ASTM A312 TP309H Austenitic Stainless Steel Pipes
ASTM A312 TP309H Stainless Steel Pipes are high-temperature austenitic stainless steel pipes designed for excellent resistance to oxidation, scaling, and carburization at elevated temperatures. With a higher carbon content compared to TP309, TP309H offers enhanced high-temperature creep strength, making it ideal for furnace components, heat exchangers, and petrochemical processing equipment.
These pipes are widely used in industries where durability, corrosion resistance, and heat tolerance are essential.
Key Features
- High Carbon Variant (H Grade) for superior high-temperature strength
- Excellent Oxidation & Scaling Resistance up to 1093°C
- Superior Creep & Stress Rupture Strength
- Good Weldability & Fabrication Properties
- Corrosion Resistance in Oxidizing Environments
- Ideal for Furnace, Heat Treatment & Petrochemical Applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | TP309H |
| UNS | S30909 |
| EN / DIN | X15CrNiSi20-12 (1.4828) |
| JIS | SUS309H |
Available Sizes
- Outside Diameter (OD): 6 mm – 610 mm
- Wall Thickness: 1 mm – 60 mm
- Pipe Type: Seamless, ERW, EFW, Fabricated
- Length: Up to 12 meters
ASTM A312 TP309H Chemical Composition
| Element | Content (%) |
|---|---|
| C | 0.04 – 0.10 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Cr | 22.0 – 24.0 |
| Ni | 12.0 – 15.0 |
| N | ≤ 0.10 |
| Fe | Balance |
ASTM A312 TP309H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% Proof) | ≥ 290 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 192 HB |
ASTM A312 TP309H Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Range | 1398 – 1454°C |
| Thermal Conductivity (100°C) | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Specific Heat | 500 J/kg·K |
| Coefficient of Expansion | 15.3 µm/m°C (20–100°C) |
Types of ASTM A312 TP309H Pipes
- Seamless Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Cold Drawn Pipes
- Hot Finished Pipes
- Polished Pipes (180 / 240 / 320 / 600 Grit)
- Fabricated Pipes
Applications
- Heat Exchangers
- Furnace Parts & Heat Treatment Equipment
- Petrochemical Processing
- Power Generation
- Boiler & Superheater Tubes
- High-Temperature Structural Applications
- Kiln Linings & Burner Parts
- Refinery & Chemical Processing Units
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