A kind of high-strength steel plate for enamel inner tank and manufacturing method thereof

Abstract

The invention discloses a high strength steel plate used for enamel liners. The high strength steel plate comprises: 0.04%-0.10% of C, less than or equal to 0.05% of Si, 0.60%-1.2% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.04%-0.12% of Ti, 0.005%-0.060% of Als, 0.08%-0.30% of Cr, and the balance iron and unavoidable impurities. The manufacturing method of the high strength steel plate includes: heating a continuous casting billet to 1180-1250DEG C, conducting soaking, then carrying out high pressure water descaling and rough rolling cogging; starting finish rolling at 1100-980DEG C, and ending rolling at 950-880DEG C; performing laminar cooling, and conducting reeling in a temperature range of 570-660DEG C; letting a steel coil cool naturally, then performing flattening to an elongation rate of 0.6%-1.5%, subjecting the flattened steel plate to tensile straightening to an elongation rate of 0.8%-1.7%, and then performing pickling.

Description

technical field [0001] The invention belongs to low-alloy hot-rolled steel plates, in particular to a high-strength steel plate for an enamel inner container and a manufacturing method thereof. Background technique [0002] The quality of the inner tank of the water heater directly determines the service life and safety of the water heater. Therefore, higher requirements are put forward for the material of the liner: high strength, good formability, etc. Although there are many materials for making the inner tank of an electric water heater, in fact it is mainly made of stainless steel plate or enamel-coated with ordinary steel plate. [0003] Patent No. 201110126622.5 "High-strength cold-rolled steel plate for water heater inner tank and its continuous annealing process", adopts cold rolling and continuous annealing process, and obtains a steel plate that can meet the needs of water heater enamel inner tank. The mass percentage of its chemical composition is C: 0.04~0.10%...

AI Technical Summary

Problems solved by technology

In this patent, the Mn content of the steel plate is low, which will increase the yield strength reduction of the steel plate after enamelling; while the P content is too high, the slab center segregation is prone to occur, resulting in stratification of the continuous casting slab, which has no effect on the performance of the steel plate

The strength of the steel plate produced by this method is low, and the yield strength level is 250MPa, which cannot meet the requirement of longer life of the water heater liner

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