Ductile iron castings have almost been used in all major industrial sectors, which require high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shock, high or low temperature resistance, corrosion resistance, and dimensional stability. In order to meet these changes in the conditions of use, there are many grades of ductile cast iron that provide a wide range of mechanical properties and physical properties.
Most ductile iron castings specified by the International Organization for Standardization ISO1083 are mainly produced in non-alloyed form. Obviously, this range includes high-strength grades with a tensile strength greater than 800 N/mm and an elongation rate of 2%. The other is high plasticity, its elongation is greater than 17%, and the corresponding strength is low (as low as 370 Newton/mm scoop. Strength and elongation are not just roots for the designer to choose the material, but other decisive important properties are still Including yield strength, modulus of elasticity, wear resistance and fatigue strength, hardness and impact properties. In addition, corrosion resistance, oxidation resistance, and electromagnetic properties may be critical for designers. In order to meet these special uses, a group of austenitic Bulk ductile iron, usually called NiResis ductile iron. These austenitic ductile irons are mainly alloyed with zinc, chromium and manganese and are included in the international standard.
Nodular cast iron manhole cover: It is used for outdoor manholes in industrial and civil construction areas. It can be used to pave road slag, marble and granite in high-end residential areas. All products can open the slab cover. It can be used for water supply and drainage wells, ventilation wells, cable wells, meter wells, etc. It is composed of well frames and well covers. At the same time, its strength and toughness are much higher than that of cast iron, and it can also be used in large-span and heavy-load environments such as docks and airports; many of this product is also used in ductile iron garden manhole covers. The shape includes ductile iron round manhole covers and ductile iron. Square manhole cover
The new invisible manhole cover is composed of a well frame and a manhole cover. The manhole cover is designed as a square groove. The profile can also be inverted trapezoid, which can make the manhole cover and the well frame more closely fit, and improve the current deficiencies of the manhole cover. The invisible manhole cover only exposes the four sides of the frame on the ground surface. The middle of the manhole cover is recessed to a certain depth, and the bottom of the concave surface is designed as an arc. Shape, nodular cast iron manhole cover classification standard concave surface with reinforcing ribs. The light invisible manhole cover is a steel plate structure, and the surface can be directly covered with floor tiles.
Customized according to customer needs.
ductile iron manhole cover is composed of well frame and manhole cover. The manhole cover is designed as a square groove. The profile can also be inverted trapezoid, which can make the manhole cover and the well frame more closely fit, and improve the current deficiencies of the manhole cover. The invisible manhole cover only exposes the four sides of the frame on the ground surface. The middle of the manhole cover is recessed to a certain depth, and the bottom of the concave surface is designed as an arc. Shape, with reinforcing ribs on the concave surface. The light invisible manhole cover is a steel plate structure, and the surface can be directly covered with floor tiles. Customized according to customer needs.
Nodular cast iron invisible manhole cover purchase notice: This kind of product is a customized product and is not available from stock. Customers in need please provide detailed specifications and requirements descriptions or drawings of the product, and our factory produces 1:1 according to the requirements. The marked price is not the actual unit price of the product. The unit price of products of different specifications is different. Please communicate with our online customer service to confirm the data.
payment. In order to avoid the wrong payment amount, affecting the production cycle. The very exquisite ductile cast iron invisible manhole cover, with thick materials and exquisite workmanship, makes people look like a work of art, far beyond the scope of the manhole cover. Most ductile iron manhole covers are called ductile iron decorative manhole covers for a profound reason. Quality Assurance Purchase directly from regular manufacturers, supply strictly according to the quality standards required by users, and be responsible for the quality to the end, and return, replace, and compensate for inconsistent materials.
Inspection manhole cover clear width JK (mm) Support bearing surface width b (mm)
≥600 ≥20
＜600 ≥15
The embedding depth of the manhole cover. The heavy inspection manhole cover should not be less than 40mm, and the light inspection manhole cover should not be less than 30mm.
The surface of the well cover should have a convex height not less than 3mm.
The surface of the well cover and the support should be cast flat and smooth. There must be no cracks, cold partitions, shrinkage and other defects that affect the performance of the inspection well cover. No repair welding is allowed.
The size of the assembly structure of the well cover and the support shall meet the requirements of GB6414. The tolerances should not be lower than the provisions of GB6414-86 CT10 and ensure the interchangeability of the manhole cover and the support.
The contact surface of the manhole cover and the support surface should be machined to ensure the smooth contact between the manhole cover and the support
