Gapless atom cold-rolled hot-galvanized steel plate and production method thereof

Abstract

The invention relates to a gapless atom cold-rolled hot galvanized steel plate and a production method thereof, which belongs to the technical field of iron-base alloys and solves the technical problem that the product performance can not reach the standard when a horizontal continuous annealing furnace is adopted for annealing to produce the gapless atom hot-galvanized steel plate in the prior art. The technical scheme is as follows: the gapless atom cold-rolled hot galvanized steel plate comprises the following chemical components in percentage by weight: 0.0005%-0.0028% of C, at most 0.03% of Si, 0.08%-0.20% of Mn, 0.02%-0.065% of Ti, at most 0.0030% of N, at most 0.015% of P, at most 0.010% of S, and the balance of Fe and inevitable impurity elements. The microscopic structure grain fineness of the cold-rolled steel plate is Grade I6.5-I8.0, the yield strength is 165-200 MPa, the tensile strength is 270-330 MPa, the percentage elongation after fracture A80mm is 38-44%, and the plastic strain ratio r is greater than or equal to 1.9. The method lowers the production cost of the gapless atom cold-rolled hot-galvanized steel plate. The product is mainly used for home appliance products, hardware structures and the like.

Description

technical field [0001] The invention relates to a cold-rolled hot-dip galvanized steel sheet without interstitial atoms and a production method thereof, 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 it has no interstitial atoms, it has excellent deep drawing performance and non-aging performance, especially hot-dip galvanized steel sheets without interstitial atoms, which have more excellent stamping performance after cold rolling and annealing above the recrystallization temperature. There are two existing technologies for producing hot-dip galvanized IF steel products, one is to go through the bell annealing process and then go through hot-dip after cleaning, and the other is to go through the continuous annealing process and then directly hot-dip. Compared with the bell-type annealing process, direct hot-dip galvanizing after continuous anne...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of interstitial-free cold-rolled hot-dip galvanized steel sheet and its production method, which mainly solves the problem that the performance of the product existing in the production of interstitial-free hot-dip galvanized steel sheet by annealing in a horizontal continuous annealing furnace in the prior art cannot be reached. to the requested technical questions

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