Niobium-stabilized For High-temperature Service
Astm a312 tp347h stainless steel pipe (uns s34709) for high-temperature service.
Niobium-stabilized For High-temperature Service
Astm a312 tp347h stainless steel pipe (uns s34709) for high-temperature service. niobium-stabilized austenitic grade with seamless/welded options.
TP347H (UNS S34709) seamless and welded austenitic stainless steel pipe per ASTM A312/ASME SA312. Niobium-stabilized to prevent intergranular corrosion in welded structures at elevated temperatures up to 1500°F (815°C). Sizes 1/8″–30″ NPS, Sch 5S–XXS, with excellent creep and corrosion resistance for boilers, heat exchangers, and chemical plants.
TP347H is a niobium-stabilized version of Type 347 stainless steel, designed for high-temperature applications where welding is involved. The "H" designation indicates higher carbon content for improved creep strength and stability at elevated temperatures. Manufactured to ASTM A312 for seamless and straight-seam welded pipes, it offers excellent resistance to sensitization and intergranular corrosion.
Commonly used in power generation, petrochemical, and thermal processing where sustained high temperatures (up to 1500°F) and corrosive environments are present.
| Element | Content Range (%) |
|---|---|
| Carbon (C) | 0.04–0.10 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–13.0 |
| Niobium (Nb) | 8×C–1.10 |
Note: Niobium is added for stabilization to reduce carbide precipitation and enhance resistance to intergranular corrosion.
| Property | Value |
|---|---|
| Tensile Strength, min | ≥515 MPa (≥75 ksi) |
| Yield Strength (0.2% offset), min | ≥205 MPa (≥30 ksi) |
| Elongation (in 50 mm), min | ≥35% |
| Hardness (Brinell, HBW), max | 201 |
| Hardness (Rockwell B, HRB), max | 95 |
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1400–1450°C (2552–2642°F) |
| Thermal Expansion Coefficient (20–100°C) | 16.6 μm/m·°C |
| Thermal Conductivity (100°C) | 15 W/m·K |
| Specific Heat Capacity (20°C) | 500 J/kg·K |
We stock stainless steels in a multitude of shapes and sizes.
We support our stainless steel stock with a wide range of shapes and sizes to suit your engineering applications. We hold thirteen different types of shapes to support the grades of material we stock, including bars, sheets and plates. Our stainless steel shapes are available in various grades, including 304, 304L, 316, and 316L, each offering unique properties to meet specific application requirements. Whether you need flat bars for structural support, round bars for machining, or sheets and plates for fabrication, we have the right stainless steel shape for your project.
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