agricultural chain 1. 40Mn, 45Mn quality alloy steel 2. carbonized harden 3. competitive price 4. trend to long cooperation Agriculture Chain1)Model numbers: S type agriclutural chain: S32, S42, S52, S52L, S55, S55VH, S62, S77, S88 CA type agriclutural chain: CA550, P41.3, CA550H, CA550VH, CA555, CA620, 38.4R, 38.4VB, ZGS38 chain: 4000 type, 4600 type Attachment: K1, WK1, F1, F3, SD, K39M, C6E, ...