This study analyzes how high-tech SMEs approach CSR focused internationalization through networking and trust. Research has so far concentrated on CSR in large companies as it is not a usual practice in SMEs, particularly in connection with internationalization. High-tech SMEs face resource constraints and knowledge to apply CSR as a competitive tool in internationalization. In this paper, it is argued that development and implementation of CSR based internationalization in SMEs is a difficult learning process, which needs to be coordinated and supported by other firms in their network. Trust between the partners is necessary for collaboration. By applying an interactive approach, data has been collected from the ongoing marketing process in four high-tech Swedish SMEs in the steel industry. All the participating SMEs understand the importance of CSR in international marketing. However, success of CSR implementation in the SMEs varied depending on the area of business. The least CSR implemented SME focused on the improvement of work environment and financial sustainability through partnership with the customers and the investors. The most successful CSR focused company dealt with industrial residues and extraction of other minerals from hazardous waste for selling, making the reuse of residues possible. This study highlights the need of sustainability, both for the high-tech manufacturing SMEs and creating a strong selling argument towards the international buyers.