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  1. Email :
  2. Tel : +86-15116381985
  3. Add : Headquater Address : No.12, Dongshi Road, Changsha Economic Development Zone, Changsha, Hunan Province, China
  4. Foundry Address : Foundry Address: NO.260,Jinchang Road,Jinjing Town,Changsha,Hunan Province,China

Round Manhole Cover&Frame

Catalog NumberA-Cover SizeB-Clear OpeningC-Frame SizeD-Frame HeightE-Duty ClassF-Lockable
port used E600 ducitle iron manhole cover700650900105E600yes
All dimensions in mm.

Founded 1993 in China, Cast-King Foundry was a industry leader in exporting port used E600 ducitle iron manhole cover to every continent of the earth, Just purchase directly at good price from manufacturing factory as reliable supplier, save the money usually earned by a trading company

Our main market includ Italy, Spain, UK, Malaysia, Middle east, Singapore, South Korea, Japan, Australia,Africa, etc.

OEM & OED is available, look forward to having you as your agent in your local market.

We would push you to great success in municipal construction and infrascture project.

Look forward to being partner with those who are engaged in whole sale business for building material, any customized high quality mechanical and industrial casting are prvovided by us as well.



Ductile   manhole cover


Ductile iron   GGG50/7, gray iron






Round, square,   rectangle


200mm-1000mm   or as per customers’ drawing


Bituminous   black




Drawing-mould   making-raw casting-sand blasting-rough machining-surface treatment-product   inspection

Advanced   technology and equipments

Tensile strength: 500Mpa Yield stress: 320Mpa
  Elongation rate: 7%
  Hardness: HBS170-230

Load capacity

B125 C250 D400   E600 F900


Machining:+/-0.02mm,   finish machining:0.002mm


Footway,   pedestrians, car parks, aircraft pavements


Longevity   corrosion resistance, excellent anti-pressure


1. Why are most manhole covers round?

 Manhole covers are round because a round cover cannot fall through its circular opening. The manhole cover rests on the frame seat; therefore, the diameter of the frame opening is smaller than the manhole cover. Whereas a square or rectangular manhole cover may fall through an opening if turned diagonally in the hole. It is also easier to dig a circular hole. Round covers are easier to machine on a lathe. A round manhole cover can be rolled, which makes it easier to move if needed.

2.     Why ductile iron?

Spheroid Graphite' or 'Ductile Iron' is a unique form of Iron. which prior to the metal casting process receives crucial mineral additives to produce an exceptionally strong resistance and durable metal, the molecular structure of 'Ductile Iron' gives rise to excellent additional strength and shock load resistance, within structure carbon steel, without steel inheriting corrosion. In today's roads, Covers & Gratings are required to carry increasingly heavy and fast moving traffic, yet the need to keep the roads in service, places free from accidents and theft, additional demands on those Covers and Gratings in terms of speed and ease of access for maintenance of services is essential. 'Ductile Iron' Manhole Covers, Gratings and Frames are fast replacing the conventional 'Grey Iron Manhole Covers, Gratings and Frames on account of uniqueness in its Strength to Weight ratio, Design, Weight and the Cost benefit.

casting process web use.jpg

Any Customized Model is available from us

Any question, please feel free to contact us
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Hunan Castking Foundry Technology Co.,Ltd