Square Manhole Cover Ductile Iron EN GJS500-7 Solid Top Double Seal
Applications:
Ductile iron castings have been used in almost all major industrial
sectors, requiring high strength, ductility, toughness, wear
resistance, resistance to severe thermal and mechanical shocks,
high or low temperatures, corrosion resistance and dimensional
stability. In order to meet these variations in the conditions of
use, there are many grades of ductile iron available, providing a
wide range of mechanical properties and kinematic properties. Most
ductile iron castings, as defined by ISO 1083, are mainly produced
in non-alloyed state. Obviously, this range includes high-strength
grades with tensile strength greater than 800 Newtons/mm and
elongation of 2%. QT500-7, a general-purpose material for ductile
iron manhole covers, has a Brinell hardness of 170-230HB. The other
extreme is a high-resistance grade with an elongation of more than
17% and a correspondingly low strength (minimum of 370 N/mm scoop.
Strength and elongation are not the only roots of the designer's
choice of material, while other decisive important properties Also
included are yield strength, modulus of elasticity, wear and
fatigue strength, hardness and impact properties. In addition,
corrosion resistance and oxidation resistance and electromagnetic
properties may be critical to the designer. To meet these special
uses, a group has been developed. Austenitic ductile iron, usually
called Ni-Resis, is a ductile iron. These austenitic ductile irons
are mainly alloyed with zinc, chromium and manganese and are listed
as international standards.
Description:
From class A15 to class F900, we can totally produce them and also
produce some special covers according to customers’ asks. According
to material, Square manhole covers can be divided into four
groups-metal manhole covers, cement-based composite, Recycled resin
composite manhole cover, Polymer matrix composite manhole cover
etc. All manhole covers totally meet with EN124-2 standard, which
is widely used Global market.
Specifications:
Solid Top Manhole Cover Double Seal B/C SQUARE
Material:Ductile iron EN GJS500-7
Seal:Double |
| Item code | CLASS | Spec | External
dimensions
mm | Clear
opening
mm | Height
mm | unit weight
(kgs/set) |
| AX 3030B DS | B125 | 420x420 | 420x420 | 300x300 | 25 | 12.5 |
| AX 4545B DS | B125 | 630x630 | 630x630 | 450x450 | 50 | 36 |
| AX6060B DS | B125 | 740x740 | 740x740 | 600x600 | 40 | 41 |
| AX6060C DS | C250 | 780x780 | 780x780 | 600x600 | 50 | 59 |
Standards and features:
1. high strength. Tensile strength σs≥420MPa, yield strength
σs≥300MPa, same as low carbon steel, three times that of gray iron
2. Good toughness. The impact value is similar to that of medium
carbon steel, which is more than 10 times that of gray iron
material.
3. Good plasticity. The elongation is as large as 7%, which is
similar to high carbon steel, while the gray iron steel has an
elongation of zero.
4. Strong corrosion resistance. In the water spray corrosion test,
the corrosion amount in 90 days is only one tenth of that of the
steel pipe, which is one tenth of that of the gray iron pipe. The
service life is twice that of gray cast iron, which is 5 times that
of ordinary steel pipe.
tc.
