ASTM A358 TP 316 is a specification established by the American Society for Testing and Materials (ASTM) that outlines the requirements for electric-fusion-welded (EFW) pipes made from stainless steel alloy 316. Stainless steel 316 is a widely used austenitic alloy known for its excellent corrosion resistance, high-temperature strength, and versatile applications across various industries. EFW pipes are manufactured using an electric fusion welding process, which involves the application of heat generated by an electric arc to melt the edges of the pipe and the filler material, resulting in a strong and seamless joint. These pipes are distinct from seamless pipes and are commonly used for applications requiring large-diameter pipes or when the cost-effectiveness of the manufacturing process is a primary consideration.
EFW pipes are manufactured using an electric fusion welding process, which involves the application of heat generated by an electric arc to melt the edges of the pipe and the filler material, resulting in a strong and seamless joint. These pipes are distinct from seamless pipes and are commonly used for applications requiring large-diameter pipes or when the cost-effectiveness of the manufacturing process is a primary consideration. ASTM A358 TP 316 EFW pipes adhere to stringent quality standards, ensuring that the material composition, mechanical properties, dimensions, and other critical attributes meet the specified requirements. These pipes are commonly employed in industries such as chemical processing, petrochemical, oil and gas, pharmaceuticals, and food processing, where resistance to corrosive environments is crucial.
The alloy composition of TP 316 stainless steel includes chromium, nickel, and molybdenum, contributing to its corrosion resistance and enhanced strength. This makes it suitable for applications in aggressive and chloride-rich environments. The pipes can be further customized through various surface finishes, such as pickling or polishing, to meet specific aesthetic and functional demands. In conclusion, ASTM A358 TP 316 stainless steel EFW pipes offer a reliable solution for transporting fluids and gases in industries requiring corrosion-resistant and durable piping systems. The stringent adherence to ASTM standards ensures the quality and reliability of these pipes, making them a popular choice for a wide range of applications across different sectors.
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Specification:
| Specification | ASTM A358 TP 316 |
| Material | Stainless Steel Alloy 316 |
| Welding Method | Electric Fusion Welding (EFW) |
| Diameter Range | 8 inches (200 mm) and larger |
| Wall Thickness | 0.109 inches (2.77 mm) and thicker |
| Standards | ASTM A358 / ASME SA358 |
| Corrosion Resistance | Excellent |
| Temperature Range | High-temperature applications |
| Surface Finishes | Pickled, Polished, or customized |
Chemical Composition of ASTM A358 TP 316 STAINLESS STEEL EFW PIPE
| Element | Composition Range |
| Chromium | 16.0 - 18.0% |
| Nickel | 10.0 - 14.0% |
| Molybdenum | 2.0 - 3.0% |
| Carbon | Maximum 0.08% |
| Silicon | Maximum 1.00% |
| Manganese | Maximum 2.00% |
| Phosphorus | Maximum 0.045% |
| Sulfur | Maximum 0.030% |
Mechanical Properties of ASTM A358 TP 316 STAINLESS STEEL EFW PIPE
| Property | Typical Value |
| Tensile Strength | ≥ 515 MPa (75,000 psi) |
| Yield Strength | ≥ 205 MPa (30,000 psi) |
| Elongation | ≥ 35% |
| Hardness (Brinell) | ≤ 217 HB |
| Hardness (Rockwell) | ≤ 95 HRB |
| Modulus of Elasticity | 200 GPa (29 x 10^6 psi) |
| Poisson's Ratio | 0.3 |
| Density | 8.0 g/cm³ (0.289 lb/in³) |
Advantages of ASTM A358 TP 316 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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