Shandong JinNai International Trade Co., Ltd.
Shandong JinNai International Trade Co., Ltd.
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440 C 95X18 Stainless Steel Bearing Balls G 25 Diameter 20.638 MM or 13/16 Inch
Martensitic hardened stainless steel balls, they feature remarkable hardness, wear resistance,
surface finishing, narrow dimensional tolerances. For that reason this type of steel is frequently
used in precision devices. Balls are provided in the passivated condition.
Chemical Composition
|
%C
|
%Si
|
%Mn
|
%P
|
%S
|
%Cr
|
%Mo
|
|---|---|---|---|---|---|---|
|
0.95-1.20
|
1.00 max
|
1.00 max
|
0.040 max
|
0.030 max
|
16.00-18.00
|
0.75 max
|
|
Applications
|
|---|
|
Precision bearings, anti-friction bearings, special valves, conveyor belts and rollers, ballpoint pens. They are used in foodstuff, medical instruments, quick couplings, recirculating ball bearings, knotting devices, oil refinery devices.
|
|
ITA
|
USA
|
GER
|
FRA
|
UK
|
RUS
|
CHN
|
JAP
|
|---|---|---|---|---|---|---|---|
|
X 105CrMo17
|
440C
|
1.4125
|
Z100CD17
|
-
|
95X18
|
9Cr18Mo
|
SUS440C
|
|
Property
|
Symbol
|
U.o.M.
|
Type
|
Notes
|
Values
|
|---|---|---|---|---|---|
|
Density
|
δ
|
[g/cm3]
|
Physical
|
Room temp.
|
7.70
|
|
Young's modulus
|
E
|
[GPa]
|
Mechanical
|
-
|
210
|
|
Specific heat
|
c
|
[J/kg-K]
|
Thermal
|
Room temp.
|
450
|
|
Coefficient of linear thermal expansion
|
α
|
[10^-6/ºC]
|
Thermal
|
(ΔT=0-100°C)
|
10.2
|
|
Thermal conductivity
|
λ
|
[W/(m·K)]
|
Thermal
|
Room temp.
|
19.6
|
|
Electric resistivity
|
ρ
|
[Ω*m*10^-9]
|
Electric
|
-
|
680
|
|
Relative magnetic permeability
|
µ
|
-
|
Magnetic
|
Not hardened
|
> 700
|
|
Property
|
Type
|
U.o.M.
|
Values
|
U.o.M.
|
Values
|
|---|---|---|---|---|---|
|
Hardness
|
Mechanical
|
[HRC]
|
57 - 65
|
-
|
-
|
|
Ultimate tensile strength
|
Mechanical
|
[MPa]
|
1900 - 2000
|
[psix10^3]
|
275 - 290
|
|
Service temperature
|
Thermal
|
[ºC]
|
0 / 400
|
[ºF]
|
32 - 752
|
|
Corrosion Resistance
|
|---|
|
The material resists to corrosion in contact with freshwater, steam, oil, petrol, alcohol. They are subjected to pitting corrosion in sea water environments. Poor corrosion resistance in acid environments.
|
Feature
440C: Martensitic hardened stainless steel balls, they feature remarkable hardness, wear resistance, surface finishing,
narrow dimensional tolerances. For that reason this type of steel is frequently used in precision devices.
Balls are provided in the passivated condition.