Yunjun ST Co., Ltd. is a company specializing in temporary civil engineering facilities established in 2015, engaged in the manufacturing of processed steel pipes and pipe connectors. Based on its proprietary patented HPS method technology, the company develops and produces high-strength composite steel pipe structures. It operates a factory in Jeungpyeong-gun, Chungbuk, and maintains its headquarters in Seoul.

Yunjun ST Co., Ltd. is a specialized civil temporary construction company that develops, produces, and leases high-strength composite steel pipe structures (HPS method) that combine the advantages of conventional H-beams and steel pipes based on proprietary patented technology. We provide solutions that encompass all processes of construction, manufacturing, distribution, and engineering, pursuing the value of building structures and trust together.

Business sectors

• Design and Manufacturing of High-Strength Composite Steel Pipe Structures (HPS): Yunjun ST Co., Ltd. directly designs and manufactures proprietary HPS (High-strength Pipe Support) construction materials that combine the advantages of conventional H-beams and steel pipes. As a core material used in earth retaining construction for subways, tunnels, and large buildings, it ensures superior strength and durability through patented technology.
• Construction of Civil Engineering Temporary Structures and Material Rental: The company produces high-strength composite steel pipe structures such as earth retaining walls, bracing, and tie beams, and rents out materials and handles construction necessary for civil engineering temporary structures. In particular, the HPS method significantly widens the installation spacing of bracing, contributing to shortened construction periods and cost reduction.
• Engineering Services and Technical Sales: Yunjun ST is equipped with a one-stop service system covering everything from design to sales, manufacturing, construction, and after-sales service. Through engineering services, we conduct technical sales to ensure the HPS method is incorporated during the design phase, and we directly manage quality control throughout the entire process.

Products

• HPS Construction Method Materials (Earth Retaining Walls, Bracing, Ties): HPS construction method materials are high-strength composite steel pipe structures that combine the advantages of conventional H-shaped steel and steel pipes, and are utilized for earth retaining walls, bracing, ties, etc. Through their excellent structural performance, they enable the installation spacing of bracing to be expanded from 4.0m to 10.0m, thereby increasing construction efficiency.

Special Features

• Proprietary HPS Construction Method Patent Technology: Yoonjun ST Co., Ltd. considers the HPS construction method, for which it has secured numerous patents including 'flange-web reinforced steel sections' and 'steel pipe bracing connection structures,' as its core competitive advantage. This technology offers 5 to 8 times the compressive performance of conventional H-shaped steel sections, maximizing safety and construction efficiency.
• Design-Fabrication-Construction-After-sales Service One-Stop Service: The company has established a 'one-stop service' system in which it directly handles design, sales, fabrication, construction, and after-sales management, providing consistent quality control. Through this, customers can expect stable project progress and high satisfaction.
• Technology Cooperation with POSCO and INNOVILT Certification: Through a technology transfer agreement and an INNOVILT brand usage agreement with POSCO, Yunjun ST is stably securing high-quality raw materials and enhancing product reliability. This is a key factor in strengthening technological superiority and market competitiveness.

Job Information

• Main positions being recruited: We primarily hire welders, machine operators, metal painters, sales and sales support staff, and personnel responsible for earthworks and temporary earth retaining structure construction.
• Benefits: We provide the four major insurances, including National Pension, Employment Insurance, Industrial Accident Insurance, Health Insurance, and Accident Insurance. We also offer leave systems such as annual leave, half-day leave, company anniversary holidays, and Labor Day holidays. In addition to compensation and support such as severance pay, congratulatory and condolence payments, vehicle fuel allowances, holiday gifts/bonuses, book purchase subsidies, employee tuition assistance, gym membership fees, and vacation pay, we provide benefits including support for acquiring professional certifications, health checkups, lunch, and work uniform support.

💡 A word from Jobploy
Yunjun ST Co., Ltd. is a specialized company in the fields of steel pipe processing and temporary civil engineering structures, offering numerous technical and production roles including welding, machine operation, metal painting, and on-site construction. Foreign workers must be aware that these roles involve physical labor and that strict adherence to safety regulations is crucial. The company possesses proprietary patented technology and offers various benefits, such as the four major insurance plans, meal support, and work uniforms, ensuring a stable working environment.