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2AB-15型压缩机采用18-36～＃灰口铁 （ГOCT1412-48）[1]制的活塞环。为提高活塞环的耐磨性,在环的外表面涂覆一层厚135微米的铬层。 在镀铬以前环的外径要小0.27毫米。然后将这些环的锋利边缘倒45°角,以防止铬的镀层连接在相邻环的壁上。需镀铬的环表面加工到光洁度（?）-（?）（ГOCT2789-59）。根据检验测量环的缝隙来检查机械加工的质量。
2AB-15 compressor uses 18-36 ~ # gray iron (ГOCT1412-48) [1] made of piston rings. To increase the wear resistance of the piston ring, the outer surface of the ring is coated with a layer of chromium 135 microns thick. The outer diameter of the ring before ringing is smaller by 0.27 mm. The sharp edges of these rings are then inverted by 45 ° to prevent the chrome plating from attaching to the walls of adjacent rings. The surface of the ring to be chromed is machined to finish (?) - (?) (ГOCT2789-59). Check the quality of the machining according to the gap of the test ring.