Hardening and Tempering Colors: Difference between revisions
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[[Category: | [[Category:Construction]] | ||
by [[Jan-Eric Nyström]] | by [[Jan-Eric Nyström]] | ||
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[[File:Hardening and Tempering Colors.jpg|thumb|center|500px|Hardening and Tempering Color Chart, by Jan-Eric Nyström. Used with permission.]] | [[File:Hardening and Tempering Colors.jpg|thumb|center|500px|Hardening and Tempering Color Chart, by Jan-Eric Nyström. Used with permission.]] | ||
Temperature conversion for the colors listed above: | |||
* 600°C = 1112°F | |||
* 700°C = 1292°F | |||
* 800°C = 1472°F | |||
* 900°C = 1652°F | |||
* 1000°C = 1832°F | |||
* 1100°C = 2012°F | |||
I shot a piece of bright iron heated from one end to show the tempering colors. My source (a book from 1943) gives these temperatures for certain purposes: | I shot a piece of bright iron heated from one end to show the tempering colors. My source (a book from 1943) gives these temperatures for certain purposes: | ||
Latest revision as of 00:05, 15 January 2015
Just for those who have asked for it, here's a quick picture of the colors to look for when heating iron to harden & temper it:
Temperature conversion for the colors listed above:
- 600°C = 1112°F
- 700°C = 1292°F
- 800°C = 1472°F
- 900°C = 1652°F
- 1000°C = 1832°F
- 1100°C = 2012°F
I shot a piece of bright iron heated from one end to show the tempering colors. My source (a book from 1943) gives these temperatures for certain purposes:
- 230°C (446°F), light straw/yellow: Very hard cutting tools, engraving tools. Brittle.
- 260°C (500°F), dark yellow to brownish red: Lathe tools
- 270°C (518°F), reddish brown: drills, screwcutting taps
- 290°C (554°F), blue: springs, tools for stone and wood