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

Abstract

The invention discloses a cold-rolled enamel steel for deep-drawing inner tanks, which contains the following chemical elements in the following 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 method for manufacturing cold-rolled enamelled steel for deep-drawing inner tanks, which includes the steps of: (1) smelting, refining and continuous casting (2) slab heating (3) hot rolling and coiling (4) ) pickling (5) cold rolling: controlled cold rolling reduction rate 60-70% (6) continuous annealing: soaking temperature 800-830°C, soaking time 100-150s, overaging temperature 350-450 ℃, the overaging time is 250‑350s (7) flat. The cold-rolled enamelled 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 enamelling, excellent welding performance and excellent anti-scaling performance.

Description

technical field [0001] The invention relates to a metal material and a manufacturing method thereof, in particular to an enamelled steel and a manufacturing method thereof. Background technique [0002] The enamel liner is divided into two-stage and three-stage structures, the main difference lies in the forming and welding process. The two-stage inner tank is welded by two discs after deep drawing, and the whole inner tank has only one circular weld seam, while the three-stage inner tank is welded by two end covers and a barrel body, and the end cover is stamped Craftsmanship, the body of the barrel adopts the rolling process, and there are two circular welds and one straight seam on the entire inner tank. [0003] In recent years, with the consideration of improving product quality and reducing overall cost in industrial production, the two-stage enamel liner has developed rapidly. During the forming process of the two-stage liner, deep drawing, thinning and deep drawing...

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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