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Eastern
Tool
Steel Service, Inc.
1045 Delaum Rd.
P.O.
Box 857
St.
Marys, Pa 15857
Phone:
(814) 834-7224
Fax:
(814) 834-7225
Or
Contact Us
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O-1 Tool Steel Data Sheet
AISI O-1 is an oil-hardening tool steel which may be hardened from fairly low temperatures with little size change. O-1 combines deep-hardening qualities with a fine-grained structure, affording good initial production runs, and good continued production after grinding.
Chemical Composition
| Carbon | 0.90% |
| Manganese | 1.25% |
| Chromium | 0.50% |
| Silicon | 0.50% |
| Tungsten | 0.50% |
Typical Applications
| Blanking Dies | | | Engraving Tools |
| Forming Dies | | | Gauges |
| Knives | | | Shear Blades |
Thermal Treatments
Note: Full hardness will only be attained in sections less than 3" thick
Preheat : 1250/1350F (675/730C), equalize
Austenize : 1450/1500F (790/815C), 30/45 minutes at temperature.
Quench : Oil to 150F (65C).
Temper : 350/600F (175/315C), hold 2 hours at temperature, air cool. Temper twice.
Cryogenic Treating : Refrigeration treatments may improve long term dimensional stability by transforming retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.
Hardness and Impact Toughness Data
Oil Quenched from 1475F(800C)
| Tempering |
|
|
Toughness |
| Temperature | | Hardness | Charpy C-Notch |
| Deg. F | Deg. C | HRC | Ft. Lbs. | Joules |
| As quenched | | 65 | - | – |
| 300 | 150 | 64 | 14 | 19 |
| 350 | 175 | 63 | 28 | 38 |
| 400 | 205 | 62 | 30 | 41 |
| 450 | 230 | 61 | 30 | 41 |
| 500 | 260 | 59 | 30 | 41 |
| 600 | 315 | 56 | 32 | 43 |
| 700 | 370 | 52 | - | - |
| 800 | 425 | 49 | - | - |
| 900 | 480 | 44 | - | - |
| 1000 | 540 | 40 | - | - |
Surface Treatments
O-1 can be given standard surface treatments such as hard chrome plating if desired. Nitriding is not generally practical due to a substantial loss of core hardness.
Annealing
A. Heat to 1425/1450F(775/790C), hold two hours, cool slowly, 50F(30C) per hour maximum, to below 1000F(540C), then air cool.
OR
B. Heat to 1425/1450F(775/790C), hold 2 hours, cool to 1275F(690C) 6 hours, then air cool.
Typical annealed hardness: 187/221 BHN.
Stress Relieving
Annealed Material: Heat to 1100/1300F(595/705C), hold two hours, cool in still air.
Hardened Material: Heat to 50F(15C) below original tempering temperature, hold two hours, cool in still air.
Welding
Use oil hardening (O-1) tool steel filler material.
Annealed Material:Preheat to 400/600F(205/315C). Maintain above 400F(205C) during welding. Reanneal or temper 1250/1300F(675/700C) 6 hours.
Hardened Material: Preheat to 50F(15C) below original tempering temperature (300F(150C) minimum). Maintain above 300F(150C) during welding. Cool to 150F(65C) after welding. Retemper twice 25F(15C) below original tempering temperature.
Physical Properties
|
Modulus of Elasticity| 30psix10(6) | (207 GPa) |
| Density | 0.283 lb/in3 | (7850 kg/M3) |
| Thermal Conductivity | 20 BTU/hr./ft./F | 34 W/m/ °K) |
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