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ASTM A268 TP430Ti Seamless Tube
Detailed explanation of ASTM A268 TP430Ti seamless tube
ASTM A268 is a standard specification for ferritic and martensitic stainless steel seamless and welded tube, suitable for general corrosion resistance and medium and high temperature services (usually ≤400°C). TP430Ti is one of the titanium-stabilized ferritic stainless steel materials, designed for improved weldability and intergranular corrosion resistance.
ASTM A268 TP430Ti seamless tube is an economical choice for medium and low temperature corrosion environments due to its low cost, oxidation resistance and stress corrosion resistance, especially suitable for replacing austenitic stainless steel 304/316L. However, it needs to be carefully evaluated in harsh chemical environments, and molybdenum-containing or duplex stainless steel (such as 2205) should be selected when necessary.
Role of titanium:
Fix carbon, form TiC, and prevent intergranular corrosion caused by chromium carbide precipitation.
Improve the corrosion resistance of the weld heat affected zone (HAZ) and reduce the risk of sensitization.
Advantages:
Weakly corrosive environments: fresh water, air, organic acids (such as acetic acid).
Anti-oxidation: Better than 304 stainless steel at high temperatures (≤800°C).
Resistance to chloride stress corrosion cracking (SCC): Better than austenitic stainless steel (such as 304/316).
Limitations:
Insufficient corrosion resistance in strong acids (hydrochloric acid, sulfuric acid), alkaline solutions or high concentrations of chlorides (such as seawater).
| Grade | C | Si | Mn | P | S | Cr | Ti | Ni |
| TP430Ti, UNS S43036 | 0.10 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 25.0~27.5 | 5XC min, 0.75 max. | 0.75 max |
Mechanical properities
| Tensile strength Mpa, min | Yield strength Mpa, min | Elongation in 2'' %, min. |
| 415 | 240 | 20 |
Advantages of ASTM A268 TP430Ti seamless tube
1. Excellent resistance to chloride stress corrosion cracking (SCC)
2. High temperature oxidation resistance
3. High cost-effectiveness, material cost is greatly reduced compared with nickel-containing austenitic stainless steel (such as 304, 316).
4. Good processing and weldability
5. Resistance to high temperature sulfidation and oxidation
6. Environmental adaptability Fresh water and weak acid environment, thermal cycle stability.
