Metal sheet having low friction coefficient and low waviness

A metal sheet having a low friction coefficient and a low waviness, wherein multiple round or roughly-round pits are distributed on a surface of the metal sheet, a diameter of each of the pits ranges from 80 μm to 100 μm, and an overlap between adjacent pits is lower than 10% of an area of the adjacent pits,

• wherein on the surface of the metal sheet where the pits are located, a proportion of a surface area occupied by the pits per square millimeter ranges from 60% to 71%,
• wherein on the surface of the metal sheet where the pits are located, a difference in a number of pits per square millimeter between any two unit square millimeter areas is less than 20%, and
• wherein on the surface of the metal sheet where the pits are located, a number of pits is in a range from 90 per square millimeter to 130 per square millimeter.