Length: 5.7m, 6.0m
Standard: EN545
Application: Potable Water / Drinking Water
Shape: Round
Hardness: ≤230HB
Pipe Wall Thickness: C40
Tensile Strength: ≥420Mpa
Yield (≥ MPa): 300 MPa
Midas supplies C40 ductile iron pipes manufactured to ISO 2531, EN 545, and EN 598. Whether your project specification calls for ductile cast iron pipe, DI pipe, spun cast ductile iron pipe, or nodular (SG) iron pipe under the C-class pressure system, Midas produces and supplies each wall thickness class from a single factory in Shanxi, China, sized from DN80 to DN2600. If your technical drawing lists a specific class C40, you can confirm the exact specification below and request a quotation directly.
Length: 5.7m,6.0m
Standard: EN545
Application: Potable Water / Drinking Water
Shape: Round
Hardness: ≤230HB
Pipe Wall Thicness: C40
Tensile Strength: ≥420Mpa
Yield (≥ MPa): 300 MPa
Material: Ductile Iron
Type: Casting
Joint Type: T-type (Push-on)
Color: Customer's Requests
Surface treatment: Customers' Request
OEM: Accept
Internal coating: Portland, Sulphate Resistant, High-Aluminum cement mortar lining
External Coating: Zinc+bitumen(70microns) painting
Delivery: In Container
Test: 100% Water Pressure Test
Packing: Bundles with steel belt/
Transportation: Bulk Vessel
Supply Ability: 10000 Ton/Tons per Month Ductile Iron Pipe
Under ISO 2531 and EN 545, ductile iron pipe is classified in two parallel systems: the K-class, based on wall thickness, and the C-class, based on the pipe's allowable working pressure. A C40 ductile iron pipe is designed for a nominal pressure rating in the 40 bar range, while C30, C25, and C20 correspond to progressively lower pressure ratings and thinner wall sections. This makes C-class pipe the specification most commonly written into water utility and EPC contract drawings when the project's design pressure — rather than a general wall-thickness index — is the governing factor.
Because C20, C25, C30, and C40 share the same external diameter for a given DN but differ in wall thickness, buyers should confirm the exact class stated in their project specification before ordering — a C25 ductile iron pipe and a C40 ductile iron pipe of the same DN are not interchangeable in a pressure-rated line. Midas manufactures all four classes in parallel, so a single order can combine different classes across a project's trunk main and branch sections if required.
| Class | Approx. Pressure Rating | Typical Application |
| C20 | Approx. 20 bar | Low-pressure distribution branches, non-critical sewage lines |
| C25 | Approx. 25 bar | Standard municipal distribution mains, irrigation lines |
| C30 | Approx. 30 bar | Medium-pressure trunk mains, industrial water supply |
| C40 | Approx. 40 bar | High-pressure trunk mains, pumping station discharge lines, elevated-head systems |
Buyers sourcing a c25 ductile iron pipe for a standard distribution main, or a c20 ductile cast iron pipe supplier for a lower-pressure branch network, will generally find the thinner-wall classes offer a lower per-meter cost while still meeting the project's design pressure — while c40 ductile iron pipe is specified where the line must withstand higher static or surge pressure, such as pumping station discharge or elevated terrain.
Municipal Water Distribution: C40 classes are commonly specified for standard distribution mains where working pressure is moderate and cost efficiency matters over long pipeline runs.
Pumping Stations & High-Head Systems: C40 ductile iron pipe is typically specified for discharge lines and sections subject to pressure surge or elevated static head.
Sewage & Drainage Networks: C40 classes, lined to EN598, are used in gravity and low-pressure sewage mains.
Industrial & Process Water: Higher classes (C40) support industrial plant piping where pressure fluctuation is more frequent.
Irrigation & Agricultural Conveyance: Lower classes (C40) are typically sufficient for gravity-fed or low-pressure irrigation trunk lines.
For our most widely specified pressure class overall, see the Ductile Iron Pipe K9 page.
What is the difference between C-class and K-class ductile iron pipe?
K-class is defined by wall thickness (e.g. K9), while C-class is defined by allowable working pressure (e.g. C40 for approximately 40 bar). Both follow ISO 2531 / EN 545 / EN 598 and are manufactured by Midas in parallel.
Do you offer OEM or private-label production for C-class ductile iron pipe?
Yes, Midas accepts OEM orders including custom coatings, markings, and project-specific specifications for buyers sourcing under their own brand or project documentation.
What documents are provided with each shipment?
Every order includes a Mill Test Certificate and hydrostatic test report; third-party inspection (e.g. SGS) can be arranged prior to shipment on request.
What is the minimum order quantity and lead time?
Lead time is approximately 45 days for first/trial orders; larger volumes are confirmed upon PO. Contact us with your required class, diameter, and quantity for an exact quotation.
Packaging Details : DN100-DN300 in bundles; DN350-DN2600 in bulk ship
Port : Tianjin
Lead Time:
| Quantity(Tons) | 1 - 1 | >1 |
| Est.Time(days) | 45 | To be negotiated |
Ductile iron pipes are suitable for municipal water supply and wastewater distribution and transportation markets, industrial and power markets, including the manufacture of treatment plants and pumping stations.
MIDAS has implemented a strict and complete quality control system, which ensures that each product can meet quality requirements of customers.Strict quality control covers every procedure, from material sourcing and processing through to testing and packing. Besides, all of our products have been strictly inspected before shipment. So far, MIDAS has manufactured 32,000,000 pieces of ductile iron pipes and there was no accident.
Superior Pressure Resistance
Midas C40 Ductile Iron Pipes are designed to withstand up to 40 bar (4000 kPa) of internal pressure, making them suitable for high-pressure water supply and drainage systems. With these pipes, buyers can be confident in their ability to handle significant pressure loads, ideal for both municipal and industrial applications.
Corrosion Resistance for Longevity
The pipes are equipped with advanced corrosion-resistant coatings, such as epoxy or zinc coatings, providing superior protection against corrosive environments. This extends the life of the pipes and reduces the need for frequent maintenance, making them a cost-effective choice for long-term use.
Durability and Strength
Manufactured from ductile iron, Midas C40 Pipes offer enhanced mechanical properties, providing greater strength, toughness, and resistance to cracking compared to traditional cast iron pipes. This ensures that they perform reliably under high stress and in challenging environments.
Midas ensures that all C40 pipes meet industry standards such as ISO 2531 and EN545, which are essential for maintaining the quality and performance of the pipes. Buyers can trust that these products have passed rigorous testing to meet international specifications.
Interested in learning more about Midas C40 Ductile Iron Pipes or ready to place an order? Contact Midas today for detailed product information, pricing, and expert assistance. Our team is here to support you with high-quality, reliable pipe solutions tailored to your needs.
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