Test to melt weathering-resisting steel SPA-H ( % : W0. 12C

0. 30 ~ 1. 25Cr

0. 25 ~ 0. 55Cu) by both processes of 60 t converter (liquid temperature 1 653℃ )- LF refining (slag basicity 2. 5 ~3. 0

feeding Al wire

Ar stirring) and hot metal pretreatment ([S

]

≤0. 010% ) -60 t converter (liquid temperature 1 670 °C

adding 80 ~ 100 kg refining slag during tapping) -ladle feeding Al wire and Ar stirring ≥8 min has been carried out. Results by 62 heats practice show that for heats with LF refining

[O

]

before argon stirring is 37. 7 x 10

-6

feeding wire 25 kg

average [S

]

is 0. 014% ； and for heats without LF refining

[O

]

before argon stirring is 53. 3 X 10

-6

feeding wire 33. 9 kg

average [S

]

is 0. 017% ； the mechanical properties and inclusion ra

ting of weathering-resisting steel produced by both processes all meet the requirement

but the process without LF refining is available to increase productivity and reduce consumption of materials.