13 Years manufacturer L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 Manufacturer in Mali
In ASTM A681 standard, L6 steel grade is in L-type for special purpose tool steels. AISI L6 tool steel is in the general class of alloy, oil-hardening tool steel that is characterized by good toughness. ASTM L6 tool steel is suitable for use as tools, dies, and machine parts, which require a good combination of hardness and toughness. Due to its lower carbon content and relatively high nickel content, L6 tool steel has slightly better shock-resistance than more highly alloyed types and shoul...
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is in the general class of alloy, oil-hardening tool steel that is
characterized by good toughness. ASTM L6 tool steel is suitable for use
as tools, dies, and machine parts, which require a good combination of
hardness and toughness.
Due to its lower carbon content and
relatively high nickel content, L6 tool steel has slightly better
shock-resistance than more highly alloyed types and should be used where
some wear-resistance can be sacrificed for increased toughness.
1. Relevant Steel Specification of L6 Tool Steel
2. AISI L6 Steel Chemical Composition and Steel Equivalents
|L6/T61206||0.65||0.75||0.25||0.80||0.03||0.03||0.10||0.50||0.60||1.20||. . .||. . .||. . .||0.50||1.25||2.00|
|DIN ISO 4957||C||Mn||P||S||Si||Cr||V||Mo||Ni|
|BH224/5||0.49||0.57||0.70||1.00||0.03||0.025||. . .||0.35||0.70||1.10||. . .||. . .||0.25||0.40||1.25||1.80|
3. ASTM L6 Tool Steel Mechanical Properties
Steel L6 Physical Properties
Modulus of elasticity [103 x N/mm2]: 215
Density [g/cm3]: 7.84
Thermal conductivity [W/m.K]: 36.0
Electric resistivity [Ohm mm2/m]: 0.30
Specific heat capacity[J/g.K]: 0.46
Mechanical Properties of L6 Steels
|Poisson’s ratio||0.27- 0.30||0.27- 0.30|
|Elastic modulus||190-210 GPa||27557-30457 ksi|
4. Forging of L6 Tool Steel
Forge at 1079°C (1975 F) down to 871°C (1600 F). Do not forge below 843°C (1550 F).
5. AISI L6 Tool Steel Heat Treatment
Heat steel L6 at a rate not exceeding 204°C (400°F) per hour (222°C per
hour) to 621-677°C (1150-1250°F) and equalize. Soak for 30 minutes for
the first inch (25.4 mm) of thickness, plus 15 minutes for each
additional inch (25.4 mm).
Quench L6 tool steel in oil to 66-51°C (150-125°F).
L6 steels immediately after quenching. Hold at temperature for 1 hour
per inch (25.4 mm) of thickness when tempering at 204°C (400°F), 4 hours
minimum, then air cool to ambient temperature.
However, where increased toughness is desired, at a sacrifice of some hardness, higher tempering temperatures are often used.
AISI L6 steel does not become brittle, as many other die steels do, when tempered in the range of 232°C to 426°C (450 to 800°F).
minimize the possibility of cracking, the steel should be tempered
immediately after hardening and should be heated slowly to the desired
Annealing of steel L6 must be performed after hot working and before re-hardening.
to 760°C (1400°F) and hold one hour per inch of maximum thickness. Then
cool slowly with the furnace at a rate not exceeding 28°C per hour(50°F
per hour) to 538°C (1000°F). Continue cooling to ambient temperature in
the furnace or in air.
For improved machinability, hold at 760°C
(1400°F) for 1 hour per inch (25.4mm) of maximum thickness; 2 hours
minimum. Then cool slowly with the furnace cool from 677°C (1250°F) to
760°C (1400°F), hold for 8 hours, then air cool to ambient temperature.
Because of its air-hardening ability, steel L6 should not be normalized.
6. Machinability of Steel L6
of tool steel L6 is very good. It rates 90% of the machinability of the
W-group water hardening low alloy steels rated 100% as a baseline.
7. Applications of ASTM A681 L6 Tool Steel
L6 cold working tool steel is for general purpose tools and dies where
greater toughness is required, but with some sacrifice of
Typically used below applications:
blanking and forming dies,
Ever wondered how ball bearings are made?
Today on How It’s Made, ball bearings, electrical wires, wax casting and automated machines. With the entire high end couplet these days, the lowly ball bearing gets forgotten but many machines needs ball bearings to rotate. Household appliances, industrial machines and car engine parts, alternator and fans. This is what’s called a deep groove radio ball bearing. It has steel balls that move inside tracks called raceways. The raceways are carved into a set of heavy-duty rings. The balls were made from the same type of steel. They first prepare the shape of the rings to the right thickness. They insert the inner ring to the outer ring. The set passes through a grinder that alters width to the correct thickness. A gauge checks the width of each ring as it exit.
Now they separate the inner and the outer rings in order to grind their outer circumference on separate machines. The outer rings enter the grinder which shapes its outer surface to a precise roundness and diameter. A water-based liquid keeps the outer rings from overheating which would cause warping. The ring exits the grinder from a gauge that checks the diameter. Next the outer rings go for grinding. A brace of steel wheels and oil cog shapes the surface to a precisely correct roundness and size. The inner ring and raceways goes through a similar machine. Now the ring goes for polishing and a brace of stone lubricates with oil polishes the steel until you see a reflection. Next stop is washing. They coat the rings with thick oil and a fine stone grid. They clean the raceways with kerosene. Elsewhere in the planet they classify the steel balls according to size.
These balls started out as steel wire. Machine cuts them into pieces and a then punches them into steel balls. Those rough balls go into the grinder which removes the bumps then other machine round them up and give them a mirror finish. This entire process takes a few days. The balls go through a furnace where they are hardened. Then they get a bath and cleaning solvent. After several quality checks, the finished balls goes into hoppers. The hoppers load them into an automatic assembly machine. The ball fitter sends the balls through tubes to a ball pusher that fix the correct quantity of balls into the raceways of the now re-assembled inner and outer rings. Next comes the ball cage, a metal cage that retains the balls in position around the raceways.
The first machine installs half of the cage. The half drives holes. The next machine carefully positions the outer half of the cage. The half with rivets. The machine test spins the bearings then rivets the two halves the ball cage together. The bearing is now fully assembled. Now it goes to a solvent bath then to a series of automated quality control tests. This noise vibration tests makes sure the ball bearing operates quietly. Some types of bearings are lubricated with grease. A machine squirts evenly into the ball bearings then inserts a rubber seal after the grease. A final quality control test, an automated scale tosses out bumped bearings that aren’t the required weight. The good ones move to the laser which marks them with information such as the part number and the trademark.
For more details and questions about ball bearings, you may contact Bearing Shop UK at +44 843 289 4606 or e-mail us at firstname.lastname@example.org. We are located at Unit 13 Neptune Close, Medway City Ind. Est, Rochester, ME2 4LT. BearingShop is part of a large bearing distribution company that has been trading for the past 20 years. We strive to provide an excellent service to all our customers no matter how big or small.
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