Seojin System powers up megacasting production in Southeast Asia

The inauguration of the first system in early 2025 was celebrated at a ceremony with industry leaders and government representatives. Swiss Ambassador to Vietnam, Thomas Gass, highlighted the international relevance of the achievement: “When Swiss innovative technology, Vietnamese determination, and Korean automotive expertise combine, production efficiency improves and supply chains are stronger and more resilient.”

For Seojin System, the investment is an important step in strengthening its position as a global Tier 1 supplier. “With Bühler’s cutting-edge solutions, combined with Vietnam’s advantages in logistics, tax incentives, and its skilled workforce, we gain a substantial competitive edge in supplying superior cast automotive parts worldwide,” says Jun Dong Kyu, President of Seojin System. Bühler’s Cornel Mendler, Managing Director Die Casting, underlined the strength of the collaboration: “Since our partnership began in 2019, Seojin has invested not only in Bühler solutions but also in building expertise and skills. Together we are shaping the transformation of the automotive industry.”

The new installations build on a relationship that started with the Carat 610 project six years ago. Since then, Seojin has continuously expanded its production capabilities, positioning itself as a trusted supplier to global original equipment manufacturers (OEMs). With the Carat 920 cells, the company is now able to manufacture larger and more complex structural parts, enhancing its competitiveness in a fast-changing market.

Megacasting is transforming modern vehicle manufacturing by replacing assemblies of up to 100 individual parts with a single die-cast structure. This simplifies production and reduces welding and joining steps while also lowering scrap rates, cutting material waste, and enabling lighter and more rigid vehicles. For OEMs, it means greater efficiency, less complexity, and improved sustainability.

Bühler has been at the forefront of die-casting technology for nearly a century. Its Carat series was developed specifically to meet the growing demand for larger structural castings in automotive manufacturing, with locking forces ranging from 10,500 to 92,000 kilonewtons. Today, more than 950 Carat solutions are in operation worldwide, making it one of the most widely adopted platforms for large-scale automotive castings.

With the installation of two Carat 920s in Vietnam, Bühler and Seojin System are continuing their joint success story while bringing megacasting to a new region. The project not only enhances Seojin’s role in supplying critical EV components but also positions Vietnam as an emerging hub for megacasting and the wider automotive value chain in Southeast Asia.