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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

Square Manhole Cover&Frame

Catalog NumberA-Cover SizeB-Clear OpeningC-Frame SizeD-Frame HeightE-Duty ClassF-Lockable
square manhole cover with lock650*650600*600820*820100C250yes
All dimensions in mm.

Main business: hydraulic access cover, power manhole cover cover, electric manhole cover cover, intelligent monitoring manhole cover cover, intelligent communication manhole cover cover, intelligent water manhole cover cover, intelligent password lock manhole cover cover, integrated pipe gallery manhole cover cover, etc. It is a strategic partner of famous enterprises such as Huawei, China-telecom, Unicom, Zhongshan Dahua, CSCEC, CCCC, China Railway, Xi'an electric power, and the only supplier of Hong Kong Zhuhai Macao Bridge.Our products are exported to 32 countries and regions, Italy, Spain, UK, Malaysia, Middle east, Singapore, South Korea, Japan, Australia,Africa, etc,175 cities around the world.

Founded 1993, Cast-King Foundry was a industry leader in exporting square cast iron manhole cover with lock to every continent of this earth, Just purchase directly at good price from manufacturing factory as reliable supplier, save the money usually earned by a trading company.

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 manhole cover.

More Details


Ductile manhole cover


Ductile iron GGG50/7, gray iron






Round, square, rectangle


200mm-1200mm or as per customers’   drawing


Bituminous black


DISA Line, Hand Modelling


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.Quality Guarantee

--Mechanical, chemical and microstructure test

--Test with flaw detector after rough machining

--Completed quality control system

--Long warranty time

2.Quality Document

--Mechanical, chemical and microstructure test report

--Quality Control Report

3.Packing and Shipping

--Standard export package(carton/wooden case/iron case/pallet)

--FOB, FAS, CNF,CIF,CFR, door to door, etc accepted, or customer designated shipping agent

--Prompt delivery

Computer numerical analogy consists of three parts: pre-processing, intermediate calculation and post-processing, including the establishment of geometric model, grid division, determination of solution conditions (initial and boundary conditions), numerical calculation, processing of calculation results and graphic display. The basic methods of numerical analogy are finite difference method, finite element method and boundary element method.

(1) Numerical simulation of solidification process is mainly used for heat transfer analysis of casting process. It includes the selection of numerical calculation method, the prediction and discrimination of latent heat treatment, shrinkage cavity and pick-up, and the treatment of heat transfer between casting and mold interface.

(2) Numerical analogy of flow field involves momentum, energy and mass transfer, which is very difficult. The numerical methods used are MAC method, SAMC method, sola-aof method and sola-mac method.

(3) The research on stress analogy of casting is carried out later, mainly including Heyn model, elastic-plastic model, perzyna model, unified internal variable model, etc.

(4) Organizational analogy is still in its infancy. There are three kinds of analogies: macro, meso and micro. It can calculate the nucleation number, analyze the type of primary crystal, the growth rate of dendrite, simulate the structure transformation, and predict the mechanical properties. There are deterministic models, Monte, cellular, automaton and other statistical models, phase field models, etc.

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