الوصف

***1 SERIES aluminum alloy tubes for tent pole have good toughness, there are five steps for this craftsmanship ,the first step is heating and extruding ,the second is annealing and colding rolling ,the third step is still annealing, the fourth step is pulling , for different series ,we have different procedure, for ***1,we pulling three times then annealing, the last step is quenching and furnacing ,we also have experience workers and high technology, trust us, we never let you down.