Japan · JIS

SUH 4

JIS G4311:2011 — Heat-resisting steel bars and wire rods

Chemical composition

wt% · log scale
0.010.1110100C0.75 – 0.85Cr19 – 20.5Cu0.3Mn0.2 – 0.6Ni1.15 – 1.65P0.03S0.03Si1.75 – 2.25
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2≥685 MPaTensile strength Rm≥880 MPaImpact energy Kv/Ku≥10 JElongation A≥10 %Reduction of area Z≥15 %HardnessHBbars +Q, <= 75 mm, , orHardnessHBbars +A

Chemical composition

ElementminmaxSimilarRemarks
C0.750.85
Cr1920.5
Cu0.3may be contained
Mn0.20.6
Ni1.151.65
P0.03
S0.03
Si1.752.25

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
bars +Q, <= 75 mm, , or≥685≥880≥10≥15≥10 J/cm^2; For 2 mm U Notch test pieces.HB ≥262 HBW
bars +AHB ≤321 HBW