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O1 tool steel is the original oil-hardening, “non-shrinking” tool steel that can be hardened to the Rockwell C 65 range from a low austenitizing temperature. O1 is a general-purpose tool steel that is typically used in applications where alloy steels cannot provide sufficient hardness, strength, and wear resistance.
Where greater dimensional stability in heat treatment or improved wear resistance is required, tool steels with higher alloy contents, such as A2 or D2, should be considered.
| Weight % | C | Mn | Si | Cr | Ni | W | V | Cu | S | P | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| minimum | 0.85 | 1.00 | — | 0.40 | — | 0.40 | — | — | — | — | reminder |
| maximum | 1.00 | 1.40 | 0.50 | 0.60 | 0.30 | 0.60 | 0.030 | 0.25 | 0.030 | 0.030 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.283 lbs/in3 | 7.833 g/cm3 | |
| Coefficient of thermal expansion | 100°F – 500°F
38°C – 260°C |
5.961 micro in/in- °F | 10.73 micro m/m- °K |
| 100°F – 1000°F
38°C – 538°C |
7.839 micro in/in- °F | 14.11 micro m/m- °K |
| Hardness – Rockwell C | Modulus | Izod Impact (Unnotched) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Air cooled
from 871°C 30 minutes |
Air cooled
from 802°C 30 minutes |
Air cooled
from 774°C 30 minutes |
Of elasticity
|
Oil quenced
from 816°C 150°C Temper Temperature |
Oil quenced
from 816°C 430°C Temper Temperature |
||||
| GPa | Ksi ∙ 103 | J | ft-lb | J | Ft-lb | ||||
| All | 64 | 65 | 62 | 214 | 31 | 27.1 | 20.00 | 190 | 140 |
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