ASTM A928 S31200 S31260 S31500 S31803 S32003 Duplex Stainless Steel Pipe Electric Fusion Welded With Addition Of Filler Metal
Introduction
ASTM A928 is a specification for electric fusion welded duplex stainless steel pipe with the addition of filler metal. This specification covers various grades of duplex stainless steel, including S31200, S31260, S31500, S31803, and S32003. These pipes are widely used in various industries due to their excellent corrosion resistance, high strength, and good weldability.
Material and Specification
The ASTM A928 specification covers electric fusion welded duplex stainless steel pipes with a nominal pipe size ranging from 14 inches to 96 inches. The pipes are manufactured using the electric fusion welding process, which involves the joining of two metal plates through the application of heat generated by an electric arc. The filler metal is added during the welding process to ensure a strong and durable bond.
Key Features
- Corrosion Resistance: Duplex stainless steel pipes exhibit excellent resistance to corrosion, making them suitable for applications in harsh environments, such as offshore oil and gas platforms.
- High Strength: These pipes have a high tensile strength, allowing them to withstand high-pressure conditions.
- Good Weldability: The addition of filler metal during the welding process enhances the weldability of these pipes, ensuring a reliable and secure joint.
- Cost-Effective: Duplex stainless steel pipes offer a cost-effective solution due to their long service life and low maintenance requirements.
Chemical Composition
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| S31200 | 0.03 max | 2.00 max | 0.030 max | 0.020 max | 1.00 max | 4.50-6.50 | 24.0-26.0 | 0.14-0.20 | 0.05-0.10 |
| S31260 | 0.03 max | 2.00 max | 0.030 max | 0.020 max | 1.00 max | 5.50-7.50 | 24.0-26.0 | 0.20-0.30 | 0.10-0.25 |
| S31500 | 0.03 max | 1.20 max | 0.030 max | 0.020 max | 1.00 max | 4.50-6.50 | 18.0-19.0 | 2.50-3.00 | 0.05-0.10 |
| S31803 | 0.03 max | 2.00 max | 0.030 max | 0.020 max | 1.00 max | 4.50-6.50 | 21.0-23.0 | 2.50-3.50 | 0.08-0.20 |
| S32003 | 0.03 max | 2.00 max | 0.030 max | 0.020 max | 1.00 max | 3.00-4.00 | 22.0-23.0 | 1.50-2.00 | 0.14-0.20 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| S31200 | 620 min | 450 min | 25 min | 290 max |
| S31260 | 690 min | 485 min | 25 min | 290 max |
| S31500 | 630 min | 450 min | 25 min | 290 max |
| S31803 | 620 min | 450 min | 25 min | 290 max |
| S32003 | 620 min | 450 min | 25 min | 290 max |
Steel Grade
The steel grades covered by ASTM A928 include S31200, S31260, S31500, S31803, and S32003. These grades offer a combination of high strength and excellent corrosion resistance, making them suitable for various applications.
Application
The ASTM A928 duplex stainless steel pipes find applications in a wide range of industries, including:
- Oil and Gas: These pipes are used in offshore platforms, subsea pipelines, and oil refineries due to their corrosion resistance and high strength.
- Chemical Processing: Duplex stainless steel pipes are employed in chemical plants for handling corrosive chemicals and acids.
- Desalination: The pipes are used in desalination plants for their resistance to chloride-induced stress corrosion cracking.
- Pulp and Paper: Duplex stainless steel pipes are utilized in the pulp and paper industry for their resistance to corrosive chemicals and high-pressure conditions.
Possible Alternative Grades
While ASTM A928 covers a range of duplex stainless steel grades, there are alternative grades available in the market that offer similar properties. Some possible alternative grades include 2205, 2507, and UNS S32750. These grades also provide excellent corrosion resistance and high strength, making them suitable substitutes for the ASTM A928 grades in certain applications.
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ASTM A928 S31200 Duplex Stainless Steel Pipe Electric Fusion Welded With Addition Of Ffiler Metal Images
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