Ductile iron manhole round covers

Botou tianlong casting botou tianlong casting ductile iron round covers are generally used in urban roads, because the circular covers are not easy to tilt and they can better protect the safety of pedestrians and vehicles. The application of a round cover is mainly considered that every diameter length which passes the circular center of the cover is the same; and in this case, if it is crunched up by a passing vehicle, no matter how, the diameter of the cover will always be a little wider than the manhole opening under it and the cover will not fall into the manhole opening.

Botou tianlong casting Composition of the botou tianlong casting ductile iron manhole round cover.

The pig iron is the iron and carbon alloy which contains more than 2% carbon; and the carbon content in the industrial pig iron is generally 2.5% to 4%, and it contains C, SI, Mn, S, P and other elements. It is a product smelted by a blast furnace with iron ores. According to the different forms of carbon in the pig iron, it can be divided into several kinds such as steel smelting pig iron, cast iron and botou tianlong casting ductile iron.

Precipitated graphite shows a ball shape cast iron. The splitting action of spherical graphite on the metal matrix is smaller than that of the flake graphite, so that the strength of the cast iron reaches 70 to 90% of the matrix strength; the tensile strength is up to 120kgf / mm2; and the toughness is good. botou tianlong casting ductile iron chemical composition, in addition to iron, is usually: carbon content of 3.6 to 3.8%, silicon content of 2.0 to 3.0%, the total content of manganese, phosphorus and sulfur which does not exceed 1.5% and a proper amount of rare earth and magnesium nodulizer.

Botou tianlong casting Features of botou tianlong casting ductile iron manhole round cover

Botou tianlong casting botou tianlong casting ductile iron round covers are manhole covers which mainly made of botou tianlong casting ductile iron; and the quality of it depends on spheroidization rate. The paint commonly used for the cast part is rust-proof asphalt paint and of course, botou tianlong casting ductile iron round cover of the surface is also treated by spraying rust-proof asphalt paint. botou tianlong casting ductile iron round covers have an advantage, that is, because of the high strength and good toughness of botou tianlong casting ductile iron, it is lighter by 30% than the gray cast iron cover of the same type.

Botou tianlong casting Features of botou tianlong casting ductile iron manhole round cover.

Good toughness. Impact value is similar to that of medium carbon steel is similar, which is 10 times of gray iron material.

Strong corrosion resistance. Water spray corrosion test, ninety days of corrosion is only 1/40 of the steel pipe and 1/10 of the gray iron pipe. Its service life is twice of that of the gray iron pipe and 5 times of the ordinary steel pipe.

Good plasticity. Elongation is ≥ 7%, similar to high-carbon steel, but the elongation of the gray iron material elongation is zero.

High strength. Tensile strength is ób ≥ 420MPa; yield strength is ós ≥ 300MPa, same as that of low carbon steel; and it is three times of that of the gray iron material.

In vibration reduction capacity, the botou tianlong casting ductile iron is better than that of cast steel owing to the micro-structure of nodular graphite in the botou tianlong casting ductile iron, so it is more beneficial to reduce the stress. One of the important reasons for choosing botou tianlong casting botou tianlong casting ductile iron is that botou tianlong casting ductile iron is less expensive than cast steel. The low cost of botou tianlong casting ductile iron makes this material more popular and the casting efficiency is higher, which reduces machining costs for botou tianlong casting ductile iron.

The strength of botou tianlong casting botou tianlong casting ductile iron and that of cast steel are comparable. botou tianlong casting ductile iron has a higher yield strength, the lowest of which is 40k, while the yield strength of cast steel is only 36k. In most municipal applications, such as: water, salt water, steam, etc. The corrosion resistance and oxidation resistance of botou tianlong casting ductile iron are greater than that of cast steel.

Botou tianlong casting Performance of the botou tianlong casting ductile iron manhole round cover.

Botou tianlong casting botou tianlong casting ductile iron parts have been used in almost all major industrial sectors where they require high strength, plasticity, toughness, abrasion resistance, severe heat and mechanical shock, high temperature or low temperature resistance, corrosion resistance and dimensional stability. In order to meet these conditions of use, botou tianlong casting botou tianlong casting ductile iron has many grades available, providing a wide range of mechanical and physical properties.

For example, most botou tianlong casting ductile iron parts stipulated in ISO1083 are mainly produced in non-alloy state. Obviously, this range includes high grades with tensile strength greater than 800N/mm and elongation of 2%. The other extreme is a high plastic grade with an elongation greater than 17% and the corresponding strength lower (minimum of 370N/mm). Strength and elongation are not the only basis of the designer's choice of material, and other decisive important properties include yield strength, modulus of elasticity, abrasion resistance and fatigue strength, hardness and impact properties. In addition, corrosion resistance and oxidation resistance and electromagnetic properties may be critical to the designer. In order to meet these special uses, a group of Austenitic botou tianlong casting ductile iron was developed and made, which is usually called Austenitic Ni-Resis botou tianlong casting ductile iron. These Austenitic botou tianlong casting ductile irons are alloyed mainly with zinc, chromium and manganese, which included in international standards.