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U21702
Standard GB /T 699-1999 Quality Carbon Structural Steels
Standard GB /T 699-2015 Quality carbon structure steels
Standard GB /T 1222-2016 Spring steels


Chemical Composition(%)


Standard Material Designation Chemical Composition (%)
GB /T 699-1999
Quality Carbon Structural Steels
70Mn
(U21702)
 
Min
Max
GB /T 699-2015
Quality carbon structure steels
70Mn
(U21702)
 
Min
Max
GB /T 1222-2016
Spring steels
70Mn
(U21702)
 
Min
Max
For Reference Only