403Cb, 410Cb, B50A790, XM-30, UNS S41040

403Cb, 410Cb

403Cb, 410Cb is a martensitic stainless steel, this alloy has higher strength and toughness, the addition of columbium can improve grain size control and make it easier to heat treat, mainly used in electrical energy.

Table of contents

Chemical Composition

GradeChemical composition WT %
403Cb, B50A9470.06-

Mechanical Properties

403Cb Mechanical properties acc. to B50A947

  • Tensile strength Rm MPa: Min 760
  • Yield Strength Rp MPa: Min 555
  • Elong In2 inches %: min 15
  • RA %: min 15
  • Brinell Hardness, 3000Kg Load %: 223-269
  • V-Notch Charpy Min. Energy at R.T. ft-lbs(J): min 25(33.9)

Physical Properties

Heat Treatment

Thermal Properties

Welding Properties

Good welding property

Machining Properties

Good machining property

Similar or Equivalents Steel Grade