Precision tubes are delivered in following conditions
BK (+C) Cold finished/hard (cold finished as drawn). No heat treatment after last cold forming process. BKW (+LC) Cold finished/soft (lightly cold worked). After last heat treatment there is a light finishing pass (cold drawing). BKS (+SR) Cold finished/stress relieve annealed. After the final cold forming process the tubes are stress relieve annealed. GBK (+A) Annealed. After the final cold forming process the tubes are annealed in a controlled atmosphere. NBK (+N) Normalized. After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.
Tests: 100% eddy current test, chemical and mechanical inspection, size checking and others
Chewit international Located in zhangjiagang city which is along The Yangtze Golden Channel the junction of River and Coast Economic Belt. It owns an excellent geographic position, as it is close to Nanjing city in the north, adjacent to Suzhou and Wuxi cities in the south, next to Shanghai international city in the east. Zhangjiagang international port and State highway endow us a convenient water and land transportation which links us to the outside ... View detail