SUJ2 Steel Equivalent, Composition, Properties, Hardness

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JIS G4805 SUJ2 bearing steel
SUJ2 bearing steel

SUJ2 steel is a Japanese JIS standard high carbon chromium bearing steel grade. After heat treatment, it has high and uniform hardness, good dimensional stability and corrosion resistance, but the weldability is poor.

SUJ2 material is used to make various bearing rings and rolling elements, such as steel balls, tapered rollers, cylindrical rollers, spherical rollers, needle rollers, etc. It can also be used to manufacture molds, precision measuring tools, etc.

SUJ2 Steel Steel Chemical Composition

The chemical composition of SUJ2 bearing steel are displayed in the following table.

SUJ2 Steel Chemical Composition %
StandardSteel GradeCSiMnP ≤S ≤CrNi ≤Mo ≤Cu ≤
JIS G4805SUJ20.95-1.100.15 – 0.35≤ 0.500.0250.0251.30-1.600.250.080.25

Note: The Cu content of the wire rod shall be 0.20% or less.

SUJ2 Steel Mechanical Properties

Spheroidizing annealed hardness

  • SUJ2 Material Brinell hardness: ≤201 HBW
  • Material Rockwell hardness: ≤94 HRB

SUJ2 Equivalent Grades

SUJ2 steel equivalent to ISO, US ASTM, European EN, Germany DIN, British BS, France NF, and Chinese GB standard. (For reference)

SUJ2 equivalent grades
JapaneseISOUSAEuropeanGermanyFranceChina
StandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGrade
JIS G4805SUJ2ISO 683-17100Gr6;
1.3505
ASTM A295/A295M52100EN ISO 683-17100Gr6;
1.3505
DIN EN ISO 683-17100Gr6;
1.3505
NF EN ISO 683-17100Gr6;
1.3505
GB/T 18254GCr15 Steel

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