Quality certification

• ACRS CERTIFICATION_POSCO INTERNATIONAL_T1010 (2019)
• Japan Construction Steel Frame Welding Structural Performance Evaluation
  (H Grade) Certificate
  POSCO International_December 20, 2019
• Gwangyang) POSCO Inter_RS Classification Certificate
  (expiration date October 16, 2022)
• Pohang) POSCO Inter_RS Classification Certificate
  (expiration date August 22, 2024)
• Gwangyang)POSCO Inter_RINA Classification Certificate
  (expiration date August 31, 2020)
• Pohang)POSCO Inter_RINA Classification Certificate
  (expiration date October 31, 2020)
• Gwangyang)POSCO Inter_KR Classification Certificate
  (expiration date December 12, 2021)
• Pohang)POSCO Inter_KR Classification Certificate
  (expiration date October 31, 2023)
• ISO9001_2015 DNV Certificate (expiration date November 2, 2020)
• ISO9001 2015 Certificate_SMC (expiration date June 22, 2022)
• Construction Business Registration_Steel structure construction business