Hot rolled band for container and method for manufacturing same

Abstract

The invention relates to a hot rolled band for a container and a method for manufacturing the same. The hot rolled band comprises the following chemical components in percentage by mass: more than 0 and less than or equal to 0.12 percent of C, more than or equal to 0.15 and less than or equal to 0.30 percent of Si, more than or equal to 0.70 and less than or equal to 1.40 percent of Mn, more than 0 and less than or equal to 0.020 percent of P, more than 0 and less than or equal to 0.008 percent of S, more than 0 and less than or equal to 0.050 percent of Ti, and the balance of Fe and inevitable impurities. The method for manufacturing the hot rolled band comprises the following steps: A, preparing continuous casting slabs through molten iron pretreatment and desulfuration, smelting of a top-bottom blowing converter, LF refinement and slab continuous casting; and B, adopting a controlled rolling and controlled cooling process to machine the continuous casting slabs into the hot rolled band, wherein a final rolling temperature is between 810 and 910 DEG C, quickly cooling the hot rolled band in water to the temperature of between 450 and 650 DEG C, reeling the hot rolled band up and then cooling the hot rolled band to the room temperature. The band machined by the method for manufacturing the hot rolled band for the container has the characteristics of lower cost, harmful element content and banded structure level, higher comprehensive mechanical properties and good molding property.

Description

technical field [0001] The invention relates to a hot-rolled steel strip for a container and a manufacturing method thereof. Background technique [0002] Container transportation has the advantages of safety and speed, and is especially suitable for transporting high-value-added and collision-prone goods. Therefore, more and more bulk cargo transportation has been changed to container transportation, and the volume of container transportation has risen sharply, and the container manufacturing industry has developed rapidly. . Steel accounts for about 90% of the total weight of the container, and more than 96% of the steel used in the container is hot-rolled steel strip. Stamping and bending are the most important forming methods for the hot-rolled steel strip used in the container. Therefore, in addition to requiring high dimensional accuracy, In addition to good shape and surface quality, stable mechanical properties, and excellent corrosion resistance, it is also require...

AI Technical Summary

Problems solved by technology

While the strength of existing hot-rolled steel strips for containers is improved, there are stamping or bending cracks, which seriously affect the stable production and safe use of containers.

[0003] "Experimental Research on SM490YA Steel for Containers" (hereinafter referred to as document ①), published in the 3rd issue of "Steel Research" in 2008, provides a SM490YA hot-rolled steel strip for containers, but in order to ensure the formability of the steel strip , but it is necessary to feed expensive rare earth wires into the crystallizer during continuous casting, which not only increases the manufacturing cost of the steel strip, but also is prone to quality problems such as rare earth inclusions, surface cracks and nozzle nodules in actual production, resulting in Mechanical properties and molding fluctuate, and increase production difficulty

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