Welcome to ALLLAND Steel Pipe Co., Ltd.
Welcome to ALLLAND Steel Pipe Co., Ltd.
ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing.Chromium Carbide Overlay Pipe (CCO Pipe) is a heavy-duty wear resistant pipe designed for severe abrasion environments. It features a chromium carbide alloy overlay layer bonded to a steel base pipe, providing outstanding abrasion resistance, structural strength, and extended service life. CCO Pipe is widely used in mining, cement, steel, power generation, and slurry transportation systems.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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Chromium Carbide Overlay Pipe (CCO Pipe), also known as chromium carbide wear pipe or hardfaced wear pipe, is a high-performance composite pipe designed for severe abrasion applications.
It is manufactured by depositing a chromium carbide alloy layer onto the surface of a carbon steel or low alloy steel pipe through welding technology. The composite structure combines:
O.D.:
50 mm – 1200 mm
Pipe Type:
Seamless / ERW / LSAW / Fabricated Pipe
Length:
1 m – 6 m (Standard Pipe Length), available in fixed or multiple lengths; custom lengths per project requirements.
W.T.:
Base Pipe Wall Thickness 3 mm – 30 mm
Overlay Thickness 3 mm – 15 mm
Total Wall Thickness 6 mm – 45 mm
Base Material:
Carbon Steel / Low Alloy Steel
Overlay Layer:
Chromium Carbide Alloy
Overlay Thickness:
3–12 mm
Temperature Resistance:
Up to 350–650℃ (depending on grade)
A typical CCO Pipe consists of three functional zones:
——————————–
Chromium Carbide Overlay Layer
(Main Wear Protection Layer)
——————————–
Bonding / Dilution Zone
(Metallurgical Connection)
——————————–
Carbon Steel Base Pipe
(Structural Support)
——————————–
The overlay layer is a high chromium alloy containing hard chromium carbide particles, mainly Cr₇C₃ carbide, which provides outstanding resistance against abrasive wear.
| Element | Function |
| Chromium (Cr) | Forms high hardness chromium carbide particles |
| Carbon (C) | Combines with chromium to form Cr₇C₃ carbides |
| Manganese (Mn) | Improves toughness and weldability |
| Silicon (Si) | Enhances welding performance |
| Element | Typical Content |
| C | 4–6% |
| Cr | 20–35% |
| Mn | 1–3% |
| Si | 0.5–1% |
The exact chemical composition depends on the required wear resistance level and manufacturing process.
| Item | Value |
| Surface Hardness | 55–65 HRC |
| Carbide Hardness | 1500–3000 HV |
| Overlay Thickness | 3–12 mm |
| Temperature Resistance | Up to 350–650℃ (depending on grade) |
| Base Pipe Material | Carbon Steel / Low Alloy Steel |
Some commercial CCO pipes achieve surface hardness of approximately 59–62 HRC, depending on alloy composition and welding process.
CCO Pipe dimensions are usually customized according to project requirements, operating conditions, and installation methods.
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Base Wall Thickness (mm) | Overlay Thickness (mm) |
| 2″ | 60.3 | 3.9–6.0 | 3–6 |
| 3″ | 88.9 | 5.5–8.0 | 3–8 |
| 4″ | 114.3 | 6.0–10.0 | 3–8 |
| 6″ | 168.3 | 7.1–12.0 | 4–10 |
| 8″ | 219.1 | 8.0–15.0 | 4–10 |
| 10″ | 273.0 | 8.0–18.0 | 5–12 |
| 12″ | 323.9 | 10.0–20.0 | 5–12 |
| 14″ | 355.6 | 10.0–22.0 | 5–12 |
| 16″ | 406.4 | 12.0–25.0 | 5–12 |
| 18″ | 457.0 | 12.0–25.0 | 6–15 |
| 20″ | 508.0 | 14.0–30.0 | 6–15 |
| 24″ | 610.0 | 16.0–30.0 | 6–15 |
| 30″ | 762.0 | 18.0–35.0 | 8–15 |
| 36″ | 914.0 | 20.0–40.0 | 8–15 |
| 42″ | 1067.0 | 25.0–45.0 | 8–15 |
| 48″ | 1219.0 | 25.0–50.0 | 10–15 |
Typical manufacturing process:
Step 1: Base Pipe Preparation
Suitable base pipes include:
Step 2: Overlay Welding
Methods used:
Chromium-carbon alloy welding wire is deposited onto the steel pipe surface.
Typically:
The number of layers determines the wear-resistant service life.
Step 3：Cooling & Inspection
After welding, pipes undergo:
CCO Pipe is designed to resist three major types of wear:
①Sliding Abrasion
Typical applications:
The hard chromium carbide particles prevent abrasive particles from cutting into the pipe surface.
② Impact Wear
The steel base pipe absorbs impact forces while the overlay layer protects against surface damage.
③ Erosion Wear
Common wear areas include:
The chromium carbide layer reduces material loss caused by high-speed particle flow.
| Pipe Type | Relative Wear Life |
| Carbon Steel Pipe | 1× |
| Rubber Lined Pipe | 2–5× |
| CCO Pipe | Several times longer depending on conditions |
Although CCO pipes have a higher initial cost, they offer long-term operational capability and effectively reduce maintenance costs, making them suitable for continuous production industries.
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| Application | Recommended Overlay Thickness |
| Coal Powder Conveying | 3–6 mm |
| Fly Ash Pipeline | 4–8 mm |
| Cement Raw Material | 6–10 mm |
| Mining Slurry Pipeline | 8–12 mm |
| Ore Concentrate Pipeline | 10–15 mm |
| Severe Abrasion Conditions | 12–15 mm |
| Item | CCO Pipe | Ceramic Pipe |
| Abrasion Resistance | Excellent | Excellent |
| Impact Resistance | Better | Lower |
| Welding | Easy | Difficult |
| Repair | Easy | Difficult |
| Weight | Moderate | Higher |
| Complex Fabrication | Better | Limited |
Chromium Carbide Overlay (CCO) pipe is a composite wear-resistant steel pipe designed for high-wear industrial conveying systems. By overlaying a high-chromium carbide alloy layer onto a carbon steel base pipe, it combines the structural strength of steel with the exceptional wear resistance of the alloy layer.
It is particularly suitable for:
For pipeline systems characterized by continuous operation, high wear, and high maintenance costs, CCO pipe significantly extends service life and reduces overall operating costs.
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