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

AI Technical Summary

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 annealing needs to have a higher temperature capability, thereby increasing the construction and maintenance costs and energy consumption of the annealing furnace; The difficulty of tension, leveling and stable operation control increases, and it is easy to cause product defects such as ribbing and rib printing, and even cause production accidents such as broken belts

Images