100CrMnSi6-4 Ball Bearing Steel Bar

 

100CrMnSi6-4 bearing steel is based on the GCr15  steel, the appropriate increase in Si, Mn content to improve its hardenability and flexibility limit, wear resistance is better than GCr15. The manufacture of rolling body is larger than GCr15, mainly for the manufacture of wall thickness> 12mm, diameter> 280mm bearing ring ball diameter> 50mm; conical, cylindrical and spherical roller diameter> 22mm and all sizes of needle.

 

Chemical Composition:

 

C:

Mn:

Si:

P:

S:

Cr:

Al:

Mo:

Ni:

Ti:

Cu:

O:

0.93 - 1.05

1.0 - 1.2

0.45 - 0.75

<0.025

<0.03

1.40 - 1.65

<0.05

<0.1

-

-

<0.3

<0.0015

 

Mechanical Properties:

 

Mechanical properties
Heat treatmentTensile strengthHardness
After annealing with limited hardness-≤ 241 HB
After spheroidizing annealing570 - 720 MPa179 - 217 HB
After heat hardening and spheroidizing annealing590 - 780 MPa179 - 235 HB
After hardening and tempering-≤ 61 HRC
Physical properties
Density, ρ~7,85 kg/dm³
Linear expansion coefficient - α~11,9 ⋅ 10⁻⁶ K⁻¹
Process of heat treatment
Softening annealing750 - 800℃
Hardening830 - 870℃in oil or water
Tempering at150 - 170℃

 

 

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