When choosing a die material such as steel you should always weigh up the positives and negatives to ensure you are selecting the most effective die material.
Steel is a very hard wearing die material that also has good heat transfer characteristics. Steel can also be polished/restored without losing the sharpness of the image.
Steel is commonly used on plastic for sharper details on longer running jobs.
Production run length: Medium to long
However, a few negative points you should consider about steel are; steel is another die material that is very expensive and steel is also not widely available.