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Depending on what test you are talking about...
Hardness can be tested by a device that divots the metal with a calibrated point and measures the force required to make a certain depth divot. Also it can be roughly tested by a set of files that have varying hardness. If the file cuts the steel, its harder than the steel.
Structure testing (checking for cracks) can be done by a process called "Magnaflux" which creates a magnetic field in the piece, and filings are sprinkled on it. The filings will indicate the place where the crack is, because the crack makes opposing poles of magnetism in the piece. Another way is called "Dye Penetrant" in which a fluorescent dye is introduced to the surface of the metal and allowed to penetrate the cracks. The rest is washed off with a solvent, which can't remove the dye in the cracks, which show up under black light.
There are literally thousands of tests that can be carried out on a piece of steel, so its hard to answer this generic question, but those are the two most common practical tests I can think of.
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By the ability of the material of carbon steel, its called as IMPACT tested carbon steel
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how is steel tested to make sure it is safe to use
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By the ability of the material of carbon steel, its called as IMPACT tested carbon steel
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It is tested for silver nitrate sometime. It is tested for silver nitrate sometime. It is tested for silver nitrate sometime.
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