A.石墨细化 B.石墨分解 C.渗碳体分解为石墨 D.石墨分解为渗碳体
A.淬火+低温回火 B.淬火+中温回火 C.淬火+低温回火或淬火+高温回火 D.淬火+高温回火
A.≥15% B.>8% C.>12% D.>10%
A.Mn B.Al C.Mg D.Si
A.GCr15 B.Cr12MoV C.1Cr13 D.1Cr18Ni9Ti