Description features:
Our products are water-cooling metal centrifugal casting ductile cast iron pipes
such as "T" "S" "N1" types of joints with the effective length 6m; nominal diameter
ranges form DN80mm to DN2400mm, according to the standard ISO2531, 4179, 8179.The Data of Beitai Ductile Iron Pipes: (a)Standard dimensions and weight of N1 type joint (K 9 class, standard effective
length: 6m)(b) Standard dimensions and weight of S type joint (ditto)
;
(c) Standard dimensions and weight of T type joint (ditto)
;
Smelting and Molten Iron Spheroidization:
After smelting by mid-frequency furnace we treat molten iron with spheroidizing agent
to adjust its composition.Centrifugal Casting and Extracting from Molds:
On a centrifuge, water-cooled metal mould process is adopted in casting, Molten iron
in the cupola is heated by an electric furnace and after being spheroidized,
it is cast into a pipe mould turning at a high speed continuously. The molten iron
sets into a ductile iron pipe and cooled down by water then extracting from
molds according to set time strictly. Heat Treatment:
The qualified cast ductile iron pipe is put into an annealing furnace to attain the
required metallographic structure of ductile iron.Finishing:
During finishing processes, the pipes will pass through visual inspection, zinc spraying
(if necessary), roundness checking, internal grinding of spigot and socket,
hydraulic pressure testing (or air test), ring test chamfering, grinding, dimension
checking and mechanical properties test etc, in order to assure the quality
of pipes. All pipes are externally coated by metallic zinc and sprayed by bitumen
according to ISO8179.Cement Lining:
Cement mortar is lined onto the internal surface of each ductile iron pipe to prevent
water from being polluted and to increase ability of transmitting water. All
pipes are internally centrifugal lined by cement mortar lining according to ISO4179.Bitumen Coating:
To prevent corrosion and give the pipe a good look every ductile iron pipe is coated
with bituminous paint, at the same time, it is necessary to inspect external
coating quality.Price Term:
FOB, C&F, C