I was wondering, does anyone know of this mystery steel system called "triple hardness steel" ? I was trying to find information on it like layout and hardness (BHN or VHN) but i could not find anything concrete on it anywhere. Although it gets mentioned in the AFV community fairly regularly, I can not find it anywhere. If anyone knows, please share it. Thanks in advance !
versus 12.7 mm APM2, Em of 1.23-1.62
By Must Be Spoon Fed
I'm interested in Soviet armor production and deployment. Especially of T-55 tank and its variants. Sadly, most sources touch this subject very generally while I would want to get a more detailed view. How much tanks were produced in which country and at what year. Were Soviets producing armor for themselves or for export. Any source which would go into bit more detail about it is appreciated. I would appreciate if someone could help me find information required about those tanks as so far I can rely only on quite general information.
I want to calculate the weight required to make an armor that can resist 7.62 RUAG SWISS AP, also known as VPAM level 12. I needed a baseline so I took NIJ Level IV and then tried to find the difference of weight so I could get a percentage. The only plate that's still made for this threat is the TenCate CX-950 IC. This plate is 8.93 lbs for a sapi medium and is alumina in-conjonction with soft armor. I then needed to find a Level IV alumina IC, which I found on UARM's website. It's 7.6 lbs, so if we do 8.93/7.6 we get around 1.175, but I put 1.25 considering UARM's plates are often quite heavy. Now that we have 1.25, we can start applying it to silicon carbide and boron carbide. Denmark's group has a level IV silicon carbide plate at 5.95 lbs, so times 1.25 it gives 7.4375. Hesco's boron carbide IV plate is 5.1 lbs, so times 1.25 we get 6.375.
Now, I wanted to know what was the weight for hardened steel. I took MARS 600, which is one of the best armor steel you can get. Using this page, I can easily calculate that you would need about 19mm to stop it. Using a calculator, we know that a full inch sapi medium plate would weight 33.9 lbs. 19mm/25.4mm = 0.748 inch so if we do 0.748*33.9 we get 25.3572 lbs.
The problem is obvious : How is boron carbide 4 times as light as steel? Silicon carbide is 3.4 times as light too? It doesn't make any sense, giving that they are both around 2.2 ME and hardened steel is 1.3 ME, so it should be around 1.7 times heavier for steel. What did I get wrong?