[Quality Management System] ISO 9001 (Kor. Version)
[Quality Management System] ISO 9001 (Eng. Version)
[Quality Management System] P.E.D (Dangjin Factory)
[Quality Management System] P.E.D (Daebul Factory)
[Quality Management System] ISO 9001 Daegu Factory (Kor. Version)
[Quality Management System] ISO 9001 Daegu Factory (Eng. Version)
[Occupational Health and Safety Management System] ISO 45001 Dangjin Factory
[Occupational Health and Safety Management System] ISO 45001 Daebul Factory
[Product Certificate] Carbon Steel Pipe for Ordinary Piping (KS D 3507, Kor. Version)
[Product Certificate] Carbon Steel Tube for Boiler and Heat Exchanger (KS D 3563, Kor. Version)
[Product Certificate] Carbon Steel Pipe for Fuel Gas Piping (KS D 3631, Kor. Version)
[Product Certificate] Carbon Steel Pipe Pressure Service (KS D 3562, Kor. Version)
[Product Certificate] Rigid steel Conduit (KS D 8401, Kor. Version)
[Product Certificate] Carbon Steel Tube for Machine Structure (KS D 3517, Kor. Version)
[Product Certificate] Carbon Steel Tube for General Structural Purpose (KS D 3566 Kor. Version)
[Product Certificate] Carbon Steel Pipe for Structural Purposes (KS D 3632, Kor. Version)
[Product Certificate] Rigid Steel Conduits (JIS C 8305)
[Product Certificate] Carbon Steel Pipe for Ordinary Piping (JIS G 3452)
[Product Certificate] Carbon Steel Pipe for Pressure Service (JIS G 3454)
[Product Certificate] Carbon Steel Tube for Boiler and Heat Exchanger (JIS G 3461)
[Product Certificate] Carbon Steel Tube for General Structural Purpose (JIS G 3444)
[Product Certificate] Carbon Steel Tube for Machine Structure (JIS G 3445)
[Product Certificate] API 5CTCasing&Tubing
[Product Certificate] API 5L Line Pipe
[Product Certificate] UL6 RIGID METAL CONDUIT
[Product Certificate] CUL RIGID METAL CONDUIT
[Product Certificate] NSF ANSI 372
[Marine Certificate] DNVGL
[Marine Certificate] KR
[Marine Certificate] LR
[Marine Certificate] NK
[Marine Certificate] BV
[Marine Certificate] RS
[Product Certificate] Carbon Steel Pipe for Ordinary Piping (KS D 3507)
[Product Certificate] Carbon Steel Pipe for Ordinary Piping (KS D 3562)
[Product Certificate] Carbon Steel Tube for General Structural Purpose (KS D 3566)
[Product Certificate] Steel Square Pipe for General Structural Purpose (KS D 3568)
[Product Certificate] Carbon Steel Pipe for Fuel Gas Piping (KS D 3631)
[Product Certificate] Carbon Steel Pipe for for Structural Purpose (KS D 3632)
[Product Certificate] Carbon Steel Square Pipe for Structuural Purpose (KS D 3864)
[Product Certificate] Carbon Steel Tube for General Structural Purpose (JIS G 3444)
[Product Certificate] Carbon Steel Pipe for Ordinary Piping (JIS G 3452)
[Product Certificate] Steel Pipe Piles (KS F 4602)
[Product Certificate] Carbon Steel Pipe for Pressure Service (JIS G 3454)
[Product Certificate] Steel Pipe Piles (JIS A 5525)
[Product Certificate] Steel Square Pipe for General Structural Purpose (JIS G 3466)
[Product Certificate] API 5CT Casing Tubing
[Product Certificate] API 5L Line Pipe
[Marine Certificate] BV
[Marine Certificate] DNVGL
[Marine Certificate] LR
[Marine Certificate] NK
[Marine Certificate] KR
[Marine Certificate] RINA
[Marine Certificate] CCS
[Environment Certificate] ISO_14001 (Kor. Version)
[Environment Certificate] ISO_14001 (Eng. Version)
[Product Certificate] Stainless Steel Pipe for Ordinary Piping (KS D 3595)
[Product Certificate] Stainless Steel Pipe for Piping (KS D 3576)
[Product Certificate] Stainless Steel tube for Boiler and Heat Exchange Piping (KS D 3577)
[Product Certificate] Stainless Steel Pipe for Piping (JIS G 3459)
[Product Certificate] Stainless Steel Pipe for Ordinary Piping (JIS G 3448)
[Environment Certificate] Stainless Steel Pipe for Piping (KC)
[Environment Certificate] Stainless Steel Pipe for Ordinary Piping (KC)
[Quality Management System] ISO 9001 Daegu Factory (Kor. Version)
[Quality Management System] ISO 9001 Daegu Factory (Eng. Version)