The Class K7 DN600 ductile iron pipe (600mm diameter, 7-bar pressure rating) delivers exceptional strength (420 MPa tensile) and corrosion resistance for large-scale water and industrial systems.
Application Scenarios
Municipal Water Distribution
Class K7 DN600 mains form the backbone of city and regional water networks, delivering steady flows with minimal leakage in systems requiring large diameters.
Sewage & Wastewater
Its resistance to abrasive and chemically aggressive effluents makes Class K7 pipes ideal for sanitary and stormwater sewers, maintaining structural integrity under heavy solids‑laden flows.
Industrial Process Lines
Power plants, manufacturing facilities and chemical plants leverage DN600 DI for raw‑water intake, cooling‑water loops and process pipelines, benefiting from high mechanical strength and corrosion resistance.
Agricultural Irrigation
Large‑bore mains transport high‑volume irrigation flows across vast farmlands, with ductility that accommodates soil movement and thermal cycles without cracking.
Service Life
Modern ductile iron mains routinely achieve service lives beyond 100 years under normal operating conditions, driven by robust cement‑mortar linings and durable external coatings. Internal linings of Portland or sulphate‑resistant cement, paired with bitumen or zinc‑aluminum exterior coatings, minimize corrosion and maintenance needs over decades.
Installation & Connection
Joint Methods
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Push‑On (Tyton®): Simple, gasket‑sealed joint providing reliable, quick assembly—ideal for standard buried installations.
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Mechanical Joint: Bell, gland and bolt system offering restrained performance where thrust blocks are impractical.
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Flange Joint: Full‑face sealing for above‑ground runs or sections requiring frequent disassembly.
Trenching & Encasement
Pipes rest on well‑graded granular bedding; backfill is placed in layers and compacted to prevent settlement. In corrosive soils, polyethylene encasement (Methods A/B/C) adds external corrosion protection.
International Standards
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ISO 2531 / EN 545/598 define materials, dimensions, tolerances, mechanical properties and lining/coating requirements for DN80–DN2600 pipes.
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ANSI/AWWA C151/A21.51 covers 3″–64″ (80–1600 mm) DI pipes for potable, raw and wastewater, specifying casting, dimensions, coatings and joint types.
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Certifications: Many producers hold ISO 9001, ISO 14001, NSF and WRAS approvals, ensuring consistent production quality and potability compliance.
Price Comparison with Other Classes
| Class | Wall Thickness (mm) | Price (USD/ton) | Approx. Price (USD/m)¹ |
|---|---|---|---|
| K7 | 6.0 | 460 – 500 | 60 – 75 |
| K8 | 6.8 | 480 – 560 | 65 – 85 |
| K9 | 8.0 – 9.0 | 500 – 600 | 70 – 100 |
¹ Based on average weight 150–180 kg/m.
Advantages
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High Corrosion Resistance: Internal cement‑mortar lining and epoxy/bitumen or zinc‑aluminum external coatings virtually eliminate corrosion.
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Excellent Impact Strength: Tested per ANSI/AWWA C151, DI pipes withstand water hammer, traffic loads and handling shocks.
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Structural Flexibility: Ductility allows pipes to flex under soil shifts and seismic activity without fracturing.
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Sustainability: Made with high recycled‑content iron and fully recyclable at end‑of‑life, supporting circular‑economy goals.
FAQs
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What does DN600 mean?
It denotes a nominal diameter of 600 mm; actual internal diameter may vary by class and lining. -
What is Class K7?
A pressure rating of 7 bar working pressure with minimum tensile strength of 420 MPa and ≥ 10% elongation at break. -
How long will the pipe last?
Modern DI mains exceed 100 years of service in potable and raw water applications. -
What joint options are available?
Push‑on (Tyton®), mechanical and flange joints—selected based on thrust, maintenance and installation needs. -
Is ductile iron pipe environmentally friendly?
Yes—high recycled content, energy savings during service and 100% recyclability at end‑of‑life.
Case Studies
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Eastern Terrace Watermain Upgrade (New Zealand): Installation of 2 455 m of DN600 DI mains improved supply reliability and reduced leakage rates for a suburban network.
