“…As an exception, surface defects can be smoothed out or removed using additional surface treatment (sandblasting or shot blasting, tumbling), which will increase the quality and reliability of the finished springs (figure 4). The use of bronze alloys [1][2][3][4][5][6][7][8][9][10] in spring production is not large and amounts to no more than 500 kg per year, steel wire (rods) is many times more, but, as a rule, steel wire can be replaced with imported one, but with bronze alloys there is no such possibility. At the incoming inspection, out of 10 deliveries of bronze wire, about 5-7 deliveries are rejected, most often these are small sections from 0.5 to 3 mm and often due to cracks opening after the coiling test, on wire with a cross-section of 5 mm or more after the coiling test surface cracking and scuffing appears.…”