Carburized bearing steel grade, chemical composition and mechanical properties, main purpose carburized bearing steel grades and chemical composition
l Special design for fiex point of thickness 0.30~0.33mm or 0.35~0.38mm.
l Special designed trigger for comfortable use in picture framing.
l lntegrity design with main body and magzine,anti-distion after falling.
l Economical air consumption,low noise
l Small dimension,freely in use.
l Light weight, reduces working fatigue.
Brand
Chemical composition (mass fraction) (%)
C
Si
Mn
Cr
Ni
M0
Cu
P
S
≤
G20CrMo
O. 17
~O. twenty three
0.20~
0.35
O. 65~
0.95
O. 35
~O. 65
O. 08～
0.15
O. 25
0.030
O. 030
C20CrNiM0
0.15
~O. 40
0.60~
O. 90
0.40~0.70
O. 15~
O. 30
G20CrNi2M0
O. 40~
O. 70
1.60~2.00
O. 20~
0.30
G20Cr2Ni4
0.30~
0.60
1.25~
1.75
3.25~3.75
G10CrNi3Mo
0.08~
O. 13
O. 40~
O. 70
1.00~
1.40
3.00~3.50
0.08~
0.15
G20Cr2Mn2Mo
0.17~
0.23
1.30~
1.60
1.70~
2.00
≤O. 30
O. 20~
0.30
Longitudinal mechanical properties of carburized bearing steel
Brand
Sample
blank
diameter
/mm
Quenching
Tempering
Mechanical properties
Temperature / °C
cold
but
Agent
Degree / °C
cold
buckle
Agent
Tensile strength
Degree
/MPa
Elongation
Δ5(
%)
Section
ShrinkageΨ
¢ (%)
Impact toughness ak/(KJ/m2)
the first time
Quenching
the second time
Quenching
≥
G20CrNiMo
15
880±20
790±20
oil
150~
200
air
1175
9
45
800
G20CrNi2Mo
25
800±20
980
13
G20Cr2Ni4
870±20
790±20
1175
10
GlOCrNi3M0
15
880±20
180~
200
1080
9
G20Cr2Mn2M0
810±20
127S
40
700
Note: 1. The mechanical properties of G20CrMo are accumulated for reference.
2. The mechanical properties listed in this table are suitable for steels with a cross-sectional dimension of not more than 80 mm. Steels with a size of 8l ~ 100mm allow the elongation, shrinkage and impact toughness to be reduced by 1 unit, 5 units and 5% respectively according to the requirements of this table; steels with a size of 101-150 m are allowed. Elongation, shrinkage and impact toughness are reduced by 2 units, 10 units and 10% respectively according to the provisions of this table; potassium materials with a size of 151-250mm allow elongation, shrinkage and impact toughness. The provisions of this table are reduced by 3 units, 15 units and 15% respectively.
3. When the steel with a height of more than 80 mm is changed or forged into a sample of 70 to 80 mm, the results shall comply with the requirements of this table.
4. Delivery status: Hot rolled or forged steel is delivered in hot rolled (wrought) condition or delivered in an annealed condition. Cold drawn steel shall be delivered in an annealed (or tempered) condition. For steels delivered in an annealed condition, the hardness, G20Cr2Ni4(A) is not more than 241, and the remaining steel numbers are not more than 29.
Application of carburized bearing steel
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Brand
Application examples
G20CrMo
For bearing rings and rolling elements for impact loads such as automobiles and tractors
G20CrNiMo
For bearing rings and rolling elements for impact loads such as automobiles and tractors
G20CrNi2Mo
Used to withstand bearings with high impact loads, such as engine main bearings
G20Cr2Ni4
Large-scale bearings that produce high impact loads, such as rolling mills, bearings for mining machinery, are also used to manufacture small and medium-sized bearings that are subjected to shock loads and have high safety requirements.
G10CrNi3Mo
For large and medium-sized bearings with large impact loads
G20Cr2Mn2Mo
Large-scale bearings that produce high impact loads, such as rolling mills, bearings for mining machinery, are also used to manufacture small and medium-sized bearings that are subjected to large impact loads and high safety requirements. They are new steel grades that are adapted to the characteristics of China's resources.
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