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Grade Introduction:
SAE 8620 Alloy 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 8620 alloy steel offers high external
strength and good internal strength, making it highly wear-resistant.
SAE 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. Prehardened and tempered
(uncarbonized) 8620 can be further surface hardened by nitriding but
will not respond satisfactorily to flame or induction hardening due to
its low carbon content. SAE 8620 alloy steel is suited for
applications that require a combination of toughness and wear
resistance. This grade is commonly supplied in a round bar.
Grade Application:
The SAE 8620 can be used for a number of medium-strength applications
such as camshafts, fasteners, gears, and chains/chain pins.
Equivalent grades:
USA |
DIN |
BS |
BS |
JAPAN |
ASTM A29 |
DIN 1654 |
EN 10084 |
BS 970 |
JIS G4103 |
8620 |
1.6523/21NiCrMo2 |
1.6523/21NiCrMo2-2 |
805M20 |
SNCM220 |
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B,
EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13,
CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM
SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, 16MNCR5, 20MNCR5,
C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75,
SAE 52100, S40C, S355J2G3.
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Chemical composition:
The following table shows the chemical composition of SAE8620 steel:
Standard |
Grade |
C |
Mn |
P |
S |
Si |
Ni |
Cr |
Mo |
ASTM A29 |
8620 |
0.18-0.23 |
0.7-0.9 |
0.035 |
0.040 |
0.15-0.35 |
0.4-0.7 |
0.4-0.6 |
0.15-0.25 |
DIN 1654 |
1.6523/ 21NiCrMo2 |
0.17-0.23 |
0.65-0.95 |
0.035 |
0.035 |
≦0.40 |
0.4-0.7 |
0.4-0.7 |
0.15-0.25 |
EN 10084 |
1.6523/ 21NiCrMo2-2 |
0.17-0.23 |
0.65-0.95 |
0.025 |
0.035 |
≦0.40 |
0.4-0.7 |
0.35-0.70 |
0.15-0.25 |
JIS G4103 |
SNCM220 |
0.17-0.23 |
0.6-0.9 |
0.030 |
0.030 |
0.15-0.35 |
0.4-0.7 |
0.4-0.65 |
0.15-0.3 |
BS 970 |
805M20 |
0.17-0.23 |
0.6-095 |
0.040 |
0.050 |
0.1-0.4 |
0.35-0.75 |
0.35-0.65 |
0.15-0.25 |
Mechanical Properties:
Properties |
Metric |
Imperial |
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 |
Poisson’s ratio |
0.27-0.30 |
0.27-0.30 |
Izod Impact |
115 J |
84.8 ft.lb |
Hardness, Brinell |
149 |
149 |
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 |
Hardness:
149
Heat Treatment:
This alloy may be hardened by heating to 1500 F followed by a water
quench. Carburize at 1650 to 1700 F in an appropriate carburizing
medium and oil quench to harden. Improved carburized case and core
properties can be obtained by furnace cooling from carburizing at 1650
– 1700 F and then reheating to 1575 F.
Hardening:
The 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.
Tempering:
Tempering of heat-treated and water quenched parts of SAE 8620 steel
(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 grinding cracks.
Physical Properties
The physical properties of SAE 8620 alloy steel are highlighted in the
following table.
Properties |
Metric |
Imperial |
Density |
7.85 g/cm3 |
0.284 lb/in³ |
Thermal Properties
Properties |
Metric |
Imperial |
Thermal conductivity |
46.6 W/mK |
323 BTU in/hr.ft².°F |
Forging Properties:
SAE 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.
Stress Relieving:
Heat to 630°C – 650°C, hold until temperature is uniform throughout
the section, soak for 1 hour per 25mm section, and cool in still air.
Normalizing:
1675ºF (910ºC) and air cool. This is another method of improving
machinability in 8620 material; normalizing might also be used prior
to case hardening.
Annealing:
AISI 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
the furnace or air-cooled.
Density:
Density (lb / cu. in.) 0.283
Machinability:
The SAE 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 grinding.
Welding:
The alloy SAE 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.
Supply Cities:
Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai,
Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi,
Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka,
Puducherry, Kerala, Tamil Nadu, Telangana, Salem, Thanjavur, Trichy,
Erode, Vellore, Ranipet, Sivakasi, Karur, Hosur, Nagercoil,
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Thiruvannamalai, Pollachi, Rajapalayam, Gudiyatham, Pudukottai,
Vaniyambadi, Ambur, Nagapattinam, Trivandrum, Vijayawada, Guntur,
Thirupathi, Nazarathpet, Kakinada, Kurnool, Kadapa, Nizamabad,
Mahabubnagar, Karimnagar.