ASTM A312 TP444 (UNS S44400) Ferritic Stainless Steel Pipes
ASTM A312 TP444 Stainless Steel Pipes (UNS S44400) are high-performance ferritic stainless steel pipes containing high chromium with molybdenum for enhanced resistance to stress corrosion cracking, pitting, and scaling at elevated temperatures. Known for their excellent weldability, high thermal conductivity, and superior corrosion resistance in chloride-rich and mildly acidic environments, TP444 pipes are widely used in heat exchangers, automotive exhaust systems, water heaters, and industrial process piping.
Key Features
- UNS S44400 Ferritic Grade with high corrosion resistance
- Enhanced pitting & crevice corrosion resistance (Mo-stabilized)
- Excellent weldability & formability
- Superior high-temperature oxidation resistance
- Low coefficient of thermal expansion
- Ideal for automotive & heat exchanger applications
- Long service life & cost-effective replacement for 316L
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S44400 |
| EN / DIN | X2CrMoTi18-2 |
| JIS | SUS444 |
| BS | 444S65 |
Available Sizes
-
Outside Diameter: 6 mm to 610 mm
-
Wall Thickness: 0.5 mm to 30 mm
-
Length: 1 m – 12 m (Custom sizes available)
ASTM A312 TP444 Chemical Composition
| Element | Percent (%) |
|---|---|
| Carbon (C) | ≤ 0.025 |
| Chromium (Cr) | 17.5 – 19.5 |
| Nickel (Ni) | ≤ 1.0 |
| Molybdenum (Mo) | 1.75 – 2.5 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Nitrogen (N) | ≤ 0.03 |
| Titanium (Ti) | Stabilized |
| Niobium (Nb) | Stabilized |
| Iron (Fe) | Balance |
ASTM A312 TP444 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength (0.2% Proof) | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness (HRB) | ≤ 96 |
ASTM A312 TP444 Physical Properties
| Property | Value |
|---|---|
| Density | 7.70 g/cm³ |
| Thermal Conductivity | 25 W/m·K (at 100°C) |
| Specific Heat | 460 J/kg·K |
| Electrical Resistivity | 0.75 μΩ·m |
| Melting Range | 1420 – 1510°C |
Types of ASTM A312 TP444 Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- ERW Pipes
- EFW Pipes
- Round, Square & Rectangular Tubes
- Polished Pipes (180–600 grit)
- Annealed & Pickled Pipes
Applications
- Heat Exchangers
- Automotive Exhaust Systems
- Condensers & Coolers
- Industrial Processing Equipment
- Water Heaters & Boilers
- Desalination Plants
- Chemical & Petrochemical Equipment
- Flue Gas Desulfurization Systems
- Food & Beverage Industry
- Structural & Architectural Use
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