Gr1 titanium tube heat treatment process can be summarized as:
(1) solution treatment and aging: the purpose is to improve its strength, α titanium tubes and stable β titanium tubes can not be strengthened heat treatment, in the production of only annealed. α + β titanium tubes and contain a small amount of α-phase sub-stable β titanium tubes can be solid solution treatment and aging to make the alloy further strengthened.
(2) complete annealing: the purpose is to obtain good toughness, improve machinability, facilitate re-machining as well as improve the stability of size and organization.
(3) Stress relief annealing: the purpose is to eliminate or reduce the residual stress generated during processing. Prevent chemical attack and reduce deformation in some corrosive environments.
In addition, in order to meet the special requirements of the workpiece, industrial titanium tubes also use double annealing, isothermal annealing, beta heat treatment, deformation heat treatment and other metal heat treatment processes.
TITANIUM ALLOYS GR 1 PIPES & TUBES CHEMICAL COMPOSITION
| C | Fe | H | N | O | Ti |
|---|---|---|---|---|---|
| max | max | max | max | max | max |
| 0.1 | 0.2 | 0.015 | 0.03 | 0.18 | 99.5 |
GRADE 1 TITANIUM PIPES & TUBES OF MECHANICAL PROPERTIES
| Hardness, Brinell | 120 | 120 | annealed |
|---|---|---|---|
| Hardness, Knoop | 132 | 132 | Estimated from Brinell. |
| Hardness, Rockwell B | 70 | 70 | annealed |
| Hardness, Vickers | 122 | 122 | Estimated from Brinell. |
| Tensile Strength, Ultimate | 240 MPa | 34800 psi | |
| Tensile Strength, Yield | 170 - 310 MPa | 24700 - 45000 psi | |
| Elongation at Break | 24 % | 24 % | |
| Reduction of Area | 35 % | 35 % | |
| Modulus of Elasticity | 105 GPa | 15200 ksi | In Tension |
| Compressive Modulus | 110 GPa | 16000 ksi | |
| Poisson's Ratio | 0.37 | 0.37 | |
| Charpy Impact | 310 J | 229 ft-lb | V-notch |
| Shear Modulus | 45 GPa | 6530 ksi |
PHYSICAL PROPERTIES OF GRADE 1 TITANIUM ALLOY PIPES AND TUBES
| Physical Properties | Metric | English |
|---|---|---|
| Density | 4.51 g/cc | 0.163 lb/in³ |
