| material | code | chemical composition（%） | surface hardness（hsd） | |||||||||||
| c | si | mn | cr | ni | mo | p | s | v | cu | mg | barrel | neck | ||
| bainite nodular centrifugal combined rollsⅰ | saⅰ | 2.90-3.60 | 1.40-2.40 | 0.20-0.80 | 0.10-0.50 | 3.00-3.50 | 0.50-1.00 | ≤0.10 | ≤0.03 | 55-75 | 32-45 | |||
| bainite nodular centrifugal combined rolls ⅱ | saⅱ | 2.90-3.60 | 1.20-2.00 | 0.20-0.80 | 0.30-1.50 | 3.50-4.50 | 0.50-1.00 | ≤0.10 | ≤0.03 | 60-80 | 32-45 | |||