Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof

Abstract

The invention relates to a low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and a production method thereof and belongs to the technical field of iron-based alloys. The production method of the cold-rolled steel plate comprises the following steps of: controlling the components of the cold-rolled steel plate in percentage by mass: 0.0005-0.0025% of C, less than or equal to 0.03% of Si, 0.05-0.15% of Mn, less than or equal to 0.015% of P, less than or equal to 0.01% of S, less than or equal to 0.0025% of O, less than or equal to 0.0025% of N, 0.015-0.050% of Al, 0.03-0.07% of Ti, and the balance of Fe and inevitable mixed elements; and meanwhile, controlling the continuous-annealing temperature of the cold-rolled steel plate to be 710-740 DEG C, and controlling the cold-rolling reduction ratio to be not less than 80%. According to the cold-rolled steel plate and the production method thereof, the reasonable chemical components and the suitable control of cold-rolling reduction are adopted, the recrystallization temperature is lowered, full-old-rolled microstructures are formed, and a lower continuous-annealing temperature can be adapted, so that the equipment cost and energy consumption are reduced, the control difficulty of a production process is reduced, the product defects and production accidents are avoided.

Description

technical field [0001] The invention relates to a cold-rolled steel plate without interstitial atoms and a production method of the cold-rolled steel plate, belonging to the technical field of iron-based alloys. Background technique [0002] Interstitial-free steel is also called IF steel (short for Interstitial-Free Steel). Because there are no interstitial atoms, it has excellent deep drawing performance and non-aging performance, and has been widely used in automobiles, home appliances, hardware and other industries. In particular, interstitial-free cold-rolled steel sheets, after cold-rolling and annealing above the recrystallization temperature, can obtain a good micro-texture and have more excellent stamping performance. There are two annealing methods for interstitial-free cold-rolled steel sheets: bell annealing process and continuous annealing process. Compared with the bell annealing process, continuous annealing has 1) uniform mechanical properties in the length...

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Problems solved by technology

[0003] However, as far as the applicant knows, the recrystallization temperature of existing interstitial-free cold-rolled steel sheets is relatively high during continuous annealing, so a relatively high continuous annealing temperature (generally ≥ 780°C) is required

In this way, in actual production, on the one hand, the continuous annealing furnace for anneal

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