Silicon steel and manganese steel are sometimes classed as alloy steels.
The British tree consisted of an oval shell of manganese steel.
Tungsten steel and certain classes of manganese steel are malleable only when red-hot.
The chief ones are nickel steel, manganese steel, chrome steel and chrome-tungsten steel.
As actually made, manganese steel contains about 12% of manganese and 1.50% of carbon.
Like manganese steel, tungsten steel retains its temper even when heated to high temperatures.