20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn
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20CrMn (GB/T 3077-1988)  
     ●特性及適用范圍:                                                      
     是滲碳鋼，也可用作調質鋼，淬透性與20CrNi相近。用作在高速與高彎曲負荷下工
 作的軸、連桿，在高速、高負荷而無強沖擊負荷下工作的齒輪軸、齒輪、水泵轉子、離
 合器、小軸、心軸，在化工設備上可作高壓容器蓋板的螺栓；可部分代替42CrMo和40Cr
 Ni鋼。                                                                     
                                                                           
     ●化學成份:                                                            
     碳 C : 0.17～0.23                                                      
     硅 Si: 0.17～0.37                                                      
     錳 Mn: 0.90～1.20                                                      
     硫 S : 允許殘余含量≤0.035                                             
     磷 P : 允許殘余含量≤0.035                                             
     鉻 Cr: 0.90～1.20                                                      
     鎳 Ni: 允許殘余含量≤0.030                                             
     銅 Cu: 允許殘余含量≤0.030                                             
                                                                           
     ●力學性能:                                                            
     抗拉強度      σb     (MPa):≥930(95)                                  
     屈服強度      σs     (MPa):≥735(75)                                  
     伸長率        δ5      (％):≥10                                       
     斷面收縮率    ψ       (％):≥45                                       
     沖擊功        Akv       (J):≥47                                       
     沖擊韌性值    αkv  (J/cm2):≥59(6)                                    
     硬度                       :≤187HB                                    
     試樣尺寸: 試樣毛坯尺寸為15mm                                           
                                                                           
     ●熱處理規范及金相組織:                                                
     熱處理規范: 淬火850℃,油冷;回火200℃,水冷、空冷。                      
                                                                           
     ●交貨狀態:                                                            
     以熱處理（正火、退火或高溫回火）或不熱處理狀態交貨，交貨狀態應在合同中注
 明。                         
    20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn 20CrMn