ASTM A269 TP 321 Stainless Steel Seamless Tubes represent a distinct category of stainless steel tubing that aligns with the specifications of the ASTM A269 standard. This standard, established by the American Society for Testing and Materials (ASTM), outlines the criteria for various types of seamless and welded austenitic stainless steel tubing. These tubes are designed to endure general corrosion and are engineered to perform effectively across a wide range of temperature environments. The designation "TP 321" signifies that these tubes fall within the "Tube, Pipe" category and are fabricated from stainless steel grade 321.
Stainless steel grade 321 is characterized by its unique composition, including the addition of titanium for stabilization purposes. This stabilization grants the alloy exceptional resistance to intergranular corrosion, making it particularly suitable for applications that involve exposure to elevated temperatures. Industries such as aerospace, chemical processing, and petrochemical rely on grade 321 stainless steel tubes for their ability to maintain structural integrity and resist corrosion in demanding conditions. The term "seamless" indicates that these tubes are manufactured without any welded joints, contributing to their uniformity and strength. This manufacturing process renders seamless tubes advantageous in high-pressure and high-temperature settings.
The term "seamless" indicates that these tubes are manufactured without any welded joints, contributing to their uniformity and strength. This manufacturing process renders seamless tubes advantageous in high-pressure and high-temperature settings. In essence, ASTM A269 TP 321 Stainless Steel Seamless Tubes offer a specialized solution for scenarios requiring both corrosion resistance and the capability to withstand elevated temperatures. Their adherence to the ASTM A269 standard assures industries of their quality and performance, making them a reliable choice for various applications across different sectors.
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Specification:
| Specification | Description |
| Standard | ASTM A269 |
| Material Grade | TP 321 (Austenitic Stainless Steel) |
| Tube Type | Seamless |
| Application | General Corrosion-Resisting, High-Temperature Service |
| Corrosion Resistance | Excellent |
| Temperature Range | High-Temperature Service |
| Common Uses | Aerospace, Chemical Processing, Petrochemical, etc. |
| Cross-Sectional Shape | Round |
Chemical Composition of ASTM A269 TP 321 Stainless Steel Seamless Tubes
| Element | Composition Range (%) |
| Chromium (Cr) | 17.0 - 19.0 |
| Nickel (Ni) | 9.0 - 12.0 |
| Titanium (Ti) | 5 x (C%) min, 0.60% max |
| Carbon (C) | Maximum 0.08 |
| Manganese (Mn) | Maximum 2.00 |
| Silicon (Si) | Maximum 1.00 |
| Phosphorus (P) | Maximum 0.045 |
| Sulfur (S) | Maximum 0.030 |
Mechanical Properties of ASTM A269 TP 321 Stainless Steel Seamless Tubes
| Property | Value |
| Tensile Strength | 75,000 psi (515 MPa) minimum |
| Yield Strength | 30,000 psi (205 MPa) minimum |
| Elongation | 40% minimum |
| Hardness (Brinell) | 217 maximum (for annealed condition) |
Advantages of ASTM A269 TP 321 Stainless Steel Seamless Tubes
- 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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