Hot-rolled thin enamelled steel with yield strength of 330mpa grade and manufacturing method

Abstract

The invention discloses hot-rolled thin plate enamelled steel with the yield strength of 330 MPa and a manufacturing method thereof; the thickness of the enamelled steel is 1.0-2.5 mm; the enamelled steel disclosed by the invention comprises the following chemical components in percentage by weight: 0.02-0.07% of C, less than or equal to 0.05% of Si, 0.10-0.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.04-0.10% of Ti, 0.02-0.08% of Als, less than or equal to 0.008% of N, and the balance of Fe and unavoidable inclusions; Ti / C=1.0-1.5; the manufacturing method is a CSP (Compact Strip Production) process and sequentially comprises the following fully continuous production steps: desulfurating molten iron; blowing the top and bottom of a converter in a compound manner; carrying out vacuum treatment; continuously casting into slabs; soaking through a soaking furnace; hotly and continuously rolling, and rolling and cooling in a controlled manner; rolling into steel coils. The hot-rolled thin plate enamelled steel disclosed by the invention has the advantages of being low in rolling load, good in plate shape control, low in production cost and high in efficiency, and therefore, the steel plate manufactured by the enameled steel has good scale blast resistance, high intensity and better seep drawing process performance.

Description

technical field [0001] The invention belongs to the technical field of micro-alloyed steel manufacturing, and in particular relates to a yield strength of 330MPa grade (ie yield strength R eL 330-450MPa) hot-rolled thin enamelled steel and its manufacturing method. Background technique [0002] With the development of industrial technology and the improvement of scientific and technological capabilities, in order to improve product quality and reduce manufacturing costs, it has gradually become a trend to replace cold steel with heat for enameled products. In the past related domestic and foreign research literature, there have been some achievements in hot-rolled water heater inner tank enamel steel, etc. For example, the patent literature with the application number CN200810047087.2 introduces a C produced by conventional hot rolling process: 0.01~0.15%, Si≤0.04%, Mn: 0.50~0.90%, P≤0.070%, S≤0.015%, Ti: 0.005~0.060%, Als: 0.005~0.070% composition of water heater inner tan...

AI Technical Summary

Problems solved by technology

However, compared with the conventional hot rolling furnace, the heating temperature of the soaking furnace of the conventional CSP production line is low and the heating time is short, which will cause Ti not to be completely dissolved in the enamelled steel, thus affecting the precipitation of the second phase of Ti in the enamelled steel Size and number of substances (TiC and TiN)

Therefore, the yield strength of enamelled steel produced by conventional CSP production lines is difficult to control, resulting in a wide range of fluctuations in the performance of enameled steel

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