Columbium has been added to the austenitic 18/8 Grade 304 in ASTM A269 TP 347 / 347H Stainless Steel Seamless Pipes and Tubes, stabilizing the steel and preventing carbide precipitation, which leads to intergranular corrosion. Even at cryogenic temperatures, the steel possesses good forming, welding, and toughness properties.
ASTM A269 TP 347/347H is a standard specification developed by ASTM International for seamless and welded stainless steel tubing. This tubing is primarily designed for use in applications where resistance to corrosion and high temperatures is crucial. The "TP" in the designation stands for "Tube" or "Tubing," and "347/347H" refers to the specific stainless steel grades covered by this specification. The stainless steel grades 347 and 347H are both part of the austenitic family, known for their exceptional corrosion resistance and ability to withstand high temperatures. These grades are particularly useful in environments containing corrosive elements such as acids and alkalis. The presence of niobium and tantalum in these grades contributes to their stability, especially during welding and exposure to elevated temperatures.
The tubing can be manufactured using two methods: seamless and welded. Seamless tubing is produced without any welding seams, resulting in a smooth and continuous structure. Welded tubing, on the other hand, is formed by joining sections of stainless steel through welding processes. The 347/347H grades find their application in a variety of industries, including chemical processing, oil and gas, and power generation. Their ability to withstand both corrosion and high temperatures makes them suitable for critical environments where the integrity of the material is of paramount importance.
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Specification:
| Specification | ASTM A269 TP 347/347H |
| Stainless Steel Grades | 347 and 347H |
| Tubing Type | Seamless and Welded |
| Crystal Structure | Austenitic |
| Stabilization | Niobium and Tantalum |
| Corrosion Resistance | Excellent in corrosive environments |
| High-Temperature Strength | Suitable for elevated temperatures |
| Common Applications | Chemical processing, oil and gas, power generation |
| Welding Suitability | Stable during welding and at high temperatures |
Chemical Composition of ASTM A269 TP 347/347H STAINLESS STEEL TUBES
| Element | Composition Range (Weight %) |
| 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) | 17.00 - 20.00 |
| Nickel (Ni) | 9.00 - 13.00 |
| Niobium (Nb) | 10x(C) min - 1.00 max |
Mechanical Properties of ASTM A269 TP 347/347H STAINLESS STEEL TUBES
| Property | Minimum Value (Typical) |
| Tensile Strength | 75 ksi (515 MPa) min |
| Yield Strength (0.2% offset) | 30 ksi (205 MPa) min |
| Elongation | 40% min |
| Hardness (Brinell) | 201 max |
| Hardness (Rockwell B) | 95 max |
Advantages of ASTM A269 TP 347/347H STAINLESS STEEL 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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