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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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L-6 Tool Steel Data Sheet
AISI L-6 is a tough, high- strength tool steel suitable for general purpose applications.
This grade is easily oil-hardened at low temperature.
Chemical Composition
| Carbon | 0.75% |
| Manganese | 0.70% |
| Chromium | 0.80% |
| Silicon | 0.25% |
| Nickel | 0.150% |
| Molybdenum | 0.30% |
Typical Applications
| Form Rolls | | Brake Dies |
| Machine Tool Parts | | Chucks |
| Pinions | | Shear Blades |
Thermal Treatments
Note: Full hardness will only be attained in sections less than 3" thick
Preheat : 1250/1350F (675/730C), equalize
Austenize : 1500/1550F (815/840C), 15/30 minutes at temperature.
Quench : Oil to 150F (65C). For minimum distortion, parts may be removed from oil at about 400F(205 C), and air-cooled to hand warm.
Temper : 350/600F (175/315C), hold 2 hours minimum (4 hours preferred) 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 1500F(810C)
| Tempering |
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Toughness |
| Temperature | | Hardness | Charpy C-Notch |
| Deg. F | Deg. C | HRC | Ft. Lbs. | Joules |
| As quenched | | 64 | - | – |
| 300 | 150 | 64 | 15 | 20 |
| 400 | 205 | 61 | 43 | 58 |
| 500 | 260 | 59 | 38 | 52 |
| 600 | 315 | 57 | 68 | 92 |
| 700 | 370 | 54 | - | - |
Surface Treatments
L-6 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 1375/1425F(745/775C), hold two hours, cool slowly, 50F(30C) per hour maximum, to below 1100F(600C), then air cool.
OR
B. Heat to 1375/1425F(745/775C), hold 2 hours, cool to 1200/1250F(650/675C) 6 hours, then air cool.
Typical annealed hardness: 187/235 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 (L-6, 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 | 0.284 lb/in3 | (7860 kg/M3) |
| Thermal Conductivity | 20 BTU/hr./ft./F | 34 W/m/ °K) |
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