Stainless Steel 321H Pipes bring better creep strength than 321 to your projects. GXH Steels supplies these pipes for demanding industrial applications where standard grades fall short.
What Is Stainless Steel 321H?
Grade 321H stainless steel belongs to the Austenitic family. It contains 18% Cr, 10% Ni, Ti, higher carbon. This composition gives the material its better creep strength than 321.
GXH Steels manufactures Stainless Steel 321H Pipes to meet ASTM and international standards. Each pipe goes through quality checks before shipping.
For applications needing standard carbon, Stainless Steel 321 Pipes provide an excellent choice.
Key Features
Here’s what sets Stainless Steel 321H Pipes apart:
- Corrosion Resistance – For prolonged high-temperature service.
- Temperature Performance – Rated for service up to 870°C continuous.
- Material Composition – Contains 18% Cr, 10% Ni, Ti, higher carbon for balanced properties.
- Quality Assurance – Every batch includes mill test certificates and documentation.
Projects requiring niobium-stabilized may also benefit from Grade 347H Pipes.
Stainless Steel 321H Pipes Chemical Composition
The chemical composition of Grade 321H stainless steel per ASTM/AISI standards:
| Element | Composition (%) |
|---|---|
| C | 0.04-0.10 |
| Mn | 2.00 |
| Si | 0.75 |
| P | 0.045 |
| S | 0.030 |
| Cr | 17.0-19.0 |
| Ni | 9.0-12.0 |
| Ti | 4xC-0.70 |
Stainless Steel 321H Pipes Mechanical Properties
Mechanical properties of Grade 321H in annealed condition:
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa (74694 psi) |
| Yield Strength (0.2%) | 205 MPa (29732 psi) |
| Elongation (in 50mm) | 40% |
| Hardness | 183 HB (Brinell) |
Stainless Steel 321H Pipes Physical Properties
Physical characteristics of Grade 321H stainless steel:
| Property | Value |
|---|---|
| Density | 7.92 g/cm³ |
| Melting Range | 1400-1425°C |
| Thermal Conductivity (at 100°C) | 16.1 W/m·K |
| Specific Heat | 500 J/kg·K |
| Electrical Resistivity | 72 μΩ·cm |
| Thermal Expansion (20-100°C) | 16.6 μm/m·°C |
Available Sizes and Dimensions
GXH Steels supplies Stainless Steel 321H Pipes in the following size range:
| Specification | Range |
|---|---|
| Nominal Pipe Size | 1/8″ to 24″ NPS (DN6 to DN600) |
| Wall Thickness | 0.5mm to 50mm |
| Length | Up to 12 meters (random or fixed) |
| Schedules Available | 5S, 10S, 40S, 80S, SCH 10, SCH 40, SCH 80, SCH 160, XXS |
Applicable Standards
Stainless Steel 321H Pipes conform to these industry standards:
- Seamless Pipes: ASTM A312, ASTM A213, ASTM A269
- Welded Pipes: ASTM A312, ASTM A358, ASTM A409
- Tubes: ASTM A213, ASTM A249, ASTM A269
- General: EN 10088, JIS G4304/G4305
Applications
Stainless Steel 321H Pipes work well for:
- High-temperature pressure vessels
- Superheater tubes
- General industrial piping
- Power generation industry installations
Benefits
Choosing Stainless Steel 321H Pipes saves you money on replacements and downtime. The material handles high-temperature pressure vessels and superheater tubes conditions without degrading quickly. You get pipes that perform as expected, backed by GXH Steels’s technical support.
Why GXH Steels?
GXH Steels has supplied stainless steel products to power generation and petrochemical sectors for years. Our team knows the technical details of each grade. We help you pick the right specification for your project and provide documentation for your quality requirements.
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