Cold-rolled enamelled steel for deep-drawing liner and manufacturing method thereof

Abstract

The invention discloses a cold-rolled enamel steel for deep-drawing liner, which contains the following chemical elements in mass percentages: C: 0.02-0.06%, 0<Si≤0.08%, Mn: 0.1-0.7%, P≤ 0.055%, S≤0.03%, Al: 0.01‑0.07%, N: 0.002‑0.010%, B: 0.002‑0.009%, Ti: 0.002‑0.015%, Nb: 0.002‑0.012%, Cr: 0.01‑0.08%, And at least one of Cu, Ni and Mo, wherein Cu+Ni+Mo≤0.40%. In addition, the invention also discloses a manufacturing method of cold-rolled enamel steel for deep-drawing liner, which includes the steps: (1) smelting, refining and continuous casting (2) slab heating (3) hot rolling and coiling (4) ) Pickling (5) Cold rolling: Control the cold rolling reduction rate to 60-70% (6) Continuous annealing: Soaking temperature is 800-830°C, soaking time is 100-150s, and over-aging temperature is 350-450 ℃, the over-aging time is 250‑350s(7). The cold-rolled enamel steel for deep-drawing liner of the present invention adopts reasonable chemical composition and process design, and has good formability, high strength after high-temperature enameling, excellent welding performance and excellent scale explosion resistance.

Description

Technical field [0001] The present invention relates to a metal material and a manufacturing method thereof, in particular to an enameled steel and a manufacturing method thereof. Background technique [0002] Enamel liner is divided into two-stage and three-stage structures. The main difference lies in the forming and welding process. The two-section liner is made of two wafers that are welded after deep drawing. The entire liner has only one annular weld, while the three-section liner is welded by two end caps and a barrel body, and the end cap is stamped. The process and barrel body adopt the rolling process, and there are two annular welds and one straight seam on the entire liner. [0003] In recent years, as industrial production considers improving product quality and reducing overall costs, the two-stage enamel inner tank has developed rapidly. During the forming process, the two-stage liner is formed with a high degree of processing through deep drawing and thinni...

AI Technical Summary

Problems solved by technology

However, it should be noted that although such a design can simultaneously improve the deep drawing performance and scale explosion resistance of the steel plate, the yield strength of the substrate is relatively low, and the yield strength will further decrease after high-temperature sintering, which cannot meet the pressure bearing requirements of the enamel liner. Requirements, and a large number of alloying elements are added in the design, the manufacturing cost is higher

[0007] At present, there are few targeted steel plates for two-stage enamel inner tanks in China. The steel for two-stage enamel inner tanks used by manufacturers of electric water heaters in my country is mainly made of ordinary cold steel SPCC. Carbon, manganese and other elements are fine-tuned, and alloying elements such as titanium, niobium and boron are not added, so there are certain problems in ensuring the quality of enamelling and welding

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