ASTM B861 Grade H
ASTM B861 Grade H Titanium Pipe (Grades 2H, 7H, 16H, 26H)
ASTM B861 Grade H covers high-strength titanium seamless pipe produced to tighter mechanical requirements than standard ASTM B861 grades. Grade H includes 2H (UNS R50400), 7H (UNS R52400), 16H (UNS R52402), and 26H (UNS R56320), offering enhanced tensile and yield strength while maintaining excellent corrosion resistance, low density, and long service life. These pipes are widely used in pressure systems, chemical processing, and critical industrial environments.
Key Features
Higher mechanical strength than standard ASTM B861 grades
Excellent corrosion resistance in oxidizing and reducing media
Lightweight with high strength-to-weight ratio
Good weldability and fabrication characteristics
Suitable for pressure and high-performance applications
Specification
| Parameter | Details |
|---|---|
| Standard | ASTM B861 |
| Product | Seamless Titanium Pipe |
| Grades | 2H, 7H, 16H, 26H |
| Manufacturing | Seamless |
| Heat Treatment | As per ASTM B861 Grade H requirements |
| Surface Finish | Pickled, Annealed, Polished |
| Form | Round Pipe |
Equivalent Grades
| ASTM B861 Grade H | UNS Number | Common Description |
|---|---|---|
| 2H | UNS R50400 | CP Titanium Grade 2H (High Strength) |
| 7H | UNS R52400 | Titanium Grade 7H (Pd-alloyed CP Ti) |
| 16H | UNS R52402 | Titanium Grade 16H (Low Pd CP Ti) |
| 26H | UNS R56320 | Titanium Grade 26H (Ti-6Al-4V-Pd Alloy) |
Sizes
Outside Diameter (OD): 6 mm to 219 mm (1/8” to 8”)
Wall Thickness: 0.5 mm to 20 mm
Length: Random, Double Random, or Cut Length
Schedules: SCH 5S to SCH XXS (as applicable)
Chemical Composition
| ASTM B861 Grade H | UNS Number | Common Description |
|---|---|---|
| 2H | UNS R50400 | CP Titanium Grade 2H (High Strength) |
| 7H | UNS R52400 | Titanium Grade 7H (Pd-alloyed CP Ti) |
| 16H | UNS R52402 | Titanium Grade 16H (Low Pd CP Ti) |
| 26H | UNS R56320 | Titanium Grade 26H (Ti-6Al-4V-Pd Alloy) |
Mechanical Properties
| Grade | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| 2H | Higher than Grade 2 | Higher than Grade 2 | ≥20% |
| 7H | Higher than Grade 7 | Higher than Grade 7 | ≥18% |
| 16H | Higher than Grade 16 | Higher than Grade 16 | ≥18% |
| 26H | ≥930 MPa | ≥860 MPa | ≥10% |
Physical Properties
| Property | Value |
|---|---|
| Density | 4.5 g/cm³ |
| Melting Point | ~1668°C |
| Thermal Conductivity | 16–22 W/m·K |
| Modulus of Elasticity | ~105 GPa |
Types
Seamless Round Titanium Pipe
Annealed Titanium Pipe
Pickled / Polished Titanium Pipe
Custom Cut-Length Pipes
Applications
Chemical & petrochemical processing equipment
Heat exchangers and condensers
Pressure piping systems
Offshore and marine environments
Power generation and desalination plants
Aerospace and high-performance industrial systems