1964 : Established by Adamjee Group, named National Tubes.
1964 : Galvanizing plant (nominal diameter 1/2” to 4”) went into operation.
1972 : Nationalized and treated as an enterprise of BSEC
1980 : Company name changed to National Tubes Limited.
1980 : The second manufacturing mill (nominal diameter : ½” to 4”) went into operation.
1982 : The 3rd manufacturing mill (nominal diameter : 4” to 8”) went into operation.
1989 : Transformed into a public limited company by offloading 49 percent shares to the general public
and 51 percent shares are holding by the government.
1992 : Authorized to use API Monogram (License No.5L – 0025) for manufacturer of plain end line pipe PSL 1.
2001 : NTL was listed as one of the best ten companies in stock market evaluated by the DSE.
2002 : Authorized to use ”BSTI monogram” on GI, MS (A class) pipes.
2004 : Obtained ISO 9001 certification for quality management system applies to the manufacturer of line pipe.
2004 : Obtained API specification Q1 for quality management system applies to the manufacturer of Line Pipe.