In high-stakes industrial environments, thermal expansion and corrosive exhaust can quickly degrade standard piping. You need a material that refuses to compromise its integrity under fire and that will be our SS 321 Welded Pipes.
What makes 321 welded pipes unique is the addition of Titanium. In standard stainless steels, high-temperature welding can cause “sensitization,” where chromium carbides form and leave the metal vulnerable to rust. By incorporating Titanium into the alloy, we ensure that the carbon bonds with the Titanium instead of the Chromium. This “stabilization” keeps the Chromium distributed evenly throughout the pipe, protecting your system from intergranular corrosion at temperatures up to 815°C.
Chemical Properties of Stainless Steel 321 Welded Pipes:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.08 |
| Chromium (Cr) | 17.0-19.0 |
| Nickel (Ni) | 9.0-12.0 |
| Titanium (Ti) | 5×C min (≥0.40 typical) |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤0.75-1.00 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Iron (Fe) | Balance |
Mechanical Properties of 321 SS Welded pipes:
| Property | Value (Min) |
|---|---|
| Tensile Strength | 515 MPa (75 ksi) |
| Yield Strength (0.2%) | 205 MPa (30 ksi) |
| Elongation (in 50mm) | 40% |
| Hardness (Rockwell B) | ≤95 HRB |
| Hardness (Brinell) | ≤217 HB |
Physical Properties of 321 Welded Pipes:
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1398-1440°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity (100°C) | ~16.2 W/m·K |
| Electrical Resistivity | ~72 μΩ·cm |
| Coefficient of Thermal Expansion | 16.5 × 10⁻⁶ /K |
| Specific Heat Capacity | 500 J/kg·K |
Product Specifications:
| Specification | Details |
|---|---|
| Steel Grade | SS 321 |
| Unit Pipe Length | 6 meter, 9 meter |
| Shape | Round |
| Min. Order Quantity | 200 Kilogram |
Critical Applications for 321:
Due to their excellent high-temperature resistance and corrosion protection, 321 welded pipes are used in numerous industrial sectors.
- Petrochemical processing plants
- Oil and gas industries
- Heat exchangers and boilers
- Aerospace and aircraft components
- Power generation plants
- Chemical processing industries
- Thermal processing equipment
- High-temperature industrial piping systems
The durability of SS 321 welded pipes makes them suitable for critical applications where stability and corrosion resistance are essential.
In the critical temperature range of 427°C to 816°C , there is no room for metallurgical compromise. Choosing the right Stainless steel 321 welded pipes is the difference between a system that thrives under thermal stress and one that falls victim to intergranular corrosion.
At Salem Stainless Steel Suppliers we specialize in the precision manufacturing of titanium-stabilized alloys. Our process-from the selection of premium skelp to the final longitudinal weld-is designed to ensure that the “outside periphery” and wall thickness of every pipe we produce meet the most stringent international standards.
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