No coins have been made of steel, so you need not worry about it. Coins are copper, gold, brass, silver or some combination. There have even been beads used as coins, rocks, seashells, tobacco through out history. If a coin is attracted to a magnet it's made of a magnetic metal such as steel or nearly pure nickel. The magnet test will eliminate coins made out of silver, gold, bronze, brass, and lower-purity nickel such as U.S. 5¢ pieces. Beyond that you may have to research the specific coin to determine when it was struck, or have what's called a specific-gravity test performed to determine if its density matches that of steel. Steel is being used more and more in making coins because it's inexpensive and readily available. The U.S. only used steel once, in 1943 when cents were made out of steel to save copper for use in ammunition. Other countries such as the UK, Canada, and the EU currently use steel for their low-denomination coins.
The U.S. only made steel cents in 1943. You may have a plated coin (worth nothing extra) or a mint error in which the copper coating wasn't applied to your coin and its zinc core is visible (worth several dollars). You should have it inspected in person by a dealer who works with error coins.
Since there were none minted from steel that year, I would have to assume it is either plated (with silver, zinc, or nickel) which has no collector value, or it was minted on a foreign planchet, which would be worth about $50 You can verify that it is not steel by trying to stick it to a magnet. If it does not stick, then it is not steel.
Steel is made from iron. We combine a small amount of carbon with iron to get (make) steel.
A French coin worth 3 deniers would be a low-value coin from the medieval period. Deniers were the primary currency in France during that time, and a coin worth 3 deniers would have been of small denomination, typically made of copper or silver. The exact value in modern terms would be difficult to determine as it would depend on various factors such as the condition and rarity of the coin.
On a steel press then spot welded together
Indian coin is made of stainless steel.
Most watch cases have on the back the words "made of steel" if they are steel.
steel
It's face value, the coin is still in circulation. The coin is made from zinc not steel, 1943 was the only year the Lincoln cents were made of steel.
steel
Steel cents were only made in 1943. Your coin is plated. It is considered an altered coin and is worth a penny.
The first clue that a penny is made of steel would be that it would stick to a magnet. If not, it can't be made of steel. If it does stick, the coin would have to be authenticated by one of the major grading agencies.
Test it with a magnet. 1943 steel cents are magnetic. 1944 copper cents are not.
From decimalization until 1991, the 1p coin was bronze. From 1992 onwards, it has been copper plated steel.
The only US coin that is magnetic is the 1943 Lincoln cent, it's made from steel.
A 10p coin in the United Kingdom is made of nickel-plated steel.
The 1943 steel penny.