Flat tube sawing blade

The utility model relates to a flat tube saw cutting blade which comprises a blade body, at least one U-shaped mounting groove is arranged at the upper end of the blade body, a knife edge is arranged at the lower end of the blade body, a cutting edge is arranged on the knife edge, the knife edge and the cutting edge are arc-shaped, the diameter of the arc where the knife edge is located is phi 1, the diameter of the arc where the cutting edge is located is phi 2, phi 1 is smaller than phi 2, and phi 2 is smaller than phi 1. Wherein phi 1 is more than 0 and less than 30mm, and phi 2 is more than 0 and less than or equal to 30mm. The cutting edge of the blade is arc-shaped, and the radian of the blade is reduced, so that the contact area between the blade and the flat tube is reduced under a certain cutting depth in the cutting process, and the problem that the cutting edge is sunken in the cutting process is solved. 本实用新型涉及一种扁管锯切刀片，包括刀片本体，所述刀片本体上端设有至少一个U型安装槽，所述刀片本体下端设有刀口，所述刀口上设有刃口，所述刀口和刃口均为圆弧形，所述刀口所在圆弧直径为Φ1，所述