L6 Tool Steel Round Bar
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Gnee Steel (Tianjin) Co., Ltd. is one of the most professional l6 tool steel round bar manufacturers and suppliers in China. Welcome to wholesale customized l6 tool steel round bar at competitive price from our factory. Good service and quality products are available.
Products Description
L6 Tool Steel rod is a versatile, oil-hardening tool steel that is characterized by very good toughness. L6 tool steel is suitable for use as tools, dies, and machine parts, which require a good combination of hardness and toughness. The relatively high nickel content results in an alloy with greater impact toughness compared to the other common oil-hardening grades.
AISI L6 tool steel possesses a fine-grained structure and is noted for it's shock resistance. Compared to other oil-hardened steels, L6 is a tough steel that possesses high strength and good non-deforming characteristics. This is due to the high nickel content in this alloy steel.
Chemical Composition
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.65 – 0.75 | 0.60 – 1.20 | 0.25 – 0.80 | 0.50 | 1.25 – 2.00 | 0.03 Max. | 0.03 Max. | 0.50 | 0.20 – 0.30 |
Heat Treating Instructions
Critical Temperature: Ac1: 1325°F (719°C)
Preheating: Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1150-1250°F (621-677°C) and equalize.
Austenitizing (High Heat): Heat slowly from the preheat.
Furnace or Salt: 1450-1500°F (788-816C)
Soak for 30 minutes for the first inch (25.4 mm) of thickness, plus 15 minutes for each additional inch (25.4 mm).
Quenching: Oil to 150-125°F (66-51°C).
Note: Sizes under 3 inches (76.2mm) in cross section will achieve moderate hardness by cooling in a blast of air or pressurized gas.
Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness, 4 hours minimum, then air cool to ambient temperature.
To minimize internal stresses in cross sections greater than 6 inches (152.4 mm) and to improve stability in tools that will be EDM'd after heat treatment, a soaking time of 8 to 10 hours at the tempering temperature is strongly recommended.
Cryogenic Treatment: Some prefer to do cryogenic treatment as an extension of the quench from the austenitizing treatment. Others prefer to cryogenically treat after tempering.
ANNEALING
Annealing must be performed after hot working and before re-hardening.
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