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Global Utility Projects (DIPRA): Case studies from cities worldwide demonstrate DI mains’ ease of installation, low maintenance and predictable lifecycle costs
ductile iron pipe dimensions
| Pipe body weight （kg/m) | |||||||||||||||
| (Inside Diameter) | (Outside Diameter) | Socket Weight | K8 | K9 | K10 | C class | Total weight of Active Length=6M (kg) | Total weight of Active Length=5.7M (kg) | |||||||
| DN(mm) | OD(mm) | ≈ kg | Class | kg/m | K8 | K9 | K10 | C class | K8 | K9 | K10 | C class | |||
| 80 | 98 | 3.40 | 12.20 | 12.20 | 12.20 | C40 | 9.10 | 77.00 | 77.00 | 77.00 | 58.00 | 73.00 | 73.00 | 73.00 | 55.00 |
| 100 | 118 | 4.30 | 14.90 | 15.10 | 15.10 | C40 | 11.12 | 93.70 | 95.00 | 95.00 | 71.00 | 90.00 | 91.00 | 90.00 | 68.00 |
| 125 | 144 | 5.70 | 18.90 | C40 | 119.00 | ||||||||||
| 150 | 170 | 7.10 | 21.80 | 22.80 | 22.80 | C40 | 16.48 | 138.00 | 144.00 | 144.00 | 106.00 | 132.00 | 138.00 | 137.00 | 101.00 |
| 200 | 222 | 10.30 | 28.70 | 30.60 | 30.60 | C40 | 22.62 | 183.00 | 194.00 | 194.00 | 146.00 | 174.00 | 185.00 | 185.00 | 139.00 |
| 250 | 274 | 14.20 | 35.60 | 40.20 | 44.30 | C40 | 32.63 | 228.00 | 255.00 | 280.00 | 210.00 | 218.00 | 244.00 | 267.00 | 200.00 |
| 300 | 326 | 18.90 | 45.30 | 50.80 | 56.30 | C30 | 43.90 | 290.00 | 323.00 | 357.00 | 282.00 | 278.00 | 309.00 | 340.00 | 269.00 |
| 350 | 378 | 23.70 | 55.90 | 63.20 | 69.60 | C30 | 51.88 | 359.00 | 403.00 | 441.00 | 335.00 | 343.00 | 384.00 | 420.00 | 319.00 |
| 400 | 429 | 29.50 | 67.30 | 75.50 | 83.70 | C30 | 60.78 | 433.00 | 482.00 | 532.00 | 394.00 | 414.00 | 460.00 | 506.00 | 376.00 |
| 450 | 480 | 38.30 | 80.00 | 89.30 | 99.00 | C30 | 73.30 | 515.00 | 575.00 | 632.00 | 472.00 | 492.00 | 550.00 | 597.00 | 450.00 |
| 500 | 532 | 42.80 | 92.80 | 104.30 | 115.60 | C30 | 87.20 | 600.00 | 669.00 | 736.00 | 566.00 | 572.00 | 638.00 | 702.00 | 540.00 |
| 600 | 635 | 59.30 | 122.00 | 137.30 | 152.00 | C30 | 120.62 | 791.00 | 882.00 | 971.00 | 783.00 | 755.00 | 842.00 | 926.00 | 747.00 |
| 700 | 738 | 79.10 | 155.00 | 173.90 | 193.00 | C25 | 142.15 | 1009.00 | 1123.00 | 1237.00 | 932.00 | 963.00 | 1071.00 | 1179.00 | 889.00 |
| 800 | 842 | 102.60 | 192.00 | 215.20 | 239.00 | C25 | 177.07 | 1255.00 | 1394.00 | 1537.00 | 1165.00 | 1197.00 | 1330.00 | 1465.00 | 1112.00 |
| 900 | 945 | 129.60 | 232.00 | 260.20 | 289.00 | C25 | 197.68 | 1521.00 | 1691.00 | 1863.00 | 1446.00 | 1452.00 | 1613.00 | 1777.00 | 1257.00 |
| 1000 | 1048 | 161.30 | 275.00 | 309.30 | 343.20 | C25 | 266.28 | 1811.00 | 2017.00 | 2221.00 | 1759.00 | 1729.00 | 1925.00 | 2118.00 | 1679.00 |
| 1100 | 1152 | 194.70 | 362.80 | 2372.00 | |||||||||||
| 1200 | 1255 | 237.70 | 374.00 | 420.10 | 466.10 | C25 | 373.88 | 2482.00 | 2758.00 | 3034.00 | 2481.00 | 2370.00 | 2632.00 | 2894.00 | 2369.00 |
| 1400 | 1462 | 279.30 | 547.20 | 3563.00 | |||||||||||
ductile iron pipe Mechanical property
| Mechanical Property | |||||||
| Nominal Diameter | Hydraulic test | Tensile strength | Elogation | Yield strength | Bending strength | Brinell hardness | Thickness of cement lining |
| DN(MM) | Mpa | Mpa | % | Mpa | Mpa | HB | mm |
| DN80-DN300 | 5 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 3 |
| DN350-DN600 | 4 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 5 |
| DN700-DN1000 | 3.2 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 6 |
| DN1100-DN1600 | 2.5 | ≥420 | ≥7 | ≥300 | ≥590 | ≤230 | ….. |
