Niobium-containing alloying hot-galvanizing steel for automobile outer cover part and manufacturing method of steel

Abstract

The invention discloses niobium-containing alloying hot-galvanizing steel for an automobile outer cover part. The steel comprises the chemical components by weight percentage: smaller than or equal to 0.003 percent of C, smaller than or equal to 0.01 percent of Si, 0.06 percent to 0.15 percent of Mn, smaller than or equal to 0.015 percent of P, 0.01 percent to 0.04 percent of Nb, 0.02 percent to 0.05 percent of Ti, 0.015 percent to 0.04 percent of Als, smaller than or equal to 0.01 percent of S, smaller than or equal to 0.003 percent of N and the rest of Fe and unavoidable impurities. Besides, the invention also provides a corresponding manufacturing method. The produced steel for the outer cover part has low strength and very high deep drawability, meanwhile has a lower deltar value and better coating quality, and has good isotropy and excellent welding performance.

Description

technical field [0001] The invention relates to a steel material manufacturing technology, in particular to a niobium-containing alloyed hot-dip galvanized steel for an outer cover part of an automobile and a manufacturing method thereof. Background technique [0002] With the development of my country's automobile industry, especially the "blowout" development of my country's automobile market in recent years, new requirements have been put forward for the performance of automobile materials. As the material of automobile body panels, the formability of steel plates will directly determine the scrap rate of stamping processing and the life of stamping dies, and the performance of coatings also determines the corrosion resistance and service life of automobiles. Alloyed IF steel has become the main steel for automobile body panels due to its excellent processing and forming properties and anti-corrosion properties. It is widely used in various automobile manufacturers, espec...

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Problems solved by technology

In addition, the corrosion resistance of the outer covering of the car body is the main factor determining the service life of the car. The steel plate of the outer covering of the car should have the ability to resist atmospheric corrosion and salt spray corrosion. It cannot meet the requirements of corrosion resistance, so alloyed hot-dip galvanized IF steel with excellent corrosion resistance and good deep drawing performance is favored by automobile manufacturers

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