ASTM F136 Titanium medical rod 3mm 4mm 5mm 6mm 8mm 10mm gr5eli gr23 titanium bar

ASTM F136 Titanium medical rod 3mm 4mm 5mm 6mm 8mm 10mm gr5eli gr23 titanium bar

1. Advantage:

     Titanium alloy is an alloy composed of titanium added with other elements. Titanium has two kinds of heterogeneous crystals: below 882 ℃ is a close-packed hexagonal structure α titanium, above 882 ℃ is a body-centered cubic β titanium. According to their influence on the phase transition temperature, alloying elements can be divided into three categories: ①stabilizing the α phase and increasing the phase transition temperature are α stable elements, including aluminum, carbon, oxygen and nitrogen. Among them, aluminum is the main alloy element of titanium alloy, which has a significant effect on improving the normal temperature and high temperature strength of the alloy, reducing the specific gravity, and increasing the elastic modulus.

②The element that stabilizes the β phase and lowers the phase transition temperature is the β stable element, and can be divided into two types: isomorphic and eutectoid. The former has molybdenum, niobium, vanadium, etc .; the latter has chromium, manganese, copper, iron, silicon, etc.

③The elements that have little effect on the phase transition temperature are neutral elements, such as zirconium and tin.
Oxygen, nitrogen, carbon and hydrogen are the main impurities of titanium alloys. Oxygen and nitrogen have greater solubility in the α phase, which has a significant strengthening effect on titanium alloys, but reduces the plasticity. It is generally specified that the content of oxygen and nitrogen in titanium is below 0.15 to 0.2% and 0.04 to 0.05%, respectively. The solubility of hydrogen in the α phase is very small. Too much hydrogen dissolved in the titanium alloy will produce hydride and make the alloy brittle. Usually the hydrogen content in titanium alloys is controlled below 0.015%. The dissolution of hydrogen in titanium is reversible and can be removed by vacuum annealing.

Technical requirements
1: The chemical composition of titanium and titanium alloy bars shall comply with the provisions of GB / T 3620.1, and when repeated inspection is required, the allowable deviation of the chemical composition shall comply with the provisions of GB / T 3620.2.
2: The diameter or side length of the hot-processed bar and its allowable deviation should meet the requirements of Table 1.
3: After hot working, the diameter of the cold-drawn bar and the cold-rolled bar (ground) and cold-rolled bar should be in accordance with the requirements of Table 2.
4: The out-of-roundness of the bar after turning (grinding) after hot processing should not be greater than half of its dimensional tolerance.
5: The length of the indeterminate length of the processed bar is 300-6000mm, and the length of the annealed bar is 300-2000mm. The length of the fixed length or multiple length should be within the length of the indefinite length. The allowable deviation of the fixed length is + 20mm ; The length of the double ruler should also be included in the cut amount of the bar, each cut amount is 5mm. The fixed ruler or double ruler length should be indicated in the contract.

2. Chemical requirements

3. Physical Properties

4. Tolerance