Carbon is the primary alloying element present in the carbon steels. They contain 0.4% silicon and 1.2% manganese. Small quantities of molybdenum, chromium, nickel, aluminium, and copper are also ...

This article was updated May 25, 2023. It was originally published Nov. 17, 2009. To put hard, durable threaded holes in plastics, engineers often specify threaded metal inserts that will securely ...