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Titanium - Knife Handle Material

Titanium Info

Description

Titanium is a lightweight, high-strength and corrosion resistant metal that is popular for use in both custom and production knives. It is known on the perodic table as the element Ti.

It is usually alloyed with several different other metals to improve it's strength and other significant properties. The most common alloy used in knifemaking is Ti6Al4V which is an alpha-beta alloy, containing about 6% Aluminum and 4% Vanadium.

In knifemaking, it is commonly used for liners/frames, bolsters, pocket clips, backspacers, standoffs, and occasionally blades. On framelocks it is often the entire handle material. In fact, nearly all high-end custom knifemakers that make liner locks or frame locks use Ti6Al4V for the lock. Knifemaker Warren Thomas frequently use Ti6Al4V for blades as well, using a titanium carbide coated edge for additional cutting power. It can be easily machined and grinded to form various shapes and patterns. It can also be brushed, bead blasted or polished.

Ti6Al4V is the strongest of all the titanium alloys and is the most widely used as well, with applications that range from aerospace to scuba diving.

Anodized Titanium

Titanium can be anodized, creating some brilliant combination of colors. The titanium is placed in an alkaline bath to which electrolytic voltages are passed through it, creating an oxide layer which changes color the longer it is treated. This created some very brilliant colors which are quite common to see on knives, especially customs. The anodizing can wear off.

Composition of Ti6Al4V

C Fe N2 O2 Al V H2
<0.08 <0.25 <0.05 <0.2 5.5-6.76 3.5-4.5 <0.015
Values are shown in percentages. Balance of the elements is Ti.

Titanium Grades Table

Grade Name/Composition Minimum Tensile Strength (ksi) Minimum Proof Stress (ksi) Elastic Modulus (Psi-106)
1 Unalloyed Ti 35A 35 25 14.9
2 Unalloyed Ti 50A 50 40 14.9
3 Unalloyed Ti 65A 65 55 14.9
4 Unalloyed Ti 80A 80 70 15
5 Ti-6Al-4V 130 120 16.4
6 Ti-5Al-2.5Sn 120 115 16
7 Ti-0.15Pd 50 40 14.9
9 Ti-3Al-2.5V 90 70 13.1
10 Ti-11.5Mo-6Zr-4.5Sn 100 90 14.9
11 Ti-0.15Pd 35 25 14.9
12 Ti-0.3-Mo-0.8Ni 70 50 14.9
13 Ti-0.5Ni-0.05Ru 40 25 14.9
14 Ti-0.5Ni-0.05Ru 60 40 14.9
15 Ti-0.5Ni-0.05Ru 70 55 14.9
16 Ti-0.05Pd 50 40 14.9
17 Ti-0.05Pd 35 25 14.9
18 Ti-3Al-2.5V-0.05Pd 90 70 15.3
19 Ti-3Al-8V-6Cr-4Zr-4Mo 115 110 14.9
20 Ti-3Al-8V-6Cr-4Zr-4Mo-0.05Pd 115 110 14.9
21 Ti-15Mo-2.7Nb-3Al-0.25Si 115 110 14.9
23 Ti-6Al-4V ELI 115 110 16.3
24 Ti-6Al-4V-0.05Pd 130 120 16.4
25 Ti-6Al-4V-0.5Ni-0.05Pd 130 120 16.4
26 Ti-0.1Ru 50 40 14.9
27 Ti-0.1Ru 35 25 14.9
28 Ti-3Al-2.5V-0.1Ru 90 70 13.1
29 Ti-6Al-4V-0.1Ru 120 110 16.3

Titanium Examples