High-strength hot rolled steel plate for counter enameling and manufacturing method thereof

Abstract

The invention relates to a high-strength hot rolled steel plate for counter enameling and a manufacturing method thereof. The high-strength hot rolled steel plate for counter enameling comprises the following smelting components in weight percent: 0.012-0.03 percent of carbon (C), not greater than 0.10 percent of silicon (Si), 0.55-1.0 percent of manganese (Mn), 0.05-0.11 percent of phosphorus (P), not greater than 0.006 percent of sulfur (S), not greater than 0.005 percent of nitrogen (N), 0.08-0.20 percent of titanium (Ti), 0.005-0.055 percent of aluminum sulfide (Als), 5-15 percent of Ti/C and the balance of ferrum and inevitable impurities, wherein more than one or two of vanadium, boron (B), copper (Cu) and chromium (Cr) is selectively added. The manufacturing method comprises the following steps: producing a plate blank through continuous casting; evenly heating the plate blank to 1180-1260 DEG C; then, removing phosphorous with high-pressure water and carrying out rough rolling to prepare an intermediate blank; carrying out 5-7-pass finish rolling to target thickness; carrying out laminar flow cooling to 570-680 DEG C and coiling. The high-strength hot rolled steel plate for the counter enameling has no phosphorus explosion; the yield strength is higher than 280MPa after the high-strength hot rolled steel plate for the counter enameling is enameled under the conditions that the temperature is 800-920 DEG C and the thickness is greater than 8mm. The high-strength hot rolled steel plate for the counter enameling is suitable for roll forming, bend forming and simple punch forming and is a reliable special steel plate material for a counter enameling assembly structure.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to the production and manufacture of low-alloy hot-rolled steel plates, in particular to a high-strength double-sided enamelled hot-rolled steel plate and a manufacturing method thereof. Background technique [0002] In large-scale water treatment facilities, chemical facilities, environmental protection facilities, and biomass energy projects, the use of enamel assembly structures has obvious advantages such as low investment costs, short construction periods, and long service life of equipment. [0003] The main material of the enamel assembled structure is a hot-rolled steel plate with good double-sided enamel performance. In order to meet the structural design requirements, the thickness of the steel plate is generally 3.0mm to 16mm, and the yield strength level after enamelling is generally above 200MPa. [0004] Although the cold-rolled enamel steel plate can meet the perform...

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Problems solved by technology

[0010] Aiming at the problems of insufficient strength of cold-rolled enamel steel plates and the existing hot-rolled steel plates are not suitable for enamel firing in the rainy season and are not suitable for dense enamel enamel afte

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