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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
This is Part 4 in my Myths About Guitars series.
The Copper Development Association is pleased to present a series of video presentations covering the welding of the copper-nickel alloy. This video is the second in a series designed to provide welders with the principles of joining 90-10 and 70-30 engineering grades of copper-nickel. Here we consider TIG welding.
To recap, in our first video, we covered preparation for welding.
- Maintain a high level of cleanliness and avoid contamination which can cause weld cracking
- Preheat and post weld heat treatments are unnecessary
We are assuming that all viewing this video are familiar with the basics of welding and our message is to point out where the copper-nickel alloys are different and exceptions are needed.
Direct current electrode negative is the welding current used for TIG welding of copper nickel alloys. The welding power source should have a down-slope or current decay as well as a lift or high frequency start to minimize defects at the start and end of each pass.
The tungsten electrode used for TIG welding copper-nickel can be the same as the one used for welding other alloys such as stainless steel or nickel alloys.
The end of the electrode is beveled by always grinding it in the longitudinal direction. The grinding should be done on a grinding wheel dedicated to tungsten electrodes to prevent contamination.
The filler metal used for welding both the 90-10 and 70-30 alloys is the 70-30 alloy. In making any copper-nickel weld it is good practice to always add filler metal when possible to provide an optimum weld composition.
The shielding gas for gas tungsten arc welding of copper-nickel is 100% argon. The cup size should be as large as practical provided it does not interfere with welder visibility. A gas lens often improves the gas protection and can allow extending the electrode for welding in areas of tight access.
The torch should be held to about a 15º angle back from the direction of travel and filler metal about 90º from the torch or 15º off the work piece. Tilting the torch to a much greater angle tends to reduce the shielding gas protection and the filler metal should always be held within the inert gas shield area. If the filler metal end becomes oxidized, the end should be cut off.
Visually inspect the weld contour and look for defects such as cracks, undercut, or lack of fusion.
In addition to this video presentation there is also free printed literature covering all aspects of fabrication, welding, corrosion resistance and other subjects of help to all involved with the alloys. We invite you to visit www.coppernickel.org or contact email@example.com to access this literature.