Manhole Cover B125, C250, D400 Made in China

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1,Cast Iron Manhole Cover Description :

manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

Manhole covers are often made out of cast iron, concrete or a combination of the two. This makes them inexpensive, strong, and heavy, usually weighing more than 50 kilograms (110 lb). The weight helps to keep them in place when traffic passes over them, and makes it difficult for unauthorised people not having suitable tools to remove them.

A manhole cover sits on metal base, with a smaller inset rim which fits the cover. The base and cover are sometimes called "castings", because they are usually made by a casting process, typically sand-casting techniques.


2,Main Features of the Ductile Iron Manhole Cover:

·High endurance

·High Strength

·Pressure Resistence



·Good visual effect

3,Manhole Cover Specifications:

1) Production information
Manhole cover are manufactured for construction and public use. Manhole cover shall be smooth and free sand holes, blow holes, distortion or any other defects 

2) Material
A) Ductile iron GGG50

B) Grey iron GG20
3) Designs
A) EN124 Class B125 C250 D400 F 900, with different size and grammage, or as  customers' requirement.
B) as per customers' drawing or samples
4) Process
A) Molding boards

B) Hand Casting 

5) Coating
A) black bitumen or epoxy .
B)Coating as per customer's requirement

6) Different accessories are available 

7) Packing:
Wooden case or wood pallet, or as per customers' requirement 

8)  Payment terms: T/T or L/C 


A)Inspection by our factory

B)The third party inspection,SGS


We have organized several common questions for our clientsmay help you sincerely

Q. Can I fit a square manhole cover into a round chamber?

A. Yes, there are a select few manhole covers which are square-to-round, meaning they will fit square or round chambers. 

Q. I have a heavy traffic manhole cover but it has been broken by a forklift, why?

A. Forklifts have solid wheels which apply pressure differently to standard pneumatics and therefore covers must be specially adapted to suit this.


Q. I’ve measured my clear opening size but none of your covers match it, can you offer anything?

A. It’s likely that your cover is quite old and in imperial measurements which are no longer manufactured. However, we can offer bespoke solutions with manhole covers made to the specification you require.


Q. The project I’m working on requires a manhole cover with a quality finish, what’s available?

A. Naturally, galvanised steel of black polypropylene aren’t always ideal, and so we offer brass or stainless steel edging, as well as complete stainless steel covers.


Q. Odours are coming through where I have installed my manhole cover, why?

A. Your cover must be sealed and locked, or neoprene sealed, so you would require a T-Range Cover, or if you require a solid top, a selection of the PC range (e.g. PC2BG3, PC6CG3, not PC2BG) are suitable.


Q. I need access through my manhole cover on a regular basis, is this possible?

A. Yes, the majority of covers have built-in lifting keys, and for those that don’t we also supply lifting keys. However, the best way to obtain easy access is to have a bespoke, hinged manhole cover. 

5,Manhole Cover Images:


Manhole Cover  B125, C250, D400 Made in China

Manhole Cover  B125, C250, D400 Made in China

Manhole Cover  B125, C250, D400 Made in China

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Q:chemical difference between metals and non metals?
Power metal: Fantasy based metal genre that usually tells a story or a meaning in a song. In my opinion, Power metal sings more about warrior killing the dragon/medieval folklore and has more of an uplifting beat to the story it's portraying. The song Phantom lord does sing about that kind of topic, but the rhythm itself doesn't have anything to do with the power metal genre. here the battle roar, louder then before, with your sword in hand, you'll control the land those lyrics are what I'm guessing gave you the impression that it was power metal related. but, it's not. would it be an influence........ yeah I guess you could say that. Early thrash metal bands would have an influence on power metal bands such as Riot in the late years and I would say even iron maiden even though iron maiden isn't thrash metal was a bigger influence, since they had albums dedicated to a certain topics that power metal would be based on. Powerslave for example! but besides thrash metal... Black metal would be a huge influence as well. Why? because, black metal usually revolves around a more satanic/Demonic topic which has a lot to do with power metal topics. An example of this would be Angra - Unholy wars or Edguy - Mysteria. I hope this helps. and to answer your other questions: Q: Cronos of venom said he considers venom in the genre of power metal do you agree? A: well... songs such as bloodlust or cry wolf would sound like a power metal type of song but, no. I wouldn't consider Venom power metal at all. Q:Was king diamond an influence on power metal vocalists? A: YES! King diamond has an amazing ability to tell whats going on with multiple people at once in one song, and tell a story at the same time. An example would be King diamond - Am I evil or King diamond - Abigail album. Keep on truckin brother. m/
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Metals do become brittle - depending on their thermal history. Generally speaking, the harder a metal is, the more brittle it is. Some examples of brittle metals: Iridium, Bismuth, and man made Plutonium (Pu). Similar to most substances, metals solidify as many separate crystals. The line where two or more crystals touch is called the grain boundary. If the grain boundary is weaker than the crystals themselves, then a crack can easily propagate through this boundary and fractures occur. If the metal is treated in such a way so that many multiple crystals form simultaneously (as when the metal is heated to an extremely high temperature and then cooled rapidly), then multiple, interconnected grain boundaries form and an impact with a high enough force can cause these boundaries to break apart making the metal appear to have shattered.
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