ASTM A358 TP 317L is a specification established by the American Society for Testing and Materials (ASTM) for electric-fusion-welded (EFW) stainless steel pipes. These pipes are primarily designed for high-temperature and corrosive environments, making them suitable for a wide range of industrial applications, such as chemical processing, petrochemical, and power generation. The "TP" in the specification stands for "Type," indicating the specific grade of stainless steel used, in this case, Grade 317L. Stainless steel grade 317L is a low-carbon variation of Grade 317, possessing enhanced resistance to sensitization and corrosion due to its higher molybdenum content. This makes it particularly well-suited for applications involving exposure to aggressive chemicals, acids, and chloride-containing environments, where standard austenitic stainless steels might be susceptible to corrosion. The "L" in 317L denotes its low carbon content, which further contributes to its resistance against sensitization and intergranular corrosion.
The EFW (electric-fusion-welded) manufacturing process involves the use of electrical energy to generate heat, which fuses the edges of the stainless steel strip or plate to form a pipe. This process ensures consistent and uniform welds, resulting in pipes with excellent dimensional accuracy and structural integrity. EFW pipes offer distinct advantages, including the ability to produce larger diameter pipes compared to traditional methods like seamless or longitudinal welded pipes. ASTM A358 TP 317L specifies various mechanical and chemical requirements for the manufacturing of these pipes. These requirements include dimensions, tolerances, tensile strength, yield strength, elongation, hardness, and chemical composition. Additionally, the standard outlines different non-destructive tests, such as hydrostatic testing and eddy current testing, to ensure the quality and reliability of the pipes.
ASTM A358 TP 317L stainless steel EFW pipes are engineered to meet the demands of high-temperature and corrosive environments. Their composition, with Grade 317L stainless steel, imparts superior resistance to corrosion and sensitization. The electric-fusion-welding process ensures precise and robust welds, making these pipes suitable for various industries where durability and resistance to harsh conditions are essential. Compliance with the ASTM A358 standard guarantees that these pipes adhere to strict quality and performance criteria, making them a dependable choice for critical applications in challenging environments.
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Specification:
| Specification | Details |
| Standard | ASTM A358 TP 317L |
| Grade | 317L |
| Type | Electric-Fusion-Welded (EFW) Stainless Steel Pipe |
| Application | High-temperature and corrosive environments |
| Carbon Content | Low carbon content ("L" designation) |
| Corrosion Resistance | Enhanced resistance to sensitization and corrosion in aggressive environments |
| Manufacturing Process | Electric-fusion-welding process |
| Advantages | Larger diameter pipes can be produced compared to seamless or longitudinal welded pipes |
| Non-Destructive Tests | - Hydrostatic Testing - Eddy Current Testing |
| Applications | Chemical processing, petrochemical, power generation, and other industries requiring corrosion-resistant pipes |
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Chemical Composition of ASTM A358 TP 317L STAINLESS STEEL EFW PIPE
| Element | Chemical Composition |
| Carbon (C) | ≤ 0.03% |
| Chromium (Cr) | 18.0 - 20.0% |
| Nickel (Ni) | 11.0 - 15.0% |
| Molybdenum (Mo) | 3.0 - 4.0% |
| Others | ≤ 2.00% |
Mechanical Properties of ASTM A358 TP 317L 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) |
Advantages of ASTM A358 TP 317L 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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