Moderator: Hitoru
Raven wrote:I just picked up my HEST F 2.0 T 3..... Incredible blade. Outtand job DPX.
I have a question. What is the Rockwell hardness of the titAnium frame? There is a video on YouTube of an idiot that smashed his HEST F 2.0 a few times with a baton... He mashed the titanium frame lock with only a few hits to a point where the knife no longer locked into place. He said the titanium gave way against the blade steel...how is this even possible ? If titanium is harder than the blade steel, why wouldn't the blade itself suffer damage? Why did the lock give?
The first problem is that he was battoning with a folder....I'm my opinion, that's asking for trouble.
What say you? I have trusted my life to DPX products and will continue to do so as I travel and work in unfriendly dangerous places and environments..I have no doubts.
So back to my original question... What is the Rockwell hardness of the t3's frame?
The other side of the handle is one of the strongest titanium alloys on the market. The 6Al4V GR5 alloy-meaning 6% aluminum, 4% vanadium, Grade 5-is used in surgical implants, turbine blades, and military aircraft fuselages. It’s not the hardest material on earth, but it’s some of the hardest you’ll find in commercial knives.
Titanium Alloys - Ti6Al4V Grade 5
Chemical Formula
Ti6Al4V
Background
This alpha-beta alloy is the workhorse alloy of the titanium industry. The alloy is fully heat treatable in section sizes up to 15mm and is used up to approximately 400°C (750°F). Since it is the most commonly used alloy – over 70% of all alloy grades melted are a sub-grade of Ti6Al4V, its uses span many aerospace airframe and engine component uses and also major non-aerospace applications in the marine, offshore and power generation industries in particular.
The addition of 0.05% palladium, (grade 24), 0.1% ruthenium (grade 29) and 0.05% palladium and 0.5% nickel (grade 25) significantly increase corrosion resistance in reducing acid, chloride and sour environments, raising the threshold temperature for attack to well over 200°C (392°F).
Composition
Table 1. The composition of Ti6Al4V Grade 5.
Content
C <0.08%
Fe <0.25%
N2 <0.05%
O2 <0.2%
Al 5.5-6.76%
V 3.5-4.5%
H2(sheet) <0.015%
H2(bar) <0.0125%
H2(billet) <0.01%
Ti Balance
Key Properties
Physical Properties
Table 2. Typical physical properties for Ti6Al4V.
Property
Typical Value
Density g/cm3 (lb/ cu in)
4.42 (0.159)
Melting Range °C±15°C (°F)
1649 (3000)
Specific Heat J/kg.°C (BTU/lb/°F)
560 (0.134)
Volume Electrical Resistivity ohm.cm (ohm.in)
170 (67)
Thermal Conductivity W/m.K (BTU/ft.h.°F)
7.2 (67)
Mean Co-Efficient of Thermal Expansion 0-100°C /°C (0-212°F /°F)
8.6x10-6 (4.8)
Mean Co-Efficient of Thermal Expansion 0-300°C /°C (0-572°F /°F)
9.2x10-6 (5.1)
Beta Transus °C±15°C (°F)
999 (1830)
Mechanical Properties
Table 3. Typical mechanical properties for Ti6Al4V.
Property
Minimum
Typical Value
Tensile Strength MPa (ksi)
897 (130)
1000 (145)
0.2% Proof Stress MPa (ksi)
828 (120)
910 (132)
Elongation Over 2 Inches %
10
18
Reduction in Area %
20
Elastic Modulus GPa (Msi)
114 (17)
Hardness Rockwell C
36
Specified Bend Radius <0.070 in x Thickness
4.5
Specified Bend Radius >0.070 in x Thickness
5.0
Welded Bend Radius x Thickness
6
Charpy, V-Notch Impact J (ft.lbf)
24 (18)
Fabrication
• Weldability – Fair
• Forging – Rough 982°C (1800°F), finish 968°C (1775°F)
• Annealing - 732°C (1350°F), 4hr, FC to 566°C (1050°F), A.C. F.C. not necessary for bars
• Solution Heat Treating – Forgings
• Ageing – 904-954°C (1660-1750°F), 5 min-2hrs, W.Q. 538°C (1000°F), 4hr, A.C.
Applications
As mentioned previously, this alloy is the most popular of the titanium alloys. It is used for a range of applications in the aerospace, marine, power generation and offshore industries.
Source: Titanium Information Group.
For more information on this source please visit Titanium Information Group.
Date Added: Jul 30, 2002 | Updated: Oct 31, 2011
CDM Titanium and Material Manufactory Articles
Titanium Alloy Selection Guide by CDM Titanium and Materials Manufactory
Titanium Tube and Pipe Specifications, Standards and Applications from CDM Titanium and Material Manufactory
Titanium - Applications
Titanium
Raven wrote:Thank you for the reply. You had a lot of good information. Nutnfancy seemed to almost wreck the knife out of spite. When he said he didn't even know who RYP was and had never even heard of him I knew he was just being a shithead.
RYP wrote: I noticed he loves the $30 RAT folder
RYP wrote:The cheap Taiwanese RAT is a constant best seller. Sometimes you just want a cheap knife with a decent sized handle and blade.
I wouldn't venture into a jungle with one but then again I might let my $5 store bought parang do most of the work and let my HEST folder do the fine cutting work. Its a tool and should be used for whatever the owner deems appropriate.
If you want to buy a $400 Sebenza and cut it in half with a 30 cent hacksaw blade in your mom's basement. You can do that too.
How do I cut an oreo?
I recently made some decorated cupcakes that required oreo halves. I tried several methods:
serrated knife - lots of crumbs, both halves would shatter
plain knife (slowly) - lots of crumbs, both sides of both halves would shatter
plain knife (quickly) - less crumbs, typically one side of one half would shatter
What's the best way to go about cutting my oreos without turning them into a (delicious) crumbly mess?
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