We plan to purchase billets: S20C, S45C, S50C

Now, we plan to purchase billet and ingot as below:
1. carbon steel : S20C, S45C, S50C
dimension : 320mm*340mm, length is 3m-6m.
required quantity: more than 10000T per month
2. alloy steel: SCM420, SCM440
　dimension : 320mm*340mm, length is 3m-6m
required quantity: more than 5000T