The pilot production flow sheet for 300 mm x 300 mm bloom of steel EA1N (/%: 0. 32 ~0. 38C

0. 15 ~0. 35Si

0. 80 ~ 1. 10Mn

≤0. 015P

≤0.010S) for axle is 60 t EAF-LF-VD-8.4 t ingot casting-1 000 mm blooming mill breakdown process. With the process measures including EAF hot charging ≥70% pre-treating hot metal

EAF controlling end [ P

]

≤008P and [C

]

≥O.10%

10% heel liquid in tapping

refining with high basicity slag ( CaO)/( SiO

2

) =4 ~ 7 and feeding Al wire to control [Al

]

s 0. 020% ~0. 040%

after VD process feeding 0. 5 kg/t Si-Ca wire and argon shielding ingot casting

the cleanliness of produced steel EA1N is [ O

]

≤15 x 10

-6

[H

]

≤1. 0 x 10

-6

[N

]

≤80 x 10

-6

P ≤0. 015%

S ≤0. 005%

and inclusion rating of A

B

C and D series ≤1. 0； the technical indexes of bloom an

d axle of steel EA1N all meet specification requirement for axle of high-power electric locomotive.