27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格
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27SiMn (GB/T 3077-1988)   
     ●特性及适用范围:                                                      
     性能优于 30Mn2钢，淬透性高。用作高韧性和耐磨性的热冲击零件，用作截面＜30
 mm的零件时，可代替 25Ni3钢；也可用于不经热处理的零件；或在正火后应用，如拖拉
 机的履带销等。                                                             
                                                                           
     ●化学成份:                                                            
     碳 C : 0.24～0.32                                                      
     硅 Si: 1.10～1.40                                                      
     锰 Mn: 1.10～1.40                                                      
     硫 S : 允许残余含量≤0.35                                              
     磷 P : 允许残余含量≤0.35                                              
     铬 Cr: 允许残余含量≤0.30                                              
     镍 Ni: 允许残余含量≤0.30                                              
     铜 Cu: 允许残余含量≤0.30                                              
                                                                           
     ●力学性能:                                                            
     抗拉强度      σb     (MPa):≥980(100)                                 
     屈服强度      σs     (MPa):≥835(85)                                  
     伸长率        δ5      (％):≥12                                       
     断面收缩率    ψ       (％):≥40                                       
     冲击功        Akv       (J):≥39                                       
     冲击韧性值    αkv  (J/cm2):≥49(5)                                    
     硬度                       :≤217HB                                    
     试样尺寸: 试样毛坯尺寸为25mm                                           
                                                                           
     ●热处理规范及金相组织:                                                
     热处理规范: 淬火920℃,水冷；回火450℃,水冷、油冷。                     
                                                                           
     ●交货状态:                                                            
     以热处理（正火、退火或高温回火）或不热处理状态交货，交货状态应在合同中注
 明。                  
27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格27SiMn价格