1) Big size shaft 2) Materials: alloy, carbon and stainless steel 3) Weight: no more than 25MT 4) Process: forging, anneal Features: 1) Big size shaft 2) Materials: alloy, carbon and stainless steel 3) Weight: no more than 25MT 4) Process: forging, annealed, quenched, heat treatment and machining 5) Customers' designs welcomed6) According to national standards such as GB/T6402-91, JB4730-2000, ...