Newly Arrival L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 in Mumbai
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,
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VOICEOVER (in English):
“‘Oh, the humanity.’”
“These words were used to described the downing of the Hindenburg airship in New Jersey on May 6, 1937.”
“And this event marked the beginning of the end of airship travel.”
“In the early 1900s, rigid airships, also known as dirigibles or zeppelins, were hailed as the transportation method of the future.”
“The skies were dominated by airships, the most famous of which was the Hindenburg LZ 129.”
“The Hindenburg was a 245-meter-long conventional zeppelin that had a maximum speed of 135 km per hour and a cruising speed of 126 km per hour.”
“In 1936, the Hindenburg inaugurated commercial air service across the North Atlantic by carrying over 1,000 passengers on 10 scheduled round trips between Germany and the United States.”
“Though it was designed to be filled with helium gas, the airship was filled with highly flammable hydrogen instead.”
“This was due to the fact that the U.S. held a monopoly on helium reserves, and had restricted export of the element to Nazi Germany.”
“Airships were designed to accommodate hundreds of passengers, who could enjoy on board facilities such as a bar, dining areas, and even a smoking lounge.”
“In order to meet the ship’s weight requirement, all of the furnishings were made as light as possible. Even cabin beds were made of aluminum.”
“A lightweight baby-grand piano had been created for the vessel, although it was not on board the during the Hindenburg’s last voyage.”
“For its 63rd flight, the ship left the Frankfurt airfield at 7:16 p.m. and flew over Cologne before crossing the Netherlands, the English Channel, and out over the Atlantic before reaching the United States.”
“On May 6, 1937, headwinds delayed the airship’s journey, and its scheduled arrival in Lakehurst, New Jersey at 6:00 a.m. was postponed to 6:00 p.m.”
“In the meantime, the captain decided to take the passengers on a scenic tour. By noon, the ship had reached Boston, and by 3:00 p.m. the Hindenburg was sailing past the skyscrapers of Manhattan.”
“Reports said the large vessel flying past the city created such a sight that people ran out into the streets to see it.”
“When the aircraft was finally cleared to land, it returned to Lakehurst, approaching the field shortly after 7:00 p.m. at an altitude of approximately 600 feet.”
“The captain initiated a wide left turn to fly in a descending pattern around the north and west of the field, to line up for a landing into the wind to the east.”
“During the landing, hydrogen was valved and three drops of water ballast were ordered in an attempt to keep the ship in level trim.”
“When these efforts failed to level the vessel, six crewmen were ordered to go forward in the ship to add their weight to the bow.”
“The vessel was set to make a high-altitude landing, which meant dropping an anchor from a greater height than it normally would be.”
“This required fewer ground crew members, but the process would take longer.”
“In an attempt to land quickly, the captain reportedly executed a tight S-turn to change the direction of the ship’s landing.”
“This was when things went wrong.”
“Some experts later theorized that this sharp turn overstressed the ship, causing a bracing wire to snap and slash a gas cell. This allowed hydrogen to mix with air to form a highly explosive combination.”
“Witnesses claimed they saw a flutter on top of the airship, which indicated gas leaking from the vessel.”
“A fire soon broke out, although accounts of where it started varied.”
“The flames reportedly quickly burned through the logo on the side of the ship before consuming the rest of the vessel.”
“Journalist Herbert Morrison was at the scene doing a recorded radio segment, and his horrified account of the event became one of the most famous pieces of broadcast in American history.”
“In the end, 36 people died, but a remarkable number of people survived.”
“The owner of the Hindenburg initi
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