[fuwei]

Hello guys....
Recently, we can see many house-breaking case happened. Most of the case is caused by the cutting of metal gate by the burglars.
Is it possible to modify metal into unbreakable state so that metal cannot be cut by burglars to reduce the case ?

[enahs]

There are various steals out that are so strong, unless you have a powered diamond tipped drill (which will make a lot of noise), it will take hours to cut through. They are expensive and heavy though.

[Borek]

Various steals? That reaminds me of

Q: Explain briefly why a steel ship floats, but a steel bar sinks.
 
A: A steal sheep is hollow, but a still bear isn't.

[enahs]

  Sorry, I do not know how to read or write.
For fuwei, or non-native English speaking friend, I meant to say steel (http://en.wikipedia.org/wiki/Steel)

[fuwei]

Dear enahs,
enahs, i don't really understand what enahs wrote.
Powered diamond tipped drill is a tool, isn't it ? How can it be cut through ? Instead my question is how to modify metal into unbreakable state.
Can you please once again explain to me clearly ?
Sorry for disturbing once again. ^^
Thank you.

Fuwei

[ARGOS++]

Dear Fuwei;

Diamond is till yet the hardest material we know.
As you may know that a harder material can mechanical “destroy” any other that’s less hard.
Today there is no method known how you can “hardening” Steel or other metal to protect it against a drill containing Diamonds on its top.
Yes the drill means in this case a toll/engine you make holes into other material, and with industrial diamonds on its top you can drill holes in all that is of less or the same hardness.

You may read also under: "Hardness”

Conclusion:  I don’t see any real chance for your project; - Sorry!


Good Luck!
                   ARGOS⁺⁺

[constant thinker]

The trick is not to make it unbreakable, but to make so hard to cut through that it isn't worth the time or effort.

[Yoritomo]

Hello!

        Today there are steels(hardened) on the market hard as 8 on Mohs scale of hardness.Diamond is the hardest NATURAL material-crystalic compound we know,having a 10 at Mohs scale.A Corundum or Carbid drill or disc can cut this steel,no need to use expensive diamond drill...

      Mohs formed his scale of Hardness by scratching different mineral specimens(naturally crystalized compounds...).When a mineral can scratch a second,different mineral,then the first mineral is harder than the second one.

         Breakage and scratching(or respectively cutting) are two different processes.A Quartz may be very hard (7 at Mohs) but it breaks very easily.It depends on elasticity of the material.

          Making steel harder usually makes it more brittle-this was the problem of swordsmiths back at the Middle Ages.

          Now,if your problem is avoiding burglars,then all this conversation is only educative.Better locks help,of course,but they do not guarantiee your house will be 100% safe.Just imagine that bank s and casinos can be burglarized,although they have the most modern and effective security systems.

         There are high quality locks on the market and they are not too expensive.This will save you from neighboarhood "rats" that may break into your house.They will not stop a more "educated burglar.

         If you have expensive stuff in your house,and it's worthy the cost,then a good way is to provide yourself a good alarm system and employ a security company.Again,a proffetional burglar can beak in by disabling the alarm system,but this goes too far...

          If you are still interested in how steel can be hardened,please give it a search in Google and I assume you may find several articles,it's a literally ancient technique.It involves heating and rapid cooling high carbon Iron ore,forcing the formation of hard crystals inside the metal.


           Hope I helped!
                   -Kostas.
           

         

         

[billnotgatez]

Locks keep the honest people from going astray.

[Alpha-Omega]

Guess my metallutgical engineering background good for something...just cannot resist this one. 

Whoever wrote the last statemnet...good explanation...and it is the carbon content in steel that does give it it strength and physical properties...it is the carbon content that was in the hull of the Titanic which made is suceptible to shattering/fracture in the cold arctic waters....3%-9%is used to manipulate hardness.

High-Carbon Steel
Steel with more than 0.3% carbon. The more carbon that is dissolved in the iron, the less formable and the tougher the steel becomes. High-carbon steel's hardness makes it suitable for plow blades, shovels, bedsprings, cutting edges, or other high-wear applications.


Vickers, Brinell, Rockwell, and ... Hardness Scales are most common for steel.  Here is a list of those values:  http://www.mesteel.com/cgi-bin/w3-msql/goto.htm?url=http://www.mesteel.com/info/carbon/hardness_table.htm

High Strength Low Alloy (HSLA)
A specific group of steels in which the strength levels are achieved by the addition of moderate amounts of alloying elements.  The most common are columbium, vanadium or titanium.

Hematite
The oxide of iron of highest valency which has a composition close to the stoichiometric composition Fe2O3.

High Brass
65% - A copper-zinc alloy containing 35% zinc. Possesses high tensile strength and is used for springs, screws, rivets, etc.



HAVE A NICE DAY....thanks for the review...OH and ADT is your best bet...and it comes with a remote control...a keyless remote...


Hardness is the degree to which a metal will resist cutting, abrasion, penetration, bending and stretching. The indicated hardness of metals will differ somewhat with the specific apparatus measuring hardness. (See Brinell Hardness, Rockwell Hardness, Vickers Hardness, Scleroscope Hardness). Tensile Strength also is an indication of hardness.

Hardening

WHAT
Process that increases the hardness of steel, i.e., the degree to which steel will resist cutting, abrasion, penetration, bending, and stretching.
 
WHY
The increased endurance provided by hardening makes steel suitable for additional applications.
 
HOW
Hardening can be achieved through various methods, including (1) heat treatment, where the properties of steel are altered by subjecting the steel to a series of temperature changes; and (2) cold working, in which changes in the structure and shape of steel are achieved through rolling, hammering, or stretching the steel at a relatively low temperature.

High Strength
Product intended for applications where greater strength is critical.  High Strength typically begins at 35 ksi minimum yield strength.

[mnakhla]

i once read about an iridium padnium ..and somthing eles ..sorry i seem to have forgetten...alloy that had been discovered...that they wanted to place in hip replacements and it was to have other uses...they alloy is very difficult to break and whenever it is impacted by somthing the molecules reform themselves into a stronger crystaline formation....thereby making it strong each time it was impacted...it was in my physics book a couple of years...or was it three...years back....but it was in an 11th grade text book...