Materials for the fabrication of silver navigation when drilling holes with a diameter D ≤ 25 mm tool steel used Y10A, Y12A, or 9XC I reached 62 ÷ 65 HRC hardness. When drilling holes with a diameter D> 25 mm, the steel used 20, 20X coal permeability with depth of 0.8 ÷ 1.2 mm and I reached 62 ÷ 65 HRC hardness.
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