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Titanium Information & Composition

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AKS Titanium Grades
We separate titanium sheet and plate into two grades. The grades refer to the quality of the titanium, not the alloy or composition of the titanium. Our two grades are Knifemaker Grade and Standard Grade.

Knifemaker Grade
This is the highest quality available. This means the titanium is flat with no gouges on the surface. Our definition of flat means if a piece has a slight bend you can hold the piece by one corner and gravity will pull the bend straight. We surface condition the titanium to remove the ink from the mill. We found nasty gouges under the ink. This allows us to see any imperfections in the surface. The surface conditioner also leaves a nice surface finish. We round the corners and bevel the edges. Knifemaker Grade titanium is the best available titanium.

Standard Grade
This is the average everyday titanium that is available everywhere. It sometimes has slight bends, scratches and blemishes on the surface. This is the titanium to use when appearance is not an issue or cost is an issue.


Titanium Alloys

   Type      Element     Percentage     Description  
CP-1
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
0.20%
0.18%
0.08%
0.03%
0.01%
Balance
This titanium alloy is also known as Grade 1. Commercially pure titanium, CP-1 has lowest strength, and is the softest, least alloyed Ti grade with highest ductility, cold formability and impact toughness. It is not a good material for liner locks but works well for overlays or bolsters.

Tensile Strength: 35,000, Yield Strength (0.2% offset): 25,000

CP-2
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
0.30%
0.25%
0.08%
0.03%
0.01%
Balance
This titanium alloy is also known as Grade 2. Commercially pure titanium. The are four CP alloys, CP-1 through CP-4. CP-1 has lowest strength, and is the softest, unalloyed Ti grade with highest ductility, cold formability and impact toughness.

It is not a good material for liner locks but works well for overlays or bolsters.

Tensile Strength: 50,000, Yield Strength (0.2% offset): 40,000

CP-3
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
0.30%
0.35%
0.08%
0.05%
0.01%
Balance
This titanium alloy is also known as Grade 3. Commercially pure titanium. The are four CP alloys, CP-1 through CP-4. CP-1 has lowest strength, and is the softest, unalloyed Ti grade with highest ductility, cold formability and impact toughness.

It is not a good material for liner locks but works well for overlays or bolsters.

Tensile Strength: 65,000, Yield Strength (0.2% offset): 55,000

CP-4
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
0.50%
0.40%
0.08%
0.05%
0.01%
Balance
This titanium alloy is also known as Grade 4. Commercially pure titanium. The are four CP alloys, CP-1 through CP-4. CP-1 has lowest strength, and is the softest, unalloyed Ti grade with highest ductility, cold formability and impact toughness.

It is not a good material for liner locks but works well for overlays or bolsters.

Tensile Strength: 80,000, Yield Strength (0.2% offset): 70,000

3-2.5
Aluminum:
Vanadium:
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
3.00%
2.50%
0.25%
0.15%
0.08%
0.03%
0.01%
Balance
This titanium alloy is also known as Grade 9. It is used in high temperature conditions where 6-4 would fail. The alloy anodizes similar to 6-4. It cracks and/or breaks when bent at sharp angles.

Tensile Strength: 130,000, Yield Strength (0.2% offset): 120,000

6-2-4-2
Aluminum:
Tin:
Zirconium:
Molybdenum:
Iron:
Oxygen:
Silicon:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
6.00%
2.00%
4.00%
2.00%
0.25%
0.15%
0.10%
0.08%
0.05%
0.01%
Balance
This titanium alloy is also known as 6242. It is used in high temperature conditions where 6-4 would fail. The alloy anodizes similar to 6-4. It cracks and/or breaks when bent at sharp angles.

In my opinion it grinds easier and polishes better. Every knifemaker who purchased 6242 (except one) likes it. It is part of the 6-4 family.

Tensile Strength: 130,000, Yield Strength (0.2% offset): 120,000

6-4
Aluminum:
Vanadium:
Iron:
Oxygen:
Carbon:
Nitrogen:
Hydrogen:
Titanium:
6.00%
4.00%
0.40%
0.20%
0.08%
0.05%
0.01%
Balance
This titanium alloy is also known as 6AL4V, 64 or Grade 5. This alloy is the most commercially available titanium alloy. It offers an excellent combination of high strength, toughness, and ductility along with good weldability and fabricability. It is the "workhorse" of the aerospace industry.

Tensile Strength: 130,000, Yield Strength (0.2% offset): 120,000

6-6-2
Aluminum:
Vanadium:
Tin:
Copper:
Iron:
Titanium:
6.00%
6.00%
2.00%
0.50%
0.50%
Balance
This titanium alloy is also known as 662. It has improved strength compared with 6-4, but with lower toughness and ductility, and limited weldability.

Tensile Strength: 150,000, Yield Strength (0.2% offset): 140,000

10-2-3
Vanadium:
Iron:
Aluminum:
Oxygen:
Nitrogen:
Carbon:
Hydrogen:
Titanium:
10.00%
2.00%
3.00%
0.13%
0.05%
0.05%
0.01%
Balance
This titanium alloy was developed primarily for high-strength applications to provide weights savings over steels in airframe forging applications. The alloy also possesses the best hot-die forgeability of any commercial titanium alloy.

Tensile Strength: 173,000, Yield Strength (0.2% offset): 160,000

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