Graphite of nodular cast iron
pipe fittings exist in spherical method does not affect the substrate materials and mechanical function, in the low pressure pipe, ductile pipe
is safe and reliable work, antiseptic function.
Buried pipelines carrying load end by end of backfill ductile cast iron pipe materials, this is a particularly about flexible, plastic pipe especially soil function together to compensate for the lack of rigidity, ductile iron pipe material is round billet, round tube embryos to cut through the boot cut processing for more than 1 m billet growth degree, and the conveyor belt to the heating furnace.
Billet are fed into the furnace heating, generally is one of the more common conical roll piercer, the fruit punch with high efficiency, products of good quality and large amount of perforated hole enlargement, can wear a variety of steel grade.
After perforation, circular tube billet has been three-roll skew rolling, rolling and kneading.
To take off the tube sizing after kneading.
Sizing mill by cone bit rotation into the steel embryo punch, constitute a steel tube.
Ductile iron pipe diameter by sizing mill bit diameter length to determine.
Steel pipe in steel pipe after sizing, into the cooling tower after cooling will be straightening.
Steel pipe after straightening the internal inspection shall be conducted by pass metal detection machine.
Ductile iron pipes in rare earth magnesium magnesium), or contact golden agent before pouring in molten iron, the graphite spheroidizing, make the pipe strength, corrosion resistance, good sealing and other interests;
Its internal use of cement mortar cloth, improve the environment, improve the water supply pipeline capacity, reduce the energy consumption;
Nozzle chose flexible interface, and the pipe itself has a larger elongation, better make of flexible pipe, in buried pipeline and soil around the pipeline work, improve the stress of the pipeline, and then improve the reliability of the network.
Therefore, at present, the water supply profession choose nodular cast iron pipe material as a supervisor.
Ductile iron pipe anticorrosion sex and safety directly.
Ductile iron pipe pile requirements: 1, the principle of stacking requirement is under the condition of the pallet solid, ensure safety, do pallet according to the varieties, specifications, variety of materials to pallet respectively, to prevent confusion and corrosion.
2, banned the crib near a store items have a corrosion effect on steel.
3, pile bottom should be higher, and solid, smooth, prevent the material to be affected with damp be affected with damp or deformation.
4, the same material in warehouse stacking respectively, ductile cast iron pipe is easy to implement the principle of advanced starts.
5, open-air stack section, the following must be wood or stone, crib face slightly tilted, and to facilitate drainage, and pay attention to material placed flat, prevent caused by bending deformation.
6, stacking height, artificial homework no more than 1.
No more than 1 of 2 m, machinery operation.
5 m, crib width less than 2.
7, between pile and pile should have certain channels, ductile iron pipe inspection is commonly 0.
5 m, access depends on the material size and transport machinery, general is 1.
5 ~ 2.
8, pile bottom cushion is high, if the warehouse to the cement ground in chaoyang, padding 0.
If you for mud, you must pad high 0.
2 to 0.
If the open area, cement floor mat high 0.
3 to 0.
5 m, sand and mud surface mat high 0.
5 to 0.
Ductile iron pipe fittings test methods of 1, tensile test of tensile strength according to the provisions of GB 228.
2, ductile iron pipe fitting surface and coating quality by visual inspection.
3, ductile iron pipe tightness test should be performed before coating, e. , when the stress reaches pressure holding time shall not be less than 10 s, at this point not leak of flooding.
4, the size of the ductile iron pipe fittings can be measured with a caliper and other specialized measuring.
5, hydraulic test should be performed before coating, e. , when the stress reaches pressure holding time shall not be less than 10 s, there shall not be leakage at this time.
6, nodular cast iron tube hardness test according to the provisions of GB231.
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