Steel cents were struck in 1943, during the depth of WWII, because copper was needed for the war effort.
There's more information at the Related Question.
It really depends on the condition. They are worth about 5 cents if in average circulated condition and have nearly all the plating, only about 2 cents if there are any spots of rust on the coin. The mintmark really doesn't make much of a difference, though the "S" mintmark is the least common of the 3. If the coin is in uncirculated condition, it might be worth about a dollar or two. Beware though, some coins have been replated by private individuals, these coins have no collector value except for 2 cents or so.
The 1970 steel penny is not a genuine US coin as the US Mint did not produce any circulating steel pennies in 1970. Steel pennies were only minted in 1943 due to the shortage of copper during World War II. If you have a 1970 steel penny, it may be altered or counterfeit.
they only made steel pennies in 1943, and only a few accidentally in 1944. the only answer is that someone purposely removed the outer layer of the penny, or it could be an off-metal error coin. To see if it is an error, you should take it to a coin dealer to look at
To determine if a 1943 steel penny is real or fake, you can use a magnet. Steel pennies are magnetic, so if the penny is attracted to the magnet, it is likely authentic. Additionally, you can examine the weight and appearance of the coin compared to known authentic examples. If you are still unsure, consider taking the penny to a professional coin dealer or reputable appraiser for authentication.
Test it with a magnet. 1943 steel cents are magnetic. 1944 copper cents are not.
You can tell if a 1944 penny is made of steel by using a magnet. Place a magnet near the penny - if it sticks, then the penny is made of steel. Steel pennies were issued in 1943 due to a shortage of copper, so any 1944 penny made of steel would be an error.
A 1943 steel penny with no mintmark can be worth $.35 - $1.50
A 1943 steel penny is worth just that 1cent.
No such thing. Steel cents were only minted in 1943.
Average value is 5 to 25 cents.
1943 was the only year for steel cents
No such thing. Steel cents were produced in 1943, not '42.
It's steel, not silver, and it's worth about 5 cents.
it is not rare enough to have any value [will have value in about 3 years]
its value a 1943s is 0.40 1943p is 0.30 1943d is 0.35
Check that coin again. There's no such thing as a 1942 steel cent.
Sorry no steel 1 cent coins dated 1907, only 1943.
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.