ASME SA213 TP347 Heat Exchanger Stainless Steel Seamless Tube , For High Temperature Environments
ASME SA213 TP347 Heat Exchanger Stainless Steel Seamless Tube , For High Temperature Environments
ASME SA213 TP347 is a specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. TP347 is a grade of stainless steel known for its excellent resistance to corrosion, high-temperature strength, and superior mechanical properties. This material is widely used in industries such as petrochemical, power generation, and chemical processing where high temperatures and corrosive environments are prevalent.
Material Overview
TP347 is a stabilized stainless steel grade with the addition of columbium (niobium) and tantalum, which enhances its resistance to intergranular corrosion, especially in high-temperature applications. Its ability to resist sensitization makes it suitable for applications where the material is exposed to prolonged heating.
Key Features:
- Excellent resistance to oxidation and corrosion.
- Superior high-temperature strength.
- Stabilization by columbium to prevent carbide precipitation.
- Outstanding mechanical properties under high-stress conditions.
- Suitable for both corrosive and high-temperature environments.
Chemical Composition
The chemical composition of TP347 stainless steel is carefully balanced to ensure optimal performance. The typical composition includes:
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 17.00–19.00 |
| Nickel (Ni) | 9.00–13.00 |
| Columbium (Nb) | 10×C to 1.00 |
| Iron (Fe) | Balance |
This composition ensures excellent heat resistance, mechanical strength, and corrosion resistance.
Mechanical Properties
ASME SA213 TP347 seamless tubes are designed to meet specific mechanical property requirements:
| Property | Value |
|---|---|
| Tensile Strength | Min 515 MPa (75 ksi) |
| Yield Strength | Min 205 MPa (30 ksi) |
| Elongation | Min 35% |
| Hardness (Brinell) | Max 217 |
These properties make TP347 suitable for demanding applications.
Heat Treatment
The TP347 tubes are generally solution annealed at temperatures between 1010°C and 1150°C, followed by rapid cooling to prevent carbide precipitation and ensure optimal corrosion resistance.
Applications
ASME SA213 TP347 seamless tubes are widely used in industries requiring high performance under extreme conditions. Common applications include:
- Heat Exchangers: Ideal for transferring heat in corrosive environments.
- Boilers: Used in high-pressure and high-temperature boiler systems.
- Superheaters: Suitable for superheating steam in power plants.
- Chemical Processing: Resistant to acids and other chemicals.
- Petrochemical Industry: Used in refineries and reactors.
Corrosion Resistance
TP347 stainless steel exhibits exceptional corrosion resistance in a variety of environments, including:
- Oxidizing Environments: Resists scaling and oxidation at high temperatures.
- Intergranular Corrosion: Stabilized with columbium, preventing carbide precipitation.
- Acidic Media: Performs well in sulfuric, nitric, and chloric acids.
Advantages
- High-temperature strength and stability.
- Superior resistance to oxidation and corrosion.
- Precision manufacturing for a flawless product.
- Long service life in harsh environments.
- Easy to fabricate and weld.
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