the killed steel, and the structure is uniform and dense; due to the low oxygen content, the oxide inclusions in the steel are less, the purity is higher, and the tendency to cold brittleness and aging is small; at the same time, the killed steel has a small segregation, The performance is relatively uniform and the quality is high. The disadvantage of killed steel is that it has concentrated shrinkage cavity, low yield and high price. Therefore, killed steel is mainly used for components that withstand impact at low temperatures, welded structures and other components that require higher strength.
Low-alloy steel plates are all killed steel and semi-killed steel plates. Due to its high strength and superior performance, it can save a lot of steel and reduce the weight of the structure, and its application has become more and more extensive.
5. High-quality carbon structural steel plate
High-quality carbon structural steel is Carbon Steel with a carbon content of less than 0.8%. This steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has better mechanical properties.
High-quality carbon structural steel can be divided into three categories according to the carbon content: low carbon steel (C≤0.25%), medium carbon steel (C is 0.25-0.6%) and high carbon steel (C>0.6%).
High-quality carbon structural steel is divided into two groups with normal manganese content (0.25%-0.8% manganese content) and higher manganese content (0.70%-1.20% manganese content) according to the manganese content. The latter has better mechanical properties. properties and processability.
1. High-quality carbon structural steel hot-rolled thin steel plate and steel strip
High-quality carbon structural steel hot-rolled sheets and strips are used in the automotive, aerospace industries and other sectors. The grades of the steel are boiling steel: 08F, 10F, 15F; killed steel: 08, 08AL, 10, 15, 20, 25, 30, 35, 40, 45, 50. 25 and below are low Carbon Steel Plates, 30 and below Above 30 is a medium Carbon Steel Plate.
2. High-quality carbon structural steel hot-rolled thick steel plate and wide steel strip
High-quality carbon structural steel hot-rolled thick steel plates and wide steel strips are used for various mechanical structural parts. The steel grades are low carbon steel including: 05F, 08F, 08, 10F, 10, 15F, 15, 20F, 20, 25, 20Mn, 25Mn, etc.; medium carbon steel includes: 30, 35, 40, 45, 50, 55, 60, 30Mn, 40Mn, 50Mn, 60Mn, etc.; high carbon steel includes: 65, 70, 65Mn, etc.
6. Special structural steel plate
1. Steel plates for pressure vessels: use a capital R at the end of the grade to indicate that the grade can be expressed by the yield point or by the carbon content or alloying elements. Such as: Q345R, Q345 is the yield point. Another example: 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR, etc. are all represented by carbon content or alloy elements.
2. Steel plates for welding gas cylinders: use uppercase HP at the end of the grade to indicate, and the grade can be expressed by yield point, such as: Q295HP, Q345HP; it can also be expressed with alloy elements such as: 16MnREHP.
3. Boiler steel plate: use a lowercase g to indicate at the end of the grade. Its grade can be expressed by yield point, such as: Q390g; it can also be expressed by carbon content or alloying elements, such as 20g, 22Mng, 15CrMog, 16Mng, 19Mng, 13MnNiCrMoNbg, 12Cr1MoVg, etc.
4. Steel plates for bridges: use lowercase q to indicate at the end of the grade, such as Q420q, 16Mnq, 14MnNbq, etc.
5. Steel plates for automobile beams: use capital L at the end of the grade to indicate, such as 09MnREL, 06TiL, 08TiL, 10TiL, 09SiVL, 16MnL, 16MnREL, etc.