High strength enamel steel and producing technology and enamel firing technology thereof

Abstract

The invention discloses a high strength enamel steel in which the chemical compositions are as follows according to weight percentages: C is 0.01 to 0.12; Si is less than or equal to 0.03, Mn is 0.50 to 1.00, P is less than or equal to 0.070, S is less than or equal to 0.015, Nb is 0.020 to 0.050, Mo is 0.05 to 0.30, Als is 0.005 to 0.070, and the remainder is Fe and unavoidable impurities; simultaneously, the steel further meets that 10Nb is greater than or equal to Mo and 10Nb+Mo is greater than or equal to 0.30 and is less than or equal to 0.50. The steel yield strength is greater than or equal to 360 MPa. The production and enamel firing technology of the steel in turn comprises melted iron desulfurization, combined converting at converting top and bottom, argon blowing treatment, protective casting into plate blank, controlled rolling controlled cold rolling into hot rolled plate, acid cleaning, sand blasting, enamelling and high temperature enamel firing, having simple production working procedures, low production cost, multiple enamelling methods, good enamel adhesiveness and high-temperature resistant enamel firing.

Description

technical field [0001] The invention relates to the manufacturing technology of micro-alloyed hot-rolled steel plates and steel strips, in particular to a high-strength enamel steel and its production and enamelling process. Background technique [0002] Steel for enameling has a wide range of uses. In order to ensure its cold formability and enamel performance, the early steel for enamel usually contained less than 0.01% carbon (C) and contained almost no carbon. In its production process, expensive microalloying elements need to be added, and decarburization annealing treatment is required after hot rolling and cold rolling. Many, long production cycle, high production cost, and due to the need for annealing heat treatment, the surface quality of the steel plate is poor, and it is easy to foam and black spots and other defects in the subsequent enamelling process. [0003] In order to obtain better performance steel for enamelling, before the application of the present i...

AI Technical Summary

Problems solved by technology

In its production process, expensive microalloying elements need to be added, and decarburization annealing treatment is required after hot rolling and cold rolling. Many, long production cycle, high production cost, and due to the need for annealing heat treatment, the surface quality of the steel plate is poor, and it is easy to foam and black spots and other defects in the subsequent enamelling process

[0003] In order to obtain better performance steel for enamelling, before the application of the present invention, No. ZL90102120.2 Chinese invention patent specification disclosed a "steel plate for enamelling and its manufacturing method", and ZL00801729.8 Chinese invention patent specification disclosed a "Steel plate for continuous casting enamel with excellent formability, anti-foaming, anti-black spot and enamel adhesion and its manufacturing method", No. ZL01802486.6 Chinese invention patent specification discloses a "processability, Enamelled steel plate with excellent timeliness and glazing properties and its manufacturing method", but the above-mentioned patent specification still adopts the method of hot rolling + cold rolling + annealing to produce enamelling steel, and the firing temperature is generally 850°C Below, the holding time is only 3 minutes, which does not effectively solve a series of defects in the early enamelled steel

Moreover, its enamelling method is single, and its practical application is very limited.

To sum up, the existing enamelling steel has low strength, poor enamel adhesion performance, and insufficient high-temperature enamelling performance, which greatly restricts its application.

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