Factory Outlets AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220 Factory for Lithuania
AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel,generally supplied in the as rolled condition with a maximum hardness HB 255max. SAE steel 8620 offers high external strength and good internalstrength, making it highly wear resistant. AISI 8620 steel has a highercore strength than grades 8615 and 8617. SAE 8620 alloy steel isflexible during hardening treatments, thus enabling improvement ofcase/core properties. Pre hardened and tempered (uncarburized) 8620 ca...
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is a low alloy nickel, chromium, molybdenum case hardening steel,
generally supplied in the as rolled condition with a maximum hardness HB
255max. SAE steel 8620 offers high external strength and good internal
strength, making it highly wear resistant. AISI 8620 steel has a higher
core strength than grades 8615 and 8617.
SAE 8620 alloy steel is
flexible during hardening treatments, thus enabling improvement of
case/core properties. Pre hardened and tempered (uncarburized) 8620 can
be further surface hardened by nitriding but will not respond
satisfactorily to flame or induction hardening due to its low carbon
Steel 8620 is suited for applications which require a
combination of toughness and wear resistance. This grade is commonly
supplied in round bar.
1. AISI 8620 Steel Supply Range
8620 Round Bar: diameter 80mm – 1200mm
8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
8620 Square Bar: 140mm – 460mm
8620 tubes are also available against your detailed request.
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
2. SAE 8620 Steel Specification and Relevant Standards
3. ASTM 8620 Steels & Equilvalents Chemical Composition
4. AISI 8620 Steel Mechanical Properties
8620 Physical Properties:
Density (lb / cu. in.) 0.283
Specific Gravity 7.8
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.1
Melting Point (Deg F) 2600
Thermal Conductivity 26
Mean Coeff Thermal Expansion 6.6
Modulus of Elasticity Tension 31
8620 Steel Mechanical Properties
|Tensile strength||530 MPa||76900 psi|
|Yield strength||385 MPa||55800 psi|
|Elastic modulus||190-210 GPa||27557-30458 ksi|
|Bulk modulus (typical for steel)||140 GPa||20300 ksi|
|Shear modulus (typical for steel)||80 GPa||11600 ksi|
|Izod Impact||115 J||84.8 ft.lb|
|Hardness, Knoop (converted from Brinell hardness)||169||169|
|Hardness, Rockwell B (converted from Brinell hardness)||80||80|
|Hardness, Vickers (converted from Brinell hardness)||155||155|
|Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)||65||65|
5. Forging of Material 8620 Steel
8620 alloy steel is forged at a start temperature of around 2250ºF
(1230ºC) down to approximately 1700ºF(925ºC.) prior to the hardening
heat treatment or carburizing. The alloy is air cooled after forging.
6. ASTM 8620 Steel Heat Treatment
8620 steel may be given a full anneal by heat to 820℃ – 850℃, and hold
until temperature is uniform throughout the section and cool in furnace
or air cooled.
of heat treated and water quenched parts of 8620 steels (not
carburized) is done at 400 F to 1300 F to improve case toughness with
minimal effect on its hardness. This will also reduce the possibility of
AISI steel 8620 will be austenitized at around 840°C – 870°C, and oil
or water quenched depending upon section size and intricacy. Cool in Air
or Oil required.
(910ºC) and air cool. This is another method of improving machinability
in 8620 material; normalizing might also be used prior to case
7. Machinability of SAE 8620 Steel
8620 alloy steel is readily machined after heat treatment and/or
carburizing, should be at a minimum so as not to impair the hardened
case of the part. Machining may be done by conventional means prior to
heat treatment – after carburizing machining is usually limited to
8. Welding of 8620 Materials
alloy 8620 may be welded as rolled condition by conventional methods,
usually gas or arc welding. Preheating at 400 F is beneficial and
subsequent heating after welding is recommended – consult the approved
weld procedure for the method used. However, welding in the case
hardened or through hardened condition is not recommended
9. Application of ASTM 8620 Steel
8620 steel material is used extensively by all industry sectors for
light to medium stressed components and shafts requiring high surface
wear resistance with reasonable core strength and impact properties.
applications are: Arbors, Bearings, Bushings, Cam Shafts, Differential
Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts,
Ratchets, Sleeves and other applications where it is helpful to have a
steel that can be readily machined and carburized to controlled case
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Published on Jan 12, 2015
The helicopter can be outside the zone of influence of the earth (ground effect is) or in it. Screen effect is observed when the helicopter hovers close to the ground, where the air flow produced by the propeller, is reflected from the surface. Thus, aircraft thrust is increased at the same angle of inclination of the blades. The effect is most pronounced in calm weather on a flat, hard surface.
The on-screen effect is observed at a minimum under the condition that the distance between the housing and the substrate equals the length of the blade. In this case, the pilot must increase the overall move to stabilize the freeze. Thus the real power is reduced, which may engage the pilot, that is, the potential height when hanging reduced accordingly.
Good evening everyone. Here we have tried to show that now are possible aircraft, made of modern materials and the effective weight of 50-70 kilograms per conditioned passenger trains, is about one ton per passenger, as they say, feel the difference. A fly is not high, also has some very serious advantages. First – we can feed an electric current from a steel trestle over which we fly, and it allows us to not have to aircraft such mandatory for autonomous aircrafts things as fuel, cooling, batteries, gearboxes, transmission shafts, boxes drives, clutches , brake rotor, main gearbox, and you ponimaete- is the hardest thing in the helicopter and not reliable in operation. Freed from all this, the aircraft becomes much easier and more reliable at times. The phone is nothing but electrical drives and drive control system is a very reliable thing, even just because it is extremely simple. Second – modern electric motors allow to achieve a unique index to the ratio of the weight of the power of 5 kW per 1 kg of body weight, in most modern helicopters hardly typed 1 kW per 1 kg of weight of the motor. In short, eat through the current collector, and have in the cabinet only drive end of a completely new and very advantageous state drives at such a high acceleration in the speed of rotation, in the direction of increasing that to decrease the number of revolutions that it can is in the sky, rooted to the spot as tied, maneuverability is fantastic.
Science & Technology
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Source: Dahir Insaat