[Quality Management System] ISO 9001 (Kor. Version)

[Quality Management System] ISO 9001 (Eng. Version)

[Quality Management System] P.E.D (Dangjin Plant)

[Quality Management System] P.E.D (Daebul Plant)

[Quality Management System] ISO 9001 Daegu Plant (Kor. Version)

[Quality Management System] ISO 9001 Daegu Plant (Eng. Version)

[Occupational Health and Safety Management System] ISO 45001 Dangjin, Daebul, and Gunsan Plants (Kor. + Eng. Version)

[Environmental Product Declaration] EPD (Dangjin and Daebul Plants)

[Quality Management System] P.E.D (Gunsan Plant)

[Product Certificate] Carbon Steel Pipes for Ordinary Piping (KS D 3507, Kor. Version)

[Product Certificate] Carbon Steel Tubes for Boiler and Heat Exchanger Applications (KS D 3563, Kor. Version)

[Product Certificate] Carbon Steel Pipes for Fuel Gas Piping (KS D 3631, Kor. Version)

[Product Certificate] Carbon Steel Tubes for Welded Structure (KS D 3632, Kor. Version)

[Product Certificate] Carbon Steel Pipes for Pressure Service (KS D 3562, Kor. Version)

[Product Certificate] Rigid Steel Conduits (KS C 8401, Kor. Version)

[Product Certificate] Carbon Steel Tubes for Machine Structural Purposes (KS D 3517, Kor. Version)

[Product Certificate] Carbon Steel Tubes for General Structural Purposes (KS D 3566, Kor. Version)

[Product Certificate] Rigid Steel Conduits (JIS C 8305)

[Product Certificate] Carbon Steel Pipes for Ordinary Piping (JIS G 3452)

[Product Certificate] Carbon Steel Pipes for Pressure Service (JIS G 3454)

[Product Certificate] Carbon Steel Tubes for Boiler and Heat Exchanger (JIS G 3461)

[Product Certificate] Carbon Steel Tubes for General Structure (JIS G 3444)

[Product Certificate] Carbon Steel Tubes for Machine Structure (JIS G 3445)

[Product Certificate] API 5CT Casing & Tubing

[Product Certificate] API 5L Line Pipe

[Product Certificate] CULCNL Rigid Metal Conduit

[Product Certificate] UL 6 RIGID METAL CONDUIT

[Classification Society Certificate] DNV

[Classification Society Certificate] KR

[Classification Society Certificate] LR

[Classification Society Certificate] NK

[Classification Society Certificate] BV

[Product Certificate] Carbon Steel Pipes for Ordinary Piping (KS D 3507)

[Product Certificate] Carbon Steel Pipes for Pressure Service (KS D 3562)

[Product Certificate] Carbon Steel Tubes for General Structural Purposes (KS D 3566)

[Product Certificate] Carbon Steel Square Pipes for General Structural Purpose (KS D 3568)

[Product Certificate] Carbon Steel Pipes for Fuel Gas Piping (KS D 3631)

[Product Certificate] Carbon Steel Tubes for Welded Structure (KS D 3632)

[Product Certificate] Cold Rolled Carbon Steel Pipes for Welded Structure (KS D 3864)

[Product Certificate] Steel Pipe Piles (KS F 4602)

[Product Certificate] Carbon Steel Tubes for General Structure (JIS G 3444)

[Product Certificate] Carbon Steel Pipes for Ordinary Piping (JIS G 3452)

[Product Certificate] Carbon Steel Pipes for Pressure Service (JIS G 3454)

[Product Certificate] Steel Pipe Piles (JIS A 5525)

[Product Certificate] Carbon Steel Square and Rectangular Tubes for General Structure (JIS G 3466)

[Product Certificate] API 5CT Casing & Tubing

[Product Certificate] API 5L Line Pipe

[Classification Society Certificate] BV

[Classification Society Certificate] DNV

[Classification Society Certificate] LR

[Classification Society Certificate] NK

[Classification Society Certificate] KR

[Classification Society Certificate] RINA

[Classification Society Certificate] CCS

[Environment Certificate] ISO 14001 (Kor. Version)

[Environment Certificate] ISO 14001 (Eng. Version)

[Product Certificate] Stainless Steel Pipes for General Purpose Piping (KS D 3595)

[Product Certificate] Stainless Steel Pipes (KS D 3576)

[Product Certificate] Stainless Steel for Boiler and Heat Exchanger Tubes (KS D 3577)

[Product Certificate] Stainless Steel Pipes (JIS G 3459)

[Product Certificate] Light Gauge Stainless Steel Tubes for Ordinary Piping (JIS G 3448)

[Environment Certificate] Stainless Steel Pipe for Piping (KC)

[Environment Certificate] Stainless Steel Pipe for Ordinary Piping (KC)

[Product Certificate] Arc Welded Carbon Steel Pipes (KS D 3583)

[Product Certificate] Carbon Steel Tubes for General Structural Purposes (KS D 3566)

[Product Certificate] Carbon Steel Tubes for Welded Structure (KS D 3632)

[Product Certificate] Steel Pipe Piles (KS F 4602)

[Product Certificate] CPR & EN 1090 Certification (Eng. Version)

[Quality Management System] ISO 3834-2 Certification (Eng. Version)

[Environment Certificate] ISO 14001 Certification (Kor. Version)

[Environment Certificate] ISO 14001 Certification (Eng. Version)

[Product Certificate] Carbon Steel Tubes for General Structure (JIS G 3444)

[Product Certificate] Arc Welded Carbon Steel Pipes (JIS G 3457)

[Product Certificate] Carbon Steel Tubes for Building Structure (JIS G 3475)

[Product Certificate] Steel Pipe Piles (JIS A 5525)

[Product Certificate] API 5L

[Product Certificate] API 2B