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Coated gun drill
Coated tool has characteristics as high surface hardness, good abrasion performance,stable chemical properties,small friction factor and lower themal conductivity,etc.The cutting performance is 30% higher than non-coated tool. Promomte grade 0.5-1 of processing accuracy. Prolong the gun drill's service life and than non-20%-50% of tool's consumption cost. The normal coating contains TIN,TiAN titanium based coating and AICrN chromium coating,etc
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