Tempering Colors Steel
Tempering process of hardening steel
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Tempering steel is a two-step process where the
1. Tool is forged and hardened
- tool end is heated to bright red color and forged
| Temperature | Color of Heated Carbon Steel | |
| (oF) | (oC) | |
| 2192 | 1200 | |
| 2012 | 1100 | |
| 1922 | 1050 | |
| 1796 | 980 | |
| 1706 | 930 | |
| 1598 | 870 | |
| 1490 | 810 | |
| 1400 | 760 | |
| 1292 | 700 | |
| 1202 | 650 | |
| 1212 | 600 | |
- tool quenched in cold water and cooled until touchable
- tool is sharpened and polished
2. Tool is tempered
- tool heated to tempering temperature as indicated below
| Temperature | Color of Heated Carbon Steel | ||
| (oF) | (oC) | ||
| 600 | 316 | Scrapers, spokeshaves | |
| 560 | 293 | Screwdrivers, springs, gears | |
| 540 | 282 | Cold chisels, center punches | |
| 520 | 271 | Taps <= 1/4 inch | |
| 500 | 260 | Axes, wood chisels, drifts, taps >= 1/ inch, nut taps, thread dies | |
| 480 | 249 | Twist drills, large taps, knurls | |
| 460 | 238 | Dies, punches, bits, reamers | |
| 450 | 232 | Twist drills for hard use | |
| 440 | 227 | Lathe tools, scrapers, milling, cutters, reamers | |
| 430 | 221 | reamers | |
| 420 | 216 | Knives, hammers | |
- tool quenched in cold water
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