Understanding and Specifying Steel Heat Treating
For anyone who is interested. Design, manufacturing, testing and tooling people. A crash course
covering basic metallurgical theory and some practical advice on what you need to do before
specifying heat
Understanding and Specifying Steel Heat Treating
For anyone who is interested. Design, manufacturing, testing and tooling people. A crash course
covering basic metallurgical theory and some practical advice on what you need to do before
specifying heat treating for mechanical components. How to negotiate testing of production lots.
OUTLINE OF STEEL HEAT TREATING SEMINAR-
- WHAT IS STEEL
- CHEMISTRY OF STEEL
- Steel is mainly iron (usually 90-99+%) with small amounts of
- carbon (__)
- manganese (__)
- and sometimes others...
- TYPES OF STEEL (1010, 4340, D2, etc.)
- There are two ways to divide steel
- Carbon content being High, Medium or Low
- Alloyed or not
- 4 Digit codes system adopted by SAE and AISI uses first two digits to
identify family of steel, last two digits tell amount of carbon.
- We'll do amount of carbon first. For example, in 1010 steel, the
second ten means that there is 10/100% carbon or.10%
carbon, (approximately) in that grade. In 4340 steel, there is
40/100% or.40% carbon.
- The first digit tells us whether there are any elements which are
considered "alloys" in it. (Alloys are the elements listed in A.1.
above BELOW the letter "e".)
- If the first digit is a "1", there are NO alloys.
- If the first digit is not a "1", there are some alloys.
- The second digit tells us
- NOTHING if the first digit is not a "1".
- Whether the material is capable of being "good", tough,
crack resistant steel if the first digit is a "1". In 1nxx
series steels, if the "n" is a
- "0", then it is plain, possibly g