Figures 7 and 8 show the relationships between the tensile stress and strain of the CP-Ti strip for grinding pit depths of 0.25 mm, 0.5 mm, and 0.75 mm, respectively, during the fifirst-pass rolling interval. The RD stress at the bottom of the 0.25 mm pit did not reach the tensile strength (312 MPa) of the material, so it did not break after the fifirst pass (fracture condition 1: reaching the breaking strength limit; 2: reaching the elongation limit).

Figures 7 and 8 show the relationships between the tensile stress and strain of the CP-Ti strip for grinding pit depths of 0.25 mm, 0.5 mm, and 0.75 mm, respectively, during the fifirst-pass rolling interval. The RD stress at the bottom of the 0.25 mm pit did not reach the tensile strength (312 MPa) of the material, so it did not break after the fifirst pass (fracture condition 1: reaching the breaking strength limit; 2: reaching the elongation limit).