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Characteristics for grade 20

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  • Characteristics for grade 20
Galvanized steel pipe specification, size theoretical weight table
February 14, 2019
Heavy Weight Drill Pipe (HWDP)
April 9, 2019

Characteristics for grade 20

     Grade :     20   ( 20 )
      Substitute:   15, 25
      Classification :   High quality structural carbon steel
   

 

Chemical composition in % for grade   20   ( 20 )

 

C Si Mn Ni S P Cr Cu As
0.17 – 0.24 0.17 – 0.37 0.35 – 0.65 max   0.3 max   0.04 max   0.035 max   0.25 max   0.3 max   0.08

 

Temperature of critical points for grade   20   ( 20 ).

 

Ac1 = 724 ,      Ac3(Acm) = 845 ,       Ar3(Arcm) = 815 ,       Ar1 = 682

 

Mechanical properties under Т=20oС for grade   20   ( 20 )

Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
– mm – MPa MPa % % kJ / m2 –
Sheet heat-treatment, GOST 4041-71 4 – 14   340-490   28      
Pipe hot strain, GOST 550-75     431 255 22 50 780  
Pipe, GOST 8731-87     412 245 21      
Pipe, GOST 10705-80     372 225 22      
Rolled stock, GOST 1050-88 to 80   410 245 25 55   Normalizing
Rolled stock cold-worked , GOST 1050-88     490   7 40    
Rolled stock annealed , GOST 1050-88     390   21 50    
Band annealed , GOST 2284-79     310-540   18      
Band cold-worked , GOST 2284-79     490-830          

 

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