Hydrogen-rich circulating annealing process for cold-rolled oil drum plate

Abstract

The invention discloses a hydrogen-rich circulating annealing process for a cold-rolled oil drum plate, which is characterized in that a steel coil comprises the following chemical components: 0.04-0.08% of C, 0.02-0.03% of Si, 0.26-0.33% of Mn, less than 0.01% of P, less than 0.005% of S and the balance of Fe and residual elements, the oil drum plate cold-rolled steel coil subjected to hot rolling and cold rolling is placed on a furnace platform of a cover type annealing furnace, an inner cover is buckled firstly, then a heating cover is buckled, a medium pipeline is connected, nitrogen is used for purging air, hydrogen is used for purging nitrogen, and the steel coil is subjected to hot rolling and cold rolling; two heat preservation processes of 430 DEG C and 680 DEG C are adopted, heat preservation is conducted for 3 hours at the temperature of 430 DEG C, annealing and heat preservation are conducted for 7 hours at the temperature of 680 DEG C, recrystallization temperature annealing is conducted, hydrogen tail gas discharged in the annealing process is collected through a main pipeline, hydrogen with the hydrogen purity being 99.999%, the dew point being-65 DEG C or below and the oxygen content being 5 ppm or below is obtained, and hydrogen recycling is achieved. And the annealed steel coil is subjected to flattening treatment with the elongation of 1.1%, the surface of the steel coil is cleaned with flattening liquid with the concentration of 3%-5%, and the high-surface oil drum plate product is obtained.

Description

technical field [0001] The invention relates to a hydrogen-rich cycle annealing process for cold-rolled oil drum plates. Background technique [0002] The cold-rolling annealing furnace uses hydrogen as the protective atmosphere. Due to its good oxidation resistance, cold-rolled steel coils with no oxidation and high surface can be obtained by annealing and heating under the action of the protective atmosphere. At present, the hydrogen exhaust gas of the process is not recycled and recycled, and the consumption of hydrogen is relatively high. It consumes 2-2.3 cubic meters of hydrogen per ton of steel produced. The high-grade oil drum plate has very strict requirements on the surface quality of the cold-rolled steel plate due to the high purity and high value of the oil contained in it. [0003] In the state of the art: the hydrogen used once is discharged into the atmosphere with the exhaust gas after simple treatment, and is no longer recycled. The tail gas contains impu...

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Problems solved by technology

Significantly reduce the surface roughness of the strip steel

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