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    Product
    
    
  
    

    

    
    
    
     
     	 
     
     	 
     
     	 
     
    
    

    
    
          
    
                
    Q345B Square Tube
    
                
    
	 

    

    
	
    

    

    
	
    

    

    
	Implementation Standards 

    

    
	 

    

    
	  

    

    
	Seamless pipe: GB/30942000, weld pipe: GB/67282002 

    

    
	
    

    

    
	Applicable Scope 

    

    
	
    

    

    
	The
 use of square construction, machinery manufacturing, shipbuilding, 
steel construction projects, solar power support, steel structure 
engineering, power engineering, power plant, agricultural and chemical 
machinery, glass curtain wall, car chassis, airport, boiler 
construction, highway railings, housing construction, pressure vessels, 
oil tanks, bridges, power station equipment. Cranes and other high load 
welding etc.. 

    

    
	
    

    

    
	
    

    

    
	Chemical Composition 

    

    
	
    

    

    
	Q345A：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035； 

    

    
	Q345B：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.035，S≤0.035； 

    

    
	Q345C：C≤0.20，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.030，Al≥0.015； 

    

    
	Q345D：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.030，S≤0.025，Al≥0.015； 

    

    
	Q345E：C≤0.18，Mn ≤1.70，Si≤0.50，P≤0.025，S≤0.020，Al≥0.015； 

    

    
	Q345A、B、C、D、E均含Nb≤0.07，V≤0.15，Ti≤0.20，Cr≤0.30，N≤0.012，Mo≤0.10。 

    


    
	
    

    

    
	Mechanical Property

    

    
	Plain Carbon Steel
    

    
Q235 tensile strength: 375 ~ 500, yield strength is more than 235, the elongation rate: = 25
    

    
No. 20: 390 to 530, the tensile strength yield strength is more than 235, the elongation rate: = 20

    
			
    
    
    

    
    

    



    
    
    
        
    
            
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