 Branch offices for storage and direct sales business, sometimes with tube processing workshops and pipeline construction capacities, were set up in cooperation with well-established companies all over the world, especially in South America, Asia, and South Africa.In addition, Mannesmannröhren-Werke took up the production of welded steel pipes, stainless steel pipes and other type of pipes and tubes.The company became the worldwide leading manufacturer of steel tube and pipe 

In the first decades of its existence, Mannesmann was a pure manufacturer and therefore highly dependent on third-party deliveries of starting material.