Introduction
Black mild steel pipe is a type of carbon steel pipe that is produced without galvanization and retains a dark iron oxide surface finish. It is widely used in construction, structural frameworks, mechanical engineering, and fluid transportation systems.
| Tolerance | ±1% |
| Standard | GB, BS, DIN, EN, JIS, ASTM, A53,SCH40/80STD ,BS-EN10255-2004 |
| Alloy Or Not | Non-Alloy |
| Technique | ERW |
| Thickness | 1-80mm, can be customized |
| Length | 6m, 12m, can be customized |
| Outer Diameter | 21-2000mm, can be customized |
| Application | Greenhouse construction, Architecture, Bridge, boiler, shipbuilding, power plant, pipeine, mechanical processing |
Features
- Strong Mechanical Strength
Black mild steel pipes are made from carbon steel, providing reliable strength and durability for structural and industrial applications.
- Good Weldability and Fabrication Performance
The material can be easily welded, cut, threaded, and processed, making it suitable for a wide range of fabrication and installation needs.
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Good High-Temperature Performance
Black steel pipes can maintain structural strength and stability when exposed to elevated temperatures, making them suitable for applications where temperature resistance and durability are required.
Material and Composition
Material Standards
Common materials include Q195, Q215, and Q235 from China, as well as international standards such as ASTM 1010, 1017, and 1020, as well as S235, S275, and SS400.
| Element | Content Range | Function | ||
| Carbon (C) | ≤0.25% | Ensures plasticity and weldability; excessive content reduces toughness | ||
| Manganese (Mn) | 0.60 - 1.20% | Enhances strength and toughness, improves hot workability | ||
| Silicon (Si) | ≤0.40% | Strengthen ferrite, increases strength | ||
| Phosphorus (P) | ≤0.045% | An impurity element; controlling its content prevents brittleness | ||
| Sulfur (S) | ≤0.045% | An impurity element; controlling its content prevents thermal cracking | ||
| Iron (Fe) | Remaining amount | Base element | ||
Mechanical properties
Tensile strength: 320 - 550 MPa; Yield strength: 195 - 345 MPa; Elongation rate ≥ 20% (slight variations exist for different materials).
It has good plasticity and toughness, can withstand certain impacts and vibrations, and is suitable for processing such as cold bending and cutting.
Surface Finish Options
Natural state: The surface is formed by hot rolling / cold drawing, with a black oxide layer (mainly composed of Fe₃O₄), presenting a dark gray to black matte texture. It provides basic rust protection, but its overall corrosion resistance is weaker than that of galvanized pipes. Long-term exposure requires additional preservative treatment.
Customization options
- Custom Pipe Dimensions
Black mild steel pipes can be supplied in various diameters, wall thicknesses, and lengths to meet different engineering requirements.
- Steel Grade Selection
Different mild steel grades are available depending on the required strength and application standards.
- Pipe Cutting and Processing
Additional services such as cutting, threading, and basic fabrication can be provided according to customer specifications.
- Surface Treatment Options
Optional surface treatments such as oiling, painting, or anti-rust coatings can be applied to improve corrosion protection.
FAQs
1. What are the common manufacturing methods for black mild steel pipes?
Black mild steel pipes are typically produced through processes such as electric resistance welding (ERW) or seamless manufacturing, depending on the required strength and application.
Black mild steel pipes are typically produced through processes such as electric resistance welding (ERW) or seamless manufacturing, depending on the required strength and application.
2. Can black mild steel pipes be threaded for connections?
Yes, these pipes can be threaded at the ends to allow easy connection with fittings in piping systems.
Yes, these pipes can be threaded at the ends to allow easy connection with fittings in piping systems.
3. What standards are black mild steel pipes usually produced to?
They can be manufactured according to various international standards such as ASTM, BS, or other relevant industrial specifications depending on project requirements.
They can be manufactured according to various international standards such as ASTM, BS, or other relevant industrial specifications depending on project requirements.
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