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material: Aluminium steel
types: 2rings and 4rings
where to put: every 3 sets of mast section
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1.The steel material selected 100 % comes from our natlonal large-scale steel corporations .
2.The critical materials that steel,welding material etc are all extramed by chemical detection , then They are allowed into workshop for batch production.
3.Strictly conforms to drawing requirements, we make the products with 16 Manganese,40 Chromium and 45#steel etc .
4.Every parts of our products that pins ,axles,sleeves etc are strictly obey quenching and tempering procedures .
5.Every parts of our products strictly conforms to the procedure requirements : mill ,plane, polish, press ,test etc in turn.
6.As for have finished products ,we perform the requirements of the ISO9001 Quality System and national standard strictly.
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