Prime quality 3sp billets required

We require primary quality steel billets as follows:
3SP/PS + HIGHER
MANGANESE
According to below
chemistry:
C - 0.14% - 0.22%
MN - 0.55% - 0.80%
SI - 0.05% max
P - 0.04% max
CU - 0.30% max
Ni - 0.30% max
Cr - 0.30% max
SIZE
75 X 75 X 6MTR OR 11.8MTR
CFR MOMBASA
We need 500MT or more monthly.