Ferrous Metals Flashcards
Define ferrous metals
Iron based alloys such as steel and cast irons
Characteristics of ferrous metals
easily identified as most are magnetic
easy to work with
withstand high temperatures
extremely stable over a large temperature range
Why is grey cast iron brittle?
carbon is formed in large flakes
Uses of spheroidal graphite cast iron
environments with vibrations
Steel production process
Raw materials - iron ore, limestone,coke, e.t.c
Steel making - molten pig iron, steel serap
Casting
Primary forming
Manufacturing, fabrication and finishing
Product
Types of steel
carbon steel mild(low carbon) steel medium carbon steel high carbon steel ultra light carbon steel hardened steel
Ways to resist corrosion
chromium is added to make stainless steel
zinc or zinc-nickel added to make galvanised steel]
paint the surfaces
isolate the material from moist environments
Types of heat treatment
Annealing
Normalising
Hardening
Tempering
Annealing
used to soften steel
Normalising
used to return steel to its normal structure
Hardening
used to harden steel
the material becomes more brittle
Tempering
used to remove brittleness from hardened materials
