Product Description
1. Introduction
The ASTM A795m Welded Carbon Steel Tubes Hot - Dipped Pipe is a highly practical and versatile product widely used in numerous industries. Engineered to meet the ASTM A795m standard, these pipes combine the benefits of welded carbon steel construction with a hot - dipped coating, providing excellent performance in terms of strength, durability, and corrosion resistance.
2. Material Properties and Composition
2.1 Material Properties
- High Strength: Carbon steel used in these pipes offers significant tensile and yield strength, enabling them to withstand high - pressure applications and heavy loads. This strength makes them suitable for various structural and fluid - carrying applications, such as in water supply systems, gas pipelines, and construction projects.
- Good Ductility: The pipes exhibit good ductility, allowing for easy bending and shaping during installation. This property ensures flexibility in design and installation, facilitating the creation of complex piping layouts without the risk of cracking or breaking.
- Weldability: The welded construction of the pipes provides the advantage of easy connection and extension. Skilled welding techniques can be employed to join the pipes together, creating a seamless and reliable pipeline system.
2.2 Chemical Composition
The carbon steel used in these pipes typically has the following chemical composition. The elements work together to contribute to the overall performance of the material:
| Element |
Content Range (%) |
Role |
| Carbon (C) |
0.12 - 0.25 |
Increases the strength and hardness of the steel, but excessive amounts can reduce ductility and weldability |
| Manganese (Mn) |
0.30 - 0.90 |
Enhances the strength and hardenability of the steel, also acts as a deoxidizer |
| Silicon (Si) |
0.10 - 0.40 |
Helps in deoxidation during steel production and can improve strength and resistance to wear |
| Phosphorus (P) |
≤0.04 |
Improves the strength and corrosion resistance to some extent, but too much can embrittle the steel |
| Sulfur (S) |
≤0.05 |
Generally considered an impurity, high levels can reduce the ductility and impact toughness of the steel |
3. Hot - Dipped Coating
The hot - dipping process is a key feature of these pipes, providing an additional layer of protection.
- Corrosion Resistance: The hot - dipped coating, often made of zinc, forms a protective barrier on the surface of the pipe. Zinc reacts with the atmosphere to create a layer of zinc oxide, which prevents the underlying carbon steel from coming into contact with moisture and oxygen, thus significantly enhancing the pipe's corrosion resistance. This makes the pipes suitable for outdoor applications, underground installations, and environments where exposure to corrosive elements is common.
- Longevity: The hot - dipped coating extends the service life of the pipes. By protecting against rust and corrosion, the pipes can maintain their structural integrity and functionality for a longer period, reducing the need for frequent replacements and maintenance, and ultimately saving costs for users.
4. Applications
- Water Supply and Sanitation: These pipes are widely used in municipal water supply systems, as well as in industrial and residential plumbing. Their strength and corrosion resistance ensure the safe and reliable transportation of water, while the hot - dipped coating protects against the corrosive effects of water and soil.
- Gas Distribution: In natural gas and liquefied petroleum gas (LPG) distribution networks, the ASTM A795m welded carbon steel hot - dipped pipes are used to transport gas over long distances. Their high - pressure - bearing capacity and resistance to external corrosion make them a reliable choice for gas infrastructure.
- Construction Industry: In construction, these pipes are employed for various purposes, including structural support in buildings, scaffolding, and as conduits for electrical and plumbing systems. Their strength and durability contribute to the stability and safety of construction projects.
- Agricultural Irrigation: For agricultural irrigation systems, these pipes can be used to convey water from sources to fields. The corrosion - resistant hot - dipped coating ensures that the pipes remain functional even in the harsh outdoor agricultural environment, where they may be exposed to soil, fertilizers, and pesticides.
5. Equivalent Grades and Standards
The ASTM A795m standard has equivalents in other international and national standards. This allows for greater compatibility and flexibility in global procurement and usage. Here are some common equivalent grades:
| Standard |
Equivalent Grade |
| EN (European Norm) |
[Relevant European grade for similar welded carbon steel pipes] |
| JIS (Japanese Industrial Standard) |
[Corresponding Japanese grade] |
| GB (Chinese National Standard) |
[Appropriate Chinese grade] |
These equivalent grades share similar mechanical and chemical properties, ensuring that pipes from different standards can often be used interchangeably in many applications while still meeting the required performance specifications.
6. Manufacturing and Quality Assurance
- Manufacturing Process: The pipes are manufactured through a series of processes, starting with the formation of carbon steel sheets or strips, which are then welded together to form the tube. After welding, the pipes undergo a hot - dipping process to apply the protective coating. Stringent quality control measures are implemented at each stage of production to ensure that the pipes meet the required dimensions, strength, and coating thickness.
- Quality Control: Quality control includes dimensional inspections to ensure that the pipes meet the specified outer diameter, wall thickness, and length. Mechanical property tests, such as tensile strength and yield strength tests, are conducted to verify the strength of the carbon steel. Additionally, coating thickness measurements and corrosion resistance tests are carried out to ensure the effectiveness of the hot - dipped coating.
| NPS Designator |
Inch |
mm |
Inch |
mm |
lb/ft |
kg/m |
psi |
MPa |
psi |
MPa |
| 3/4 |
1.05 |
-26.7 |
0.083 |
-2.11 |
0.86 |
-1.28 |
500 |
-3.45 |
700 |
-4.83 |
| 1 |
1.315 |
-33.4 |
0.109 |
-2.77 |
1.41 |
-2.09 |
500 |
-3.45 |
700 |
-4.83 |
| 1 1/4 |
1.66 |
-42.2 |
0.109 |
-2.77 |
1.81 |
-2.69 |
500 |
-3.45 |
1000 |
-6.89 |
| 1 1/2 |
1.9 |
-48.3 |
0.109 |
-2.77 |
2.09 |
-3.11 |
500 |
-3.45 |
1000 |
-6.89 |
| 2 |
2.38 |
-60.3 |
0.109 |
-2.77 |
2.64 |
-3.93 |
500 |
-3.45 |
1000 |
-6.89 |
| 2 1/2 |
2.88 |
-73 |
0.12 |
-3.05 |
3.53 |
-5.26 |
500 |
-3.45 |
1000 |
-6.89 |
| 3 |
3.5 |
-88.9 |
0.12 |
-3.05 |
4.34 |
-6.46 |
500 |
-3.45 |
1000 |
-6.89 |
| 3 1/2 |
4 |
-101.6 |
0.12 |
-3.05 |
4.98 |
-7.41 |
500 |
-3.45 |
1200 |
-8.27 |
| 4 |
4.5 |
-114.3 |
0.12 |
-3.05 |
5.62 |
-8.37 |
500 |
-3.45 |
1200 |
-8.27 |
| 5 |
5.56 |
-141.3 |
0.134 |
-3.4 |
7.78 |
-11.58 |
B |
B |
1200 |
-8.27 |
| 6 |
6.63 |
-168.3 |
0.134 |
-3.4 |
9.3 |
-13.85 |
B |
B |
1000 |
-5.51 |
| 8 |
8.63 |
-219.1 |
0.188C |
-4.78 |
16.96 |
-25.26 |
B |
B |
800 |
-4.83 |
| 10 |
10.75 |
-273.1 |
0.188C |
-4.78 |
21.23 |
-31.62 |
B |
B |
700 |
-6.89 |
| A:Schedule 10 corresponds to Schedule 10S as listed in ANSI B 36.19 for NPS 3⁄4 through 6 only. |
| B:Furnace-welded pipe is not made in sizes larger than NPS 4. |
| C:Not Schedule 10. |
Detailed Photos
Audited Supplier 
){kind=link}