Bimetal conical twin barrel and parallel twin barrel use 38Cr Mo ALA as base, N1-30 is steel-chrome-cobalt-nickel alloy, hardness is HRC58-64, standard thickness of inside Adopting advanced workmanship, its density is much higher than usual one, and life is 2-5 times longer. The workmanship is the only one time casting in China, which is on the way of applying national alloy surface is 1.5-2mm.
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