Steel Service, Inc.
1045 Delaum Rd.
Marys, Pa 15857
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.
|Carbon ||0.75% |
|Manganese ||0.70% |
|Chromium ||0.80% |
|Silicon ||0.25% |
|Nickel ||0.150% |
|Molybdenum ||0.30% |
|Form Rolls || ||Brake Dies|
|Machine Tool Parts || ||Chucks|
|Pinions|| ||Shear Blades|
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)
|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|| -|| -|
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.
A. Heat to 1375/1425F(745/775C), hold two hours, cool slowly, 50F(30C) per hour maximum, to below 1100F(600C), then air cool.
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.
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.
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.
Modulus of Elasticity
|Density||0.284 lb/in3||(7860 kg/M3)|
|Thermal Conductivity||20 BTU/hr./ft./F||34 W/m/ °K)|
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