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. Classified by production method: (1) Hot rolled steel plate (2) Cold rolled steel plate

3. Classification by surface characteristics: (1) Galvanized sheet (hot-dip galvanized sheet, electro-galvanized sheet) (2) Tin-plated 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 coils Hot-rolled coils Structural steel plates Automotive steel plates Shipbuilding steel plates Bridge steel plates Boiler steel plates Container steel plates Corrosion-resistant plates Replace cold with heat Baosteel’s wide and heavy plates Fire-resistant and weathering steel

3. Cold rolling:

Hard rolled coilsCold-rolled coilsElectrogalvanized sheets GB tin-plated WISCO silicon steel use

4. Boiling steel plate and killed steel plate:

1. Boiling steel plate is a steel plate hot-rolled from 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 molten steel. The oxygen content of molten steel is relatively high. When molten steel is injected into the ingot mold, carbon and oxygen react to produce a large amount of gas, causing the molten steel to boil. , The boiling steel got its name from this. The rimmed steel has low carbon content, and because it does not use ferrosilicon for deoxidation, the silicon content in the steel is also low (Si<0.07%). The outer layer of boiling steel is crystallized under the conditions of violent agitation of molten steel caused by boiling, so the surface layer is pure and dense, with good surface quality, good plasticity and stamping properties, no large concentrated shrinkage holes, and cutting head The production rate of rimmed steel is simple, the consumption of ferroalloy is small, and the cost of steel is low. Boiling steel plates are widely used in the manufacture of various stamping parts, construction and engineering structures and some less important machine structural parts. However, there are many impurities in the core of boiling steel, the segregation is serious, the structure is not dense, and the mechanical properties are uneven. At the same time, due to the high gas content in steel, the toughness is low, the cold brittleness and aging sensitivity are relatively large, and the welding performance is also poor. Therefore, boiling steel plates are not suitable for manufacturing welded structures and other important structures that bear 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 (usually 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 compact; due to the low oxygen content, the steel contains less oxide inclusions, high purity, low cold brittleness and aging tendency; at the same time, the segregation of the killed steel is small, The performance is relatively uniform and the quality is high. The disadvantages of killed steel are concentrated shrinkage, 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 high strength.

Low-alloy steel plates are both killed 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, its application has become more and more extensive.

5. High-quality carbon structural steel plate:

High-quality carbon structural steel is a 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 different carbon content: low-carbon steel (C≤0.25%), medium-carbon steel (C is 0.25-0.6%) and high-carbon steel (C>0.6%).

According to different manganese content, high-quality carbon structural steel can be divided into two groups: normal manganese content (manganese content 0.25%-0.8%) and higher manganese content (manganese content 0.70%-1.20%). The latter has better mechanics. Performance and processing performance.

1. High-quality carbon structural steel hot-rolled sheet and steel strip High-quality carbon structural steel hot-rolled thin steel sheet and steel strip are used in the automobile, aviation industry and other sectors. Its steel grades are rimmed steel: 08F, 10F, 15F; killed steel: 08, 08AL, 10, 15, 20, 25, 30, 35, 40, 45, 50. Low carbon steel plates below 25 and 25, 30 and Above 30 is medium carbon steel plate.

2. High-quality carbon structural steel hot-rolled thick steel plates and wide steel strips High-quality carbon structural steel hot-rolled thick steel plates and wide steel strips are used in various mechanical structural parts. Its steel grades are low carbon steels including: 05F, 08F, 08, 10F, 10, 15F, 15, 20F, 20, 25, 20Mn, 25Mn, etc.; medium carbon steels include: 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 plate for pressure vessel: Use capital R to indicate at the end of the grade. The grade can be expressed by yield point or 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 alloying elements.

2. Steel plate for welding gas cylinders: Use capital HP to indicate at the end of the grade, and its grade can be expressed by yield point, such as: Q295HP, Q345HP; it can also be expressed with alloying elements, such as: 16MnREHP.

3. Steel plate for boiler: Use lowercase g to indicate at the end of the brand name. 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 plate for automobile beam: Use capital L to indicate at the end of the grade, such as 09MnREL, 06TiL, 08TiL, 10TiL, 09SiVL, 16MnL, 16MnREL, etc.