What Is Deep drawing steel
Deep drawing steel is a cold-rolled steel sheet specially used for deep drawing processing. It has excellent plasticity, strength and ductility, and can withstand large deformation without cracking. Deep drawing steel is widely used in many fields such as automobiles, home appliances, aerospace, etc., and is one of the important industrial materials.
1. Steelmaking
Raw material preparation
Raw materials such as iron ore, coke and limestone are proportioned and pre-treated to ensure the quality and purity of the raw materials.
Blast furnace smelting
The prepared raw materials are put into the blast furnace and smelted at high temperature to reduce the iron in the iron ore into pig iron.
Converter refining
Pig iron is refined in a converter or electric furnace to remove impurities, and alloy elements are added according to different needs to obtain molten steel.
2. Continuous casting
Molten steel pouring
Molten steel is poured into a crystallizer, cooled and solidified to obtain a steel billet.
Cutting to length
The steel billet is cut into the required length and surface treated.
3. Hot rolling
Heating
The steel billet is heated to a certain temperature, usually between 1100-1250℃, to improve the plasticity of the steel billet.
Rolling
The heated steel billet is rolled in a rolling mill to gradually reduce the thickness of the steel billet and increase the width to obtain a hot-rolled steel plate.
Cooling
Cool the hot-rolled steel plate to control the structure and properties of the steel plate.
4. Cold rolling
Pickling
Pickle the hot-rolled steel plate to remove the oxide scale and impurities on the surface.
Annealing
Anneal the pickled steel plate to improve the structure and properties of the steel plate and improve its plasticity and ductility.
Cold rolling
Roll the annealed steel plate in a cold rolling mill to further reduce the thickness of the steel plate and improve the surface finish to obtain a cold-rolled steel plate.
5. Surface treatment
Galvanizing
A layer of zinc is plated on the cold-rolled steel plate to improve its corrosion resistance.
Aluminum plating
A layer of aluminum is plated on the cold-rolled steel plate to improve its corrosion resistance and aesthetics.
Painting
A layer of paint is applied to the cold-rolled steel plate to improve its corrosion resistance and aesthetics.
6. Finished product inspection
Appearance inspection
Check whether the surface of the steel plate has defects, such as scratches, pitting, inclusions, etc.
Dimension measurement
Measure the thickness, width, length and other dimensions of the steel plate to ensure that they meet the relevant standards.
Mechanical properties test
Test the tensile strength, yield strength, elongation and other mechanical properties of the steel plate to ensure compliance with relevant standards.
Chemical composition analysis
Analyze the chemical composition of the steel plate to ensure compliance with relevant standards.
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