The company had clocked sales of 3.4 mt in 2014-15, it said in a statement.
"In continuation with our focus to fully utilise our built-up capacities and ramp up production, JSPL has achieved more than 4 mt of steel production and sales for 2015-16," it added.
The just-concluded January-March quarter marked both consolidated, production and sales of more than a million tonne in a single quarter, a first for JSPL, the firm said.
"Our consolidated steel sales for 2015-16 stood at 4.4 mt, up 30 per cent against 3.4 mt in 2014-15, while production stood at 4.5 mt, up 24 per cent against 3.7 mt in 2014-15," JSPL added.
On a stand-alone basis, JSPL said that for the March quarter, steel sales grew 37 per cent to 1 mt from 0.74 mt in October-December while production was at 0.97 mt as against 0.78 mt during the same period.
Last year, in January-March, sales came in at 0.78 mt and production stood at 0.88 mt.
"Our growth has been backed by a steady and gradual ramp-up of our Angul (Odisha) plant, which nearly doubled production from 0.46 mt in 2014-15 to 0.9 mt in 2015-16," it said.
