700 MPa-grade hot-rolled container steel and low-cost production method thereof

Abstract

The invention discloses 700 MPa-grade hot-rolled container steel and a low-cost production method thereof. The hot-rolled container steel has corrosion resistance, cold bending property, and of the container steel comprises the following alloy composition of, in percentage by mass, 0.05-0.09% of C, 1.20-1.50% of Mn, 0.35-0.50% of Si, 0.020-0.050% of Al, 0.20-0.40% of Cu, 0.50-0.70% of Cr, 0.070-0.100% of Ti, not greater than 0.015% of P, not greater than 0.005% of S, not greater than 0.0060% of N and not greater than 0.005% of O. According to the 700 MPa-grade hot-rolled container steel and the low-cost production method thereof, the hot-rolled container steel component design is low in alloy content, pure in molten steel, and capable of saving the cost on the basis of ensuring excellent performance; and the high compression ratio is achieved, and the structure and the performance of finished products are improved; and in terms of mechanical property, various indexes meet the requirements, and the surplus amount is relatively sufficient.

Description

technical field [0001] The invention belongs to the steelmaking process, and in particular relates to a 700MPa grade hot-rolled container steel and a low-cost production process thereof. Background technique [0002] Generally, goods sent from China to the United States use standard 20-foot or 40-foot sea containers, while the road and rail transportation systems in the inland areas of the United States are well developed. In order to save freight and improve transportation efficiency, the inland areas of the United States generally use larger containers 53-foot North American inland containers for transportation, so these standard 20-foot or 40-foot sea containers will be re-stacked at American ports and loaded into 53-foot North American inland containers for transportation. This method is time-consuming and laborious, and consumes serious social resources . Therefore, the domestic container industry puts forward the requirement of developing 53-foot special containers. ...

AI Technical Summary

Problems solved by technology

Most steel mills are facing the following technical problems: 1. High strength, good corrosion resistance, good cold bending performance

2. The cost of alloying is relatively high, especially under the background of weak economic growth and high cost, both steel production enterprises and user enterprises feel the pressure

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