Annealing process for eliminating banded structure of 25 steel cold-rolled sheet
A technology of band structure and annealing process, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of shortening the service life of products, cracking, etc., and achieve the effect of uniform metallographic structure and good annealing quality
Inactive Publication Date: 2021-08-17
XINJIANG BAYI IRON & STEEL
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Problems solved by technology
Therefore, steel products with banded structure tend to crack along the junction of ferrite band and pearlite band during service, which seriously shortens the service life of the product
Method used
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Experimental program
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Embodiment Construction
[0009] An annealing process for eliminating the banded structure of 25 steel cold-rolled sheets. Place 25 steel cold-rolled coils in a bell furnace, set up a heating mantle, fill the inner mantle with nitrogen for purging, then feed in nitrogen and hydrogen and start heating. Anneal at 630-670°C for 9-11 hours under the protective atmosphere of nitrogen and hydrogen. The ordinary cold-rolled coil is cooled to 600°C with the furnace under the protection of nitrogen and hydrogen. Stop the air cooling and lift it away for heating. Cover, ordinary cold-rolled coils are naturally cooled from 600°C to 105°C, and then released from the furnace.
[0010] The invention is suitable for the iron and steel production enterprises which have the tooling equipment of cold rolling pickling-cold rolling mill-cold rolling bell furnace annealing-levelling-heavy coil packaging.
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The invention discloses an annealing process for eliminating a banded structure of a 25 steel cold-rolled sheet. The process comprises the following steps: heating a 25 steel cold-rolled coil to an annealing process temperature under the protection of nitrogen and hydrogen in a bell-type furnace, and removing residual oil on the surface in the heating process; annealing the cold-rolled 25 steel product that is subjected to heat preservation for 9-11 hours at the high process temperature of 630-670 DEG C under the protection of nitrogen and hydrogen, so that sufficient recrystallization and alloy element distribution homogenization at the high temperature are kept, then cooling a steel coil along with a furnace at the high temperature under the condition that the steel coil is provided with a cover, wherein homogenization of alloy elements in a banded structure is further promoted. According to the invention, the coiled cold-rolled steel sheet is annealed, and the banded structure of the cold-rolled steel sheet is eliminated.
Description
technical field [0001] The invention relates to an annealing process for eliminating the strip structure of 25 steel cold-rolled plates. Background technique [0002] 25 steel belongs to high-quality medium and low carbon steel, 0.25% < ω[C] < 0.6%. The metal characteristics of medium and low carbon steel are different from medium carbon steel and high carbon steel because austenite exhibits strong thermoplasticity. Therefore, high-quality medium and low carbon steel is widely used in the manufacture of thin steel plates and steel strips, and is used in automobiles, aviation and other components. Medium and low carbon steel contains more cementite, and there are more mechanical mixtures of cementite and ferrite. The content of pearlite in steel is higher than that of low carbon steel, and the hardness and strength of steel parts are improved. The hardness after quenching will also increase significantly, which combines high hardness, high strength and high toughness. ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C21D1/26C21D1/74C21D9/00
CPCC21D1/26C21D1/74C21D9/0081
Inventor 胡洪林马孝娟卢鹏程
Owner XINJIANG BAYI IRON & STEEL