Ductile iron covers specifications: heavy 400KN, type 250KN, light 125KN; bending strength: average 22MPa impact strength: average 10J / m2; compression strength: average 25MPa; tensile strength: average 10MPa; elastic modulus: average Value 1000MPa; water absorption: 1%; acid resistance: the sample in 20% sulfuric acid solution soak 48h.

Surface without corrosion, loss of quality 1%.

Heavy Ductile Iron Manhole Cover Test Load 400KN, corrosion resistance, aging resistance, acid and alkali resistance, toughness, long life, high bearing capacity, easy deformation, good safety.

Heavy duty ductile iron double bed well covers bearing more than 360kN or super steam -20 main vehicle. Compliance with the industry standard rules for "cast iron inspection covers" (heavy manhole covers 360KN, light covers 210KN.)

Heavy Ductile Iron Manhole Cover Features:

1, long life: corrosion-resistant, non-polluting, maintenance-free, you can use more than 50 years.

2, high bearing capacity: carrying capacity far more than other types of products, carrying pressure, anti-fracture, vehicle crash and other security incidents.

3, anti-theft: general anti-theft design, new anti-theft design, covers and well-ring with high-strength bolts, one design.

4, anti-jump cover: the use of shock ring, making the vehicle through no noise, in line with environmental requirements.

5, good security: well covers tight, does not produce jump, rocker, ring, shift and other phenomena, no noise, safe and reliable.

6, beautiful: beautify the urban environment, spray black asphalt, so that the appearance of bright products, clean and tidy.

7, non-slip: covers the surface of a special anti-skid pattern, increase friction, to prevent rain, snow, ice cover so that pedestrians slipped.