What is the difference between cast iron and its products?
Cast iron pipes are made of different types of this material, which is white, gray, malleable and high-strength. They are produced in different ways: sand casting, semi-continuous and centrifugal casting, centrifugal casting of De Lavo.
They are used for gravity and pressure sewerage systems, external water supply and internal sewage. Those variants that are made by the method of semicontinuous and centrifugal casting are stronger than those made by casting into a sand mold.
Cast iron elements have the following advantages and properties:
- High strength;
- High sound insulation;
- Resistance to temperature changes;
- Durability;
- Environmental safety and non-toxicity;
- High impact resistance;
- No corrosion;
- Flameproof and non-flammable;
- Low temperature elongation.
Classification of cast-iron pipes
The construction materials under consideration are divided into certain classes and types, depending on the method of their manufacture. They differ by the method of connection - with the bell and without it. The latter have a bell on the one side, and the other side is smooth. Beztrubrubnye - smooth from two sides.
Also products are divided into the field of application - pressure and non-pressure, sewage and water, oil and gas. Proceeding from this, the following types are distinguished:
- pressure iron Ductile Iron;
- cast iron pipes without socket SML;
- non-pressure chakra;
- cast iron pressure head pipes CHNR.
Brief description of various representatives of
Pipes iron Ductile Iron Pressure are manufactured by the centrifugal casting method of high-strength cast iron with nodular graphite. They are suitable for all kinds of connections. One end of them is smooth, and the other - with a bell, they can also have flanges on both sides, so they are known as pressure pig iron flanged pipes.
They are designed for sewerage and water supply systems. They are used for channel and channelless laying under the ground. Such cast-iron pipes for water supply and sewerage Ductile Iron are durable and resistant to tearing. In addition, they are plastic, and this makes it possible to withstand different diametral deflections, a considerable thickness of the soil layer and large road loads.
SML -Representatives are made by the centrifugal casting method De Lavo from gray cast iron. They are designed to organize sewage water and sewage systems in public buildings and residential buildings. They are used in external and internal engineering systems in those facilities that require increased noise protection and fire protection.
Cast iron non-pressure products are made of gray cast iron with lamellar graphite. They are coated with an anticorrosive compound based on bitumen. They have, on the one hand, a special form for connection to another pipe and its compaction. They are used for installation and internal disposal of non-pressure internal sewers.
Pipes cast iron plumbing PKP serve for the distribution of water and sewage. Their service life is about 100 years. Outdoors, they are covered with oil bitumen. A special connection makes it possible to quickly mount products.
Another type can be called cast-iron heating pipes. They are made from a gray variety of raw materials. Cast-iron ribbed pipes have flanges and rectangular ribs, which increase the heating surface and reduce heat transfer.
They are used in agricultural and communal buildings in the form of heating appliances. Products from the raw material in question are strong enough and durable. The term of their operation is about 80 years.