780MPa-grade cold-rolled high-strength electro-galvanized steel plate and manufacturing method thereof

Abstract

The invention discloses a 780MPa-grade cold-rolled high-strength electro-galvanized steel plate which comprises a base plate and a plating layer, and the base plate comprises the following chemical elements in percentage by mass besides Fe and inevitable impurity elements: 0.02-0.15% of C, less than or equal to 0.02% of Si, 0.2-1.9% of Mn, 0.01-0.1% of Al, more than 0 and less than or equal to 0.02% of Nb, and less than or equal to 0.01% of N; and at least one of < = 0.01% of Cu, < = 0.1% of Ni, < = 0.2% of Cr, < = 0.05% of Mo, < = 0.03% of V and < = 0.03% of Ti. In addition, the invention also discloses a manufacturing method of the 780MPa-grade cold-rolled high-strength electro-galvanized steel plate, which comprises the following steps: smelting and casting; hot rolling; pickling and cold rolling; continuous annealing is conducted, specifically, the annealing heat preservation temperature is 600-650 DEG C, and the heat preservation time is 60-150 s; after heat preservation is finished, cooling to the aging temperature of 250-400 DEG C at the speed of 10-30 DEG C / s; and electroplating zinc on the substrate. The 780MPa-grade cold-rolled high-strength electro-galvanized steel plate disclosed by the invention can meet the strict requirements of a sealing and gluing base plate on product performance, surface quality, thickness precision and plate shape.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a steel plate for a pressure vessel and a manufacturing method thereof. Background technique [0002] Sealing rubber gasket is a kind of sheet metal plate as the base material, and the surface of the metal plate is coated with rubber materials such as nitrile rubber and fluorine rubber in different thicknesses by advanced processing technology. [0003] The metal rubber-coated sheet not only has the characteristics of good micro-sealability of rubber, but also has the rigidity of metal. Its tensile strength is equivalent to that of metal, and it has good impact resistance. It can reduce noise and reduce noise during use. Sound insulation and noise reduction effect, reducing noise during friction. Sealing glue-coated boards have high requirements on the surface quality of their substrates, which require the substrates to have good glue-coating properties, clean ...

AI Technical Summary

Problems solved by technology

The alloy cost of this patent document is high, and the control process is complicated, and the final metallographic structure is a composite structure of granular bainite and martensite

[0010] Based on this, in order to solve the problems of high product cost caused by the need to add strengthening elements to improve product strength in the prior art, and unstable performance of multi-phase structure products, it is expected to obtain a new 780MPa grade cold-rolled high-strength electro-galvanized steel sheet and its manufacturing method, the 780MPa grade cold-rolled high-strength electro-galvanized steel sheet can not only meet the high strength and high hardness requirements of the sealing rubber substrate, but also meet the high shape and high thickness precision requirements of the sealing rubber substrate, and also meet the sealing requirements. The surface roughness requirements of the glue-coated substrate, its metallurgical cost and process cost are relatively low, which can create good economic and social benefits

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