Shandong JinNai International Trade Co., Ltd.
Shandong JinNai International Trade Co., Ltd.
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4.5MM Stainless Steel 440C Bearing Balls For Nail Polished G10 7/64" 2.778 MM
440 Stainless Steel balls are a martenistic-type stainless steel which is used
extensively in steel ball bearing applications that require hardness, dimensional stability,
corrosion resistance and toughness. 440 Stainless Steel is also used for corrosion-resistant ball
and check valves. 440 ball are resistant to corrosion from fresh water, steam, crude oil, gasoline,
perspiration, alcohol, blood and food stuffs. Maximum resistance to corrosion and
tarnishing is only achieved when 440 is fully hardened and surfaces are polished to a high luster.
440 is also magnetic.
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. |
| Diameters (min/max) | U.o.M. | Diameters (min/max) | U.o.M. | Precision grades (ISO 3290-1 / DIN 5401 / AFBMA) |
|---|---|---|---|---|
| 0.300 - 300.000 | [mm] | 1/64 - 12 | ["] | See section International Standards: ISO 3290-1 / DIN 5401 / AFBMA |
