天津Cr5Mo合金管
    1Cr5Mo的焊接：  
    焊接性能差。焊前预热至400-450度并经850度高温回火。电焊用热507或奥307焊条。自动焊用HCr5Mo焊丝和焊剂260.  
    用途：  
    用于石油工业热交换器、锅炉吊架等。最高使用温度在650度以下。  
    化学成分（%）  
                                                                                    技术条件                      
                                            GB1221-92                      
                                                                            C                      
                                                                            Si                      
                                                                            Mn                      
                                                                            S                      
                                                                            P                      
                                                                            Cr                      
                                                                            Mo                      
                                                                                                    ≤0.15                      
                                                                            ≤0.5                      
                                                                            ≤0.6                      
                                                                            ≤0.03                      
                                                                            ≤0.035                      
                                                                            4.0-6.0                      
                                                                            ≤0.6                      
                                                                                                    Ni                      
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                                                                                    0.45-0.6                      
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                                                                                
                                        
    力学性能：  
                                                                                    技术条件                      
                                                                            σs，Mpa                      
                                                                            σb,Mpa                      
                                                                            δ5,%                      
                                                                            Ψ,%                      
                                                                            akv,j/cm2                      
                                                                            HB                      
                                                                                                    GB1221-92                      
                                                                            ≥392                      
                                                                            ≥588                      
                                                                            ≥18                      
                                                                                                
                                                                                                
                                                                            ≤200                      
                                        
    
      
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