Corporación Aceros Arequipa S.A. is a Peruvian company dedicated to the production and marketing of steel.[2]​ It is one of the main companies that supplies this material in the country.[3]​ It is a component company of the S&P/BVL Peru General index.

The company was founded in 1964 in the city of Arequipa, beginning its operations in 1966 with the production and marketing of profiles and smooth steel bars for the metal-mechanical, construction and metal carpentry industries.[3]​.

In 1983, they inaugurated their second rolling plant in the city of Pisco "Pisco (city)"), south of Lima, and ventured into the manufacture of corrugated bars and metal wire rods.

In 1988, the merger with Laminadora del Pacífico allowed it to expand its operations to the manufacture of steel in the form of billets, raw material for hot rolled products.[4]​.

In 1996, they invested 16 million dollars in technology and put into operation the sponge iron plant in Pisco, to improve the quality of their finest steel and ensure timely supply to the market.

In 1997, it merged with the company Aceros Calibrados S.A. in order to expand its product portfolio. As a result, it was formalized as Corporación Aceros Arequipa S.A. (CAASA).[5]​.

In 2002, CAASA invested 9.5 million dollars in the automation of the rolling line and the implementation of the cold rolling plant in Pisco.

In 2004, an investment of 14.5 million dollars was made for the implementation of the new wire rod production line. A few months later they began the conversion project to natural gas and put the recycled steel fragmentation plant into operation.

In July 2007, the works that increased the production capacity of the Pisco plant were completed. This first stage of expansion meant an investment of more than 45 million dollars and made it possible to increase production capacity from 350 thousand to 550 thousand tons of steel per year.

By 2010, 800,000 tons of liquid steel were produced annually, which makes the corporation one of the producers and exporters at the regional level,[6]​ whose main objective is to continue satisfying the needs of the national and regional market, contributing to the development of Peru.

In 2016, management changed, and after untimely and massive layoffs, the Arequipa Plant closed.[7]​.

In 2021, the company obtained the highest Dow Jones MILA Sustainability Index in Latin America.[8]​.