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Technical Specifications
Product Overview
Black Steel Pipe is manufactured from high-quality carbon steel with a characteristic black oxide coating formed during the manufacturing process. This coating provides basic corrosion protection and gives the pipe its distinctive dark appearance. Black steel pipe is widely used for gas distribution, water supply, and general structural applications.
Key Features:
- Cost-effective solution for general piping applications
- Good weldability and machinability
- Suitable for both threaded and welded connections
- Available in various schedules and sizes
- Complies with major international standards
Manufacturing Process: Produced through Electric Resistance Welding (ERW) or seamless processes, with black oxide coating applied during manufacturing for enhanced durability and corrosion resistance.
Applications: Gas distribution systems, water supply lines, fire sprinkler systems, HVAC applications, structural supports, fencing, and general industrial piping where moderate corrosion resistance is required.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A53 Requirement |
|---|---|---|---|---|
| Carbon (C) | - | 0.30 | 0.18 | ≤ 0.30 |
| Manganese (Mn) | 0.29 | 1.06 | 0.65 | 0.29-1.06 |
| Phosphorus (P) | - | 0.05 | 0.025 | ≤ 0.05 |
| Sulfur (S) | - | 0.06 | 0.035 | ≤ 0.06 |
| Silicon (Si) | - | 0.40 | 0.25 | ≤ 0.40 |
| Copper (Cu) | - | 0.40 | 0.20 | ≤ 0.40 |
| Nickel (Ni) | - | 0.40 | 0.15 | ≤ 0.40 |
| Chromium (Cr) | - | 0.40 | 0.12 | ≤ 0.40 |
| Iron (Fe) | Balance | Balance | 98.5 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 415 MPa min | 450 MPa | ASTM A370 | Room Temp |
| Yield Strength | 240 MPa min | 275 MPa | ASTM A370 | Room Temp |
| Elongation | 23% min | 28% | ASTM A370 | Room Temp |
| Hardness (Brinell) | - | 130 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | - | 75 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 210 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 80+ J | ASTM E23 | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 7.85 | g/cm3 | 20°C | ASTM B311 |
| Melting Point | 1510-1540 | °C | - | DSC Analysis |
| Thermal Conductivity | 50-60 | W/m·K | 100°C | ASTM E1461 |
| Specific Heat | 460 | J/kg·K | 0-100°C | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100°C | ASTM E228 |
| Electrical Resistivity | 100-200 | n|°¤m | 20°C | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | °C | - | Ferromagnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Outside Diameter (OD) | 15mm - 610mm | Various | Yes | ±1.0mm |
| Wall Thickness | 2.0mm - 22mm | Various | Yes | ±12.5% |
| Length | 3m - 12m | 6m | Yes | +100mm/-0mm |
| Surface Finish | Black, Painted, Oiled | Black | Yes | Standard mill |
| Weld Type | ERW, LSAW, SSAW | ERW | All types | API standard |
| End Connection | Plain, Beveled, Threaded | Plain | Yes | ASME B36.10 |
| Standards Compliance | ASTM A53, A106, API 5L | A53 | Multiple | Full compliance |
| Pressure Rating | Schedule 40 - 160 | Schedule 40 | Yes | ASME B31.1 |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Loose, Containers | Bundles | Custom | Export standard |
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Our Advantages in Processing 黒鋼パイプ
Superior Corrosion Protection
The manufacturing process creates a protective iron oxide coating through controlled oxidation, providing natural corrosion resistance without additional treatments. This black surface layer acts as a barrier against environmental factors, extending the pipe's service life.
Precision Steel Rolling Process
Advanced rolling technology ensures uniform wall thickness and precise dimensional accuracy throughout the pipe length. The controlled manufacturing process delivers consistent material properties and structural integrity for reliable performance.
Heat Treatment Optimization
Specialized heat treatment during production enhances the steel's mechanical properties, resulting in optimal strength-to-weight ratio and improved ductility. This process ensures the pipes can withstand high pressure and temperature variations.
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