| Tolerance | ±1% |
| Alloy Or Not | Is Alloy |
| Surface Finish | BA/2B/NO.1/NO.3/NO.4/8K/HL/2D/1D |
| Out diameter | 100mm,150mm,200mm,300mm,400mm, larger sizes can be customized |
| Length | 6-12m,can be customized |
| Thickness | 2-20mm |
| Advantage | Strong Corrosion Resistance |
Product Overview
Large-diameter stainless steel pipes usually refer to stainless steel pipe materials with an outer diameter greater than 508mm (20 inches). Due to their excellent corrosion resistance, high strength, good toughness and machinability, they play a core role in many industrial fields and large-scale projects.
Material and Composition
304, 304L, 316, and 316L are the mainstream austenitic materials for large-diameter stainless steel pipes. Their chemical compositions strictly follow standards such as GB/T 14976 and ASTM A312. The content of core elements determines key performance indicators such as corrosion resistance and toughness. The specific components (mass fraction, %) are as shown in the table below:
| Material grade | Carbon (C) ≤ | Silicon (Si) ≤ | Manganese (Mn) ≤ | Phosphorus (P) ≤ | Sulfur (S) ≤ | Chromium (Cr) |
|
304 |
0.08 |
1.00 |
2.00 |
0.045 |
0.030 |
18.00-20.00 |
|
304L |
0.03 |
1.00 |
2.00 |
0.045 |
0.030 |
18.00-20.00 |
|
316 |
0.08 |
1.00 |
2.00 |
0.045 |
0.030 |
16.00-18.00 |
|
316L |
0.03 |
1.00 |
2.00 |
0.045 |
0.030 |
16.00-18.00 |
Manufacturing Process
Submerged Arc Welding (SAW): The stainless steel plates are rolled into tubular shapes using a roll forming machine. Submerged arc welding technology is employed for straight or spiral seam welding. Subsequently, the process involves straightening, flaw detection, heat treatment, and water pressure testing to complete the shaping. This process is suitable for pipe materials with an outer diameter ranging from 508mm to 3000mm and a wall thickness of 6mm to 100mm. It features high welding efficiency and stable weld quality, making it the core manufacturing process for large-diameter stainless steel pipes. It is widely used in the fields of chemical engineering, municipal works, and energy.
Mechanical properties
The mechanical properties of large-diameter stainless steel pipes are significantly influenced by the material, manufacturing process, and heat treatment method. The core mechanical performance indicators of different materials are as follows (at room temperature, in accordance with standards such as GB/T 14976 and ASTM A312):
| Material/Process Type | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Impact energy (Akv, J) |
|
304/304L |
≥485 |
≥170 |
≥40 |
≥30 |
|
316/316L |
≥485 |
≥170 |
≥40 |
≥30 |
Typical Applications
The large-diameter stainless steel pipes, due to their excellent comprehensive performance, are widely used in various fields such as industry, municipal affairs, energy, and marine engineering. The specific scenarios are as follows:
petrochemical industry: They are used for transporting crude oil, natural gas, chemical raw materials, and corrosive media, as well as for the pipes of reaction vessels and heat exchangers. The mainstream materials are 316L and 2205 duplex stainless steel, suitable for high-pressure and corrosive conditions.
municipal engineering field: It is used for urban water supply, sewage treatment, gas transmission pipelines, especially large-diameter water supply pipelines. It is made of 304 and 316L materials, featuring resistance to rust, long service life (up to 50 years or more), and low maintenance costs. It replaces traditional carbon steel pipelines.
energy and power sector: For steam transportation, cooling water circulation pipelines in thermal power, nuclear power and wind power projects, as well as high-temperature medium transportation pipelines for solar thermal power generation, materials such as 310S, 321, and 2507 are commonly used, which are suitable for high-temperature, high-pressure and strong radiation conditions.
Our Advantages
We offer a broad range of large-diameter stainless steel pipes to fit varied project needs, including both thin wall and heavy wall configurations. Our product line covers standard sizes for immediate use, while also providing custom-sized solutions to match unique design requirements. At maximum capacity, these pipes reach an outside diameter of 40 inches and a wall thickness of up to 70 mm-dimensions that cater to large-scale applications requiring robust piping systems.
All our large-diameter stainless steel pipes are manufactured in line with most ASTM standards and international specifications, ensuring seamless integration into global projects. We stock widely used grades like 304, 304L, 316, and 316L to meet common industrial demands. For specialized needs, we also supply additional stainless steel grades that align with specific industry standards, ensuring flexibility for projects with unique material requirements.
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