ASTM A358 TP304H is a specification defined by the American Society for Testing and Materials (ASTM) that pertains to Electric Fusion Welded (EFW) pipes made from stainless steel grade TP304H. These pipes are widely used in various industrial applications that require resistance to corrosion, high temperatures, and pressure. The "TP" in the specification stands for "Type," followed by the numerical grade "304H," which indicates a specific composition of stainless steel alloy. The "H" suffix denotes the high carbon content modification of the base TP304 stainless steel, making it suitable for high-temperature service. This modification enhances its creep strength and resistance to sensitization at elevated temperatures.
Electric Fusion Welding (EFW) is the process used to manufacture these pipes. It involves fusing the edges of a stainless steel strip or plate together to create a continuous pipe. This method ensures a strong and uniform weld seam, making the pipes suitable for various demanding applications. ASTM A358 TP304H EFW pipes find extensive usage in industries like petrochemical, chemical processing, power generation, and more, where they are employed for conveying fluids and gases in aggressive environments. Their resistance to oxidation and corrosion, coupled with their ability to withstand high temperatures, makes them an excellent choice for applications involving heat exchangers, boilers, and other high-temperature equipment.
These pipes are available in various sizes, wall thicknesses, and lengths, catering to different project requirements. They are often fabricated to meet specific standards and project specifications. It's essential to adhere to proper welding procedures and post-weld heat treatments to maintain the integrity and properties of the material. In summary, ASTM A358 TP304H EFW pipes are a specialized type of stainless steel pipe manufactured using the Electric Fusion Welding process. Their high-temperature resistance, corrosion resistance, and strength make them suitable for use in industries that require reliable performance under demanding conditions. Proper handling, welding, and quality control measures are crucial to ensure the pipes meet the required standards and specifications for various industrial applications.
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Specification:
| Specification | Description |
| Standard | ASTM A358 |
| Grade | TP304H |
| Type | Electric Fusion Welded (EFW) Pipe |
| Material | Stainless Steel TP304H |
| Carbon Content | High carbon content modification for high-temperature use |
| Welding Process | Electric Fusion Welding (EFW) |
| Application | Petrochemical, chemical processing, power generation, etc. |
| Uses | Conveying fluids and gases in aggressive environments |
| Properties | High-temperature resistance, corrosion resistance, strength |
| Common Sizes | Various sizes available, tailored to project requirements |
| Standards | Manufactured to meet specific standards and specifications |
Chemical Composition of ASTM A358 TP304h EFW Pipe
| Element | Composition Range |
| Carbon (C) | 0.04% - 0.10% |
| Manganese (Mn) | 2.00% max |
| Phosphorus (P) | 0.045% max |
| Sulfur (S) | 0.030% max |
| Silicon (Si) | 0.75% max |
| Chromium (Cr) | 18.0% - 20.0% |
| Nickel (Ni) | 8.0% - 11.0% |
| Nitrogen (N) | 0.10% max |
Mechanical Properties ofASTM A358 TP304h EFW Pipe
| Property | Value |
| Tensile Strength | ≥ 75 ksi (515 MPa) min |
| Yield Strength (0.2% Offset) | ≥ 30 ksi (205 MPa) min |
| Elongation | ≥ 30% |
Advantages of ASTM A358 TP304h 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 |
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| Heat Exchangers | Gas Processing |
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