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    2. EN 10269 NiCr20TiAl (2.4952)

    EN 10269 NiCr20TiAl (2.4952) Fasteners

    Age-Hardened Nickel-Chromium Superalloy Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 NiCr20TiAl (2.4952)

    EN 10269 NiCr20TiAl (2.4952) Fasteners are age-hardened nickel-chromium superalloy fasteners equivalent to Nimonic 80A, offering exceptional high-temperature strength, excellent oxidation resistance, and outstanding creep resistance at temperatures up to 815°C, used in gas turbine bolting, jet engine fastening, and the most demanding high-temperature pressure applications.

    EN 10269 NiCr20TiAl Chemical composition

    Material designation Chemical composition, % by mass
    Name Number C Si Mn P max. S max. Al tot B Cr Mo Ni V Others
    Steels for quenching and tempering
    NiCr20TiAl 2.4952 0,04 to 0,10 ≤ 1,00 ≤ 1,00 0.020 0.015 1,00 to 1,80 ≤ 0,008 18,0 to 21,0 - ≥ 65 - Co ≤ 1,00, Cu ≤ 0,20
    Ti: 1,80 to 2,70
    Fe ≤ 1,50
    • a Elements not listed in this table may not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the usefulness of the steel.
    • b A controlled sulphur content of 0,015 % to 0,030 % improves the machinability and is therefore recommended and may be agreed at time of enquiry and order. For weldability, a controlled sulphur content of 0,008 % to 0,030 % is recommended and may be agreed at time of enquiry and order.
    • c For requirements regarding magnetic properties up to a maximum of 0,28 % C.

    EN 10269 NiCr20TiAl Mechanical properties

    Mechanical properties at Room Temperature

    Mechanical properties at room temperature and at 20°C of steels and nickel alloys in delivery conditions which do not support the Essential Safety Requirements of Directive 97/23/ECb

    Material designation Heat treatment conditiona Diameter c Proof strength Tensile strength Elongation after fracture Reduction in area Impact energy (ISO-V) at 20°C
    Name Number
    d mm Rp0,2 MPa min. Rm MPa A % min. Z % min. KV2 J min.
    NiCr20TiAl 2.4952 +AT+P d ≤ 160 600 1 000 to 1 300 12 12 20
    • a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened;
    • +QT = quenched and tempered; +WW = warm worked (see Annex B).
    • b Products made to these steel grades and these final heat treatment conditions do not support the Essential Safety Requirements of Directive 97/23/EC, unless other criteria are taken into account; see Annex 1, 7.5 of this directive.
    • c For rectangular cross-sections "d" will be replaced by "b"

    EN 10269 NiCr20TiAl Proof strength

    Minimum 0,2 %-proof strength values at elevated temperature of steels and nickel alloys in delivery conditions which do not support the Essential Safety Requirements of Directive 97/23/ECb

    Material designation Heat treatment conditiona Diameter c d mm Minimum 0,2 %-proof strength Rp0,
    2 in MPa at a temperature (in °C) of:
    Name Number 50 100 150 200 250 300 350 400 450 500 550 600 650
    NiCr20TiAl 2.4952 +AT+P d ≤ 160 595*) 586*) 577*) 568 564 560 550 540 530 520 510 500 480
    • a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened; +QT = quenched and tempered; +WW = warm worked (see Annex B).
    • b Products made to these steel grades and these final heat treatment conditions do not support the Essential Safety Requirements of Directive 97/23/EC, unless other criteria are taken into account; see Annex 1, 7.5 of this directive.
    • c For rectangular cross sections "d" will be replaced by "b".
    • *) Values calculated by linear interpolation.

    EN 10269 NiCr20TiAl Tensile Strength

    Minimum tensile strength values at elevated temperatures of nickel alloys in delivery conditions which do not support the Essential Safety Requirements of Directive 97/23/ECb

    Material designation Heat treatment conditiona Diameter c d mm Minimum tensile strength Rm
    in MPa at a temperature (in °C) of:
    Name Number 50 100 150 200 250 300 350 400 450 500 550 600 650
    NiCr20TiAl 2.4952 +AT+P d ≤ 160 1000 975 950 900 900 900 900 900 900 890 880 850 -
    • a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened; +QT = quenched and tempered; +WW = warm worked (see Annex B).
    • b Products made to these steel grades and these final heat treatment conditions do not support the Essential Safety Requirements of Directive 97/23/EC, unless other criteria are taken into account; see Annex 1, 7.5 of this directive.
    • c For rectangular cross-sections "d" will be replaced by "b"

    EN 10269 NiCr20TiAl Impact Energy

    Minimum impact energy (longitudinal direction) at low temperature of nickel alloys in delivery conditions which do not support the Essential Safