X5CrNiCuNb16-4 ESR Wrought billets or round bars, for subsequent cold cutting and hot forging into turbine blades

X5CrNiCuNb16-4 ESR Wrought billets or round bars, for subsequent cold cutting and hot forging into turbine blades

Keywords: X5CrNiCuNb16-4, X5CrNiCuNb17-4, AISI 630, 17-4 PH, S17400, 1.4542

Metallurgy: EAF, followed by AOD or VOD, followed by ESR

Process route and surface finish: Hot forged or rolled, overaged, descaled or rough machined (1E or 1X according to UNI EN 10088-3)

Applicable standards: UNI EN 10088-3, UNI EN ISO 6506, ASTM E112, SAE AMS 2315, ASTM E45, ASTM E381, UNI EN ISO 6892, UNI EN ISO 148, ASTM A 370, SEP 1923.

Material Properties Requirements:

Chemical Composition:

CSiMnPSCrCuNiNbNb+TaN*
≤0.0500.10-0.350.30-0.60≤0.025≤0.00515.00-15.503.00-3.704.20-5.000.20-0.350.20-0.350.02-0.05

    All the values are given in weight percentage [%]. Wherever not specified, no alloying addition should be made. * = Value of N to be reported in a separate sheet.

Microstructure

  • The microstructure shall be uniform and fine grained across the whole product section.
  • Chemical segregations resulting in linear indications, segregated bands, big size carbides (Ø ≥ 10 μm), carbides allignments, carbides precipitations at former austenitic grain boundaries shall not be accepted.
  • Avg. grain size according to ASTM E112: ≥ 5.
  • Fields with avg. grain size according to ASTM E112 < 3 shall not be accepted.
  • Delta ferrite content according to SAE AMS 2315 < 0.9% on the worst field.
  • Inclusions content according to ASTM E45, Method A:
    • ABCD
      ThinHeavyThinHeavyThinHeavyThinHeavy
      10.510.510.510.5

Expected mechanical properties

  • Rp 0.2 %
    [MPa]
    Rm %
    [MPa]
    A5
    [%]
    Z
    [%]
    Impact Energy
    [J]
    Hardness
    [HB]
    FATT50
    [°C] (**)
    930-1000max 1040min 13%min 50%min 100(*)295-335max -25°C

(*) = Avg of 3 specimens

(**) = meaning at least 50% shear below the indicated temperature. Shear percentage to be evaluated according to ASTM A 370. The FATT50 diagram shall be included in the certificate, the choice of points shall allow a consistent fitting, for example temperatures should lay over a span of 60 degrees, centered on the target value.