Subsequently , the RSP became a unit of the Steel Authority of India Ltd ( SAIL ) .
On 3 February 1959 , then president Rajendra Prasad inaugurated RSP 's first blast furnace named ' Parvati ' when the company was known as Hindustan Steel Limited ( HSL ) .
Subsequently , the RSP became a unit of the Hindustan Steel Limited         ( Hindustan Steel Limited ) .
On 3 February 1959 , then president Rajendra Prasad inaugurated RSP 's first blast furnace named ' Parvati ' when the company was known as Hindustan Steel Limited ( HSL ) .