Thin rare earth-containing hot rolled steel plate for enamel liner of water heater, and production method of steel plate

Abstract

The invention relates to a thin rare earth-containing hot rolled steel plate for an enamel liner of a water heater, and a production method of the steel plate. The material of the steel plate comprises the following chemical components in percentage by weight: 0.02 to 0.05 percent of C, 0.015 to 0.50 percent of Si, 0.10 to 0.20 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.025 percent of S, more than or equal to 0.015 percent of Alt, less than or equal to 0.01 percent of Re and the balance of Fe and inevitable impurities. The tissue of the steel plate comprises ferrite and a small amount of pearlite. According to the steel plate, the yield strength is more than 230 Mpa, the tensile strength is more than 320 Mpa and the extension rate is more than 45 percent. The heating temperature is 1,080 to 1,150 DEG C, the initial rolling temperature is 1,050 to 1,100 DEG C, the finishing rolling temperature is 860 to 890 DEG C, the reeling temperature is 550 to 600 DEG C, the total press-down rate of rolling is more than or equal to 85 percent, and rolling is performed in a dispersing and cooling form. The thin rare earth-containing hot rolled steel plate disclosed by the invention has the advantages that the trace element Re is added on the basis of C-Mn steel, and a controlled rolling and controlled cooling technology is adopted, so the cost performance is high, the cost is low, and the performance completely accords with the requirements of the thin steel plate for the enamel liner.

Description

technical field [0001] The invention relates to a thin gauge rare earth-containing hot-rolled steel plate for an enamel inner tank of a water heater and a production method, belonging to the field of metallurgical steel rolling. Background technique [0002] With the development and progress of society and people's eternal pursuit of beauty, enamel steel plate is a new high-grade material. It is a thin steel plate user second only to the automobile industry. It has unique advantages such as acid and alkali resistance, high temperature and corrosion resistance, fire prevention and rust resistance, various colors, durable, clean and hygienic, easy to wash, and not easy to wear, and it does not absorb oil. Smoke and moisture should occupy a unique position in kitchen sanitation, household appliances, and urban public facilities. Because the thin-gauge steel plates used for water heater enamel inner tanks have high requirements on product performance, the existing thin-gauge st...

AI Technical Summary

Problems solved by technology

Since the thin-gauge steel plates for water heater enamel inner tanks have high requirements on product performance, the existing thin-gauge steel plates for water heater enamel inner tanks are all high-cost cold-rolled products