Titanium can be strong, small, light and thin

The specific strength of the titanium alloy is the maximum in the practical metal

"Titanium is strong", but it must be considered separately from pure titanium and titanium alloy.
(Or, it is necessary to think about pure titanium and titanium alloy separately for problems other than strength.)
Clearly, these two are different things.

Pure titanium is classified according to JIS standard into 4 types according to the content of its component (mainly oxygen content).
Very simply saying, the one with low oxygen content is 1 → 4, and the tensile strength rises in that order, but the elongation and the iris decrease.

The pure titanium JIS 1 kind has a tensile strength of 270 to 410 (N / mm ² ), which is the same as SS 400 of rolled steel for general structure. Or rather it is weak.
For SS 400, the first S is Steel, the next S is Structure, and 400 is the minimum tensile strength. It is about the same as SS 400 with pure titanium JIS 2 species.

Even when only the tensile strength is observed, it is 895 (N / mm ² ) or more (JIS 60 species) and this is more than the SS 400 when it is a titanium alloy (for example, it is considered as the most popular Ti - 6Al - 4V in titanium alloy ) It becomes stronger.

When returning the story to pure titanium (2 kinds), since the tensile strength is the strength per unit area, the same cross sectional area (= the same size) can be used to give the same strength as the product of the SS 400 material is. At this time, since the density of pure titanium is about 60% of that of iron, the weight of actual titanium products is about 60% of that of conventional products.

When this is made of Ti - 6Al - 4V, it can be reduced to less than half of the cross - sectional area.
Then, depending on the design shape, if the cross-sectional area is assumed to be 1/2, the length becomes 1 / √ 2, so the volume becomes about ⅓. When the volume becomes 1/3, the density is about 60%, so we can make it weigh one fifth of the original item.

It's quite amazing, is not it?
This characteristic that the density is low in proportion to the strength is the reason why it is said that titanium alloy boasts the highest class specific strength in practical metals. If you want to make things with titanium with the same weight as the product, you can enlarge the volume even with pure titanium (2 types), so you can obviously enlarge the cross section so that you can make it stronger .

But it is natural to get bigger, thicker and stronger, so it is not necessary to use anything titanium, is not it? If you are going to bother to purposely use titanium, you can make it smaller, thinner, lighter and still less I think that strength increases. Is not it?
Then, let's use a titanium alloy. Titanium alloy will meet your expectations.

Let's see an example where titanium and titanium alloy are actually used (mainly) for strength. Jet engine, deep sea pressure shell, screw · tool, bicycle, wheelchair, turbine blade, connecting rod (rod connecting piston and crankshaft), engine valve, outdoor goods.

However, I will notice that there is something when I see it all the way. That means that using titanium is not about asking for strength only. For example, jet engines and other turbine blades are components that require strength as well as strength. If the turbine blade that rotates at high speed is heavy ... ... It can be a terrible thing that the blade will fly apart in pieces.

As for the deep ocean pressure resistant nucleus, corrosion resistance is naturally required, and it is also important that light weight is required as heavy and volumes to earn buoyancy for balancing with it are required.

It is very important for reducing fatigue of workers that tools and the like are light. It goes without saying that weight reduction is also very important for bicycles and wheelchairs. For connecting rods and engine valves, weight saving is also a very important point. Let's take a closer look at connecting rods and engine valves.

As you all know, the gasoline engine rotates at an extremely high speed. It will not be 6000 rpm. But it's 6000 rpm, it's about 6000 revolutions per minute? That means that it will go 100 times per second? That means that the engine valve reciprocates 50 times per second, and the connecting rod goes back and forth 100 times per second.

You often move at such a speed.
Because it is such a part, the lighter one can greatly reduce the "power to spare a connecting rod etc". The area that supports them can also be made smaller, so you can make it smaller and thinner. That means that friction also decreases.

As a result, the engine can use it for advancing etc. without much loss of energy generated by explosion.
Also, if the engine, which is the heaviest parts in the car body, gets lighter, the structural parts that support it can also reduce the strength and get stuck well when you apply the brakes.

Since weight ratio before and after also improves, it will be easy to handle.
Well, that's a good idea.

However, it is commonplace that it does not mean that anything is fine.
Because minimum strength is required, titanium alloy is perfect.

However, there is a weak point that titanium has poor abrasion resistance. Therefore, abrasion resistance treatment (molybdenum spraying etc.) is applied to the part rubbing with other metal. Besides, I think that there are many cases where it is beneficial to be able to lighten without losing strength. Also, if made from titanium, other valuable properties such as corrosion resistance will follow!

You wish "I wish I could use titanium here!"
If you are troubled with processability etc., please consult with us. I will help you.

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