ASTM A358 TP 321 is a specification outlined by the American Society for Testing and Materials (ASTM) for electric-fusion-welded (EFW) stainless steel pipes. These pipes are specifically designed to cater to industries that require high-temperature and corrosive resistance, making them ideal for applications in sectors like chemical processing, petrochemical, and power generation. The "TP" in the specification stands for "Type," signifying the stainless steel grade used, in this case, Grade 321. Stainless steel Grade 321 offers excellent resistance to oxidation and corrosion, particularly in elevated temperature environments. This grade contains titanium as a stabilizing element, which aids in preventing sensitization during welding and other high-temperature processes. This characteristic makes it suitable for applications where exposure to extreme heat and corrosive substances is common.
The electric-fusion-welded (EFW) manufacturing process involves utilizing electrical energy to create the necessary heat for fusing the edges of stainless steel plates or strips, forming seamless pipes. This method ensures uniform welds and consistent pipe dimensions, ensuring structural integrity. EFW pipes possess certain advantages, such as the ability to produce larger diameter pipes compared to traditional methods like seamless or longitudinal welded pipes. In this context, Metal Tubular serves as a supplier of ASTM A358 TP 321 stainless steel EFW pipes. Metal Tubular is recognized for providing high-quality stainless steel pipes that adhere to strict standards and specifications. By supplying ASTM A358 TP 321 pipes, Metal Tubular contributes to industries requiring durable and corrosion-resistant pipes for demanding applications.
ASTM A358 TP 321 stainless steel EFW pipes cater to industries requiring reliable solutions for high-temperature and corrosive environments. Grade 321 stainless steel's exceptional oxidation and corrosion resistance, coupled with the advantages of the EFW process, make these pipes suitable for various industrial applications. The inclusion of Metal Tubular as a supplier emphasizes the availability of these pipes from a reputable source, ensuring the delivery of dependable and high-performance products.
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Specification:
| Specification | Details |
| Standard | ASTM A358 TP 321 |
| Grade | 321 |
| Type | Electric-Fusion-Welded (EFW) Stainless Steel Pipe |
| Application | High-temperature and corrosive environments |
| Stabilizing Element | Titanium |
| Manufacturing Process | Electric-fusion-welding process |
| Supplier | Metal Tubular |
| Advantages | Larger diameter pipes can be produced compared to seamless or longitudinal welded pipes |
Chemical Composition of ASTM A358 TP 321 STAINLESS STEEL EFW PIPE
| Property | Minimum Value |
| Tensile Strength | ≥ 515 MPa (75,000 psi) |
| Yield Strength | ≥ 205 MPa (30,000 psi) |
| Elongation | ≥ 35% |
| Hardness | ≤ 217 Brinell (HB) |
Mechanical Properties of ASTM A358 TP 321 STAINLESS STEEL EFW PIPE
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 0.28 | 2580 | 460 MPa | 560 MPa | 20 % |
Advantages of ASTM A358 TP 321 STAINLESS STEEL EFW PIPE
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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