Bearing steel: 51200
Standard: ASTM A295-98
● Features and Scope:
Good overall performance, after quenching and tempering, high hardness and uniform, wear resistance, contact fatigue strength. Steel thermal processing, annealing after the ball has good machinability. Should make wall thickness ≤12mm, various bearing rings ≤250mm outside diameter, and ball diameter ≤50mm, conical, spherical roller diameter ≤22mm and all sizes of needle; also used in the manufacture of measuring tools, molds, woodworking tools
● Chemical Composition:
Carbon C: 0.93 ~ 1.05
Si Si: 0.15 ~ 0.35
Mn Mn: 0.25 ~ 0.45
Sulfur S: ≤0.015
Phosphorus P: ≤0.025
Chromium Cr: 1.35 ~ 1.60
Ni: to allow the residual content ≤0.25
Cu: to allow the residual content ≤0.30
Mo Mo: to allow the residual content ≤0.10
Note: Aluminum AL: allow the residual content ≤0.050
● Mechanical Properties:
Tensile strength σb (MPa): 1617
Impact energy Akv (J): 28
Hardness: 61 ~ 64HRC
Sample size: a sample
● Heat treatment and microstructure specifications:
Heat Treatment Specification: 850 ~ 860 ℃ quenching, oil cooling; 160 ℃ tempering 2h.
Microstructure: tempered martensite.
● Delivery status: hot-rolled (forged) annealing, not annealed, annealed skinned steel, cold drawn (rolled) round, polished round steel, hot-rolled steel, annealed steel skinned, cold drawn (rolled) steel eight kinds state delivery.