AASHTO M 203M/M 203-18 covers two grades of uncoated low-relaxation, seven-wire steel strand for use in pretensioned and post-tensioned prestressed concrete construction. Grade 1725 [250] and Grade 1860 [270] have minimum ultimate strengths of 1725 MPa [250 ksi] and 1860 MPa [270 ksi], respectively, based on the nominal area of the strand.