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52100

MATERIAL SPECIFICATIONS: DIN 17230 (1980)
CHEMICAL COMPOSITION (WEIGHT %)
C (ï¼…):     0.93~1.05
Si (ï¼…):    0.15~0.35
Mn (ï¼…):  0.25~0.45
P (ï¼…)≤:  0.025
S (ï¼…)≤:  0.015
Cr (ï¼…):   1.35~1.60

Mo (ï¼…):   â€”

Other(ï¼…):  Al ≤0.050, Cu ≤0.30
DIFFERENT HARDNESS OF BEARING STEEL
Annealed condition ≤HBS:  207
Quenched condition HRC| water quenched:  66
Quenched condition HRC| oil quenched:       65
HRC|100℃:    64
HRC|150℃:    63
HRC|200℃:    62
HRC|250℃:    59
HOT WORKING AND HEAT TREATMENT
Hot working temperature /℃: 1100~850
Heat treatment temperature /℃|annealed:     780~800
Heat treatment temperature /℃|normalized:  870~900
Heat treatment temperature /℃|quenched:    800~830water,830~870oil
Heat treatment temperature /℃|tempered:    150~170











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