321 Stainless Steel Pipe / Tube — Manufacturer, Price, Specifications
High-quality 321 Stainless Steel Pipe / Tube — direct from factory
What is 321 Stainless Steel Pipe / Tube?
321 stainless steel is stabilized with titanium to prevent intergranular corrosion. It retains good corrosion resistance after prolonged exposure to high temperatures, making it ideal for heat exchangers and boiler components.
321 Stainless Steel Pipe / Tube is one of our most popular products, widely used across various industries including heat exchangers and more.
Our 321 Stainless Steel Pipe / Tube are manufactured to the highest quality standards and come with full Mill Test Certificates (MTC).
Specifications & Dimensions
Seamless and welded stainless steel pipes for industrial, architectural and decorative applications.
Standard Sizes & Weight Chart
Reference sizes and theoretical weights. Custom sizes available upon request.
| Nominal Size | OD (mm) | Wall (mm) | Weight | Note |
|---|---|---|---|---|
| 1/2" Sch 40 | 21.3 mm | 2.77 mm | ~1.28 kg/m | Standard schedule 40 |
| 1" Sch 40 | 33.4 mm | 3.38 mm | ~2.5 kg/m | Standard schedule 40 |
| 2" Sch 40 | 60.3 mm | 3.91 mm | ~5.5 kg/m | Standard schedule 40 |
| 3" Sch 40 | 88.9 mm | 5.49 mm | ~11.5 kg/m | Standard schedule 40 |
| 4" Sch 40 | 114.3 mm | 6.02 mm | ~16.2 kg/m | Standard schedule 40 |
| 6" Sch 40 | 168.3 mm | 7.11 mm | ~28.4 kg/m | Standard schedule 40 |
| 8" Sch 40 | 219.1 mm | 8.18 mm | ~42.5 kg/m | Standard schedule 40 |
Chemical Composition (%)
Chemical composition of 321 grade, in accordance with relevant standards.
| Element | Range / Max |
|---|---|
| Carbon (C) | Max: 0.08% |
| Chromium (Cr) | 17.0 - 19.0% |
| Nickel (Ni) | 9.0 - 12.0% |
| Titanium (Ti) | 5×C% - 0.70% |
| Manganese (Mn) | Max: 2.00% |
| Silicon (Si) | Max: 1.00% |
| Phosphorus (P) | Max: 0.045% |
| Sulfur (S) | Max: 0.030% |
Mechanical Properties
Typical mechanical properties of 321 at room temperature.
| Property | Value |
|---|---|
| Tensile Strength (min) | 515 MPa (75,000 psi) |
| Yield Strength (min) | 205 MPa (30,000 psi) |
| Elongation (min) | 40% |
| Max Operating Temperature | 870°C (1600°F) |
Applications of 321 Steel
321 steel is widely used in the following industries and applications:
- Heat exchangers
- Boiler components and pressure vessels
- Exhaust systems
- Aerospace parts
- Chemical processing vessels
- Welded structures
Why Choose Rubao-Chinasteel as Your Supplier?
Direct Factory Price
We own our manufacturing facilities, ensuring competitive pricing without middlemen markup.
Rigorous Quality Control
Every batch undergoes 3-stage inspection: raw material, production, and final testing with full test reports.
Fast Global Delivery
Standard orders ship within 7-15 days. Well-established logistics network to major ports worldwide.
Custom Processing
Cutting, bending, welding, polishing, and surface treatment available according to your drawings.
Flexible MOQ
Minimum order from 1 ton for standard products. Trial orders welcome for new customers.
24/7 Service
Dedicated sales engineer assigned to each order. Quick response via email, phone, and WhatsApp.
Frequently Asked Questions
What is 321 steel?
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Ready to Get Your Quote?
Send us your specifications and quantity, and we'll reply within 24 hours with a competitive offer.