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Steel plate and steel strips have become essential components of modern industry. They are widely used in automobile manufacturing, shipbuilding, aerospace, railway locomotive, architectural engineering, container production, machinery manufacturing and other fields.
Steel plates are divided into cold rolled, hot rolled and galvanized steel plates according to the manufacturing process, and they also can be divided into carbon structural steel, bridge structural steel, low alloy structural steel, high-strength steel, and special steel plates according to the purpose. Steel plates are usually flat and thin, and the thickness is usually above 4.5mm. Common specifications are 0.1-200mm in thickness and 600-2000mm in width. The most widely used steel plates are hot-rolled strip coils, and the production process mainly includes: continuous pickling - continuous rolling - hot-galvanized steel plate.
Steel strips are divided into cold-rolled strips, hot-rolled strips, galvanized strips and pre-coated strips according to the manufacturing process. Steel strips are solid steel products with different thickness and width, whose thin thickness is 0.3mm-3.5mm; sometimes thin steel plates can also be called strips. Common specifications are 0.3-3.5mm in thickness and below 600mm in width. Steel strips are usually divided into non-oriented and oriented silicon steel strips. Non-oriented silicon steel strips are mainly used in transformers, while oriented silicon steel strips are mainly used in transformer cores, motors, electric vehicles and other fields.
High-strength steel plates are a kind of special steel plates with high strength and special properties. It has high mechanical properties and good toughness and is suitable for structural parts with large sections due to its high strength. Common high strength structural steel plate production process includes pickling, normalizing (tempering), quenching, tempering, low temperature quenching, etc Sealing of high-strength steel plate parts must be paid attention to during welding to avoid quenching hardening of the weld.
Weathering steel is also called anti-corrosion steel. It is divided into low-alloy weather-resistant steel and high-alloy weather-resistant steel according to its chemical composition. The alloy elements added to high-alloy weather-resistant steel carbon steel can form a stable protective film on the surface of the steel under atmospheric conditions, so that the weatherproof steel can produce a corrosion-resistant effect and protect the steel from further corrosion.
Galvanized steel is a kind of steel surface treatment technology. The galvanized layer is composed of a zinc-iron alloy, which is generally composed of zinc and a small amount of aluminum, magnesium and silicon. The usual methods for galvanizing steel are hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing is to immerse the steel in the molten zinc bath and allow the molten zinc to react and bond with the steel sheet. Electro-galvanizing is to use electric current to electrolyze the zinc solution and deposit on the surface of the steel.
The above are common steels and steel plates. In actual production, the plates and strips used for different purposes also have different technical requirements, such as tensile strength, surface quality, dimensional tolerances and mechanical properties. In general, cold-rolled steel and hot-rolled steel have different advantages. When choosing, you should consider whether the purpose is in line with your needs, and then choose the right one according to the actual situation.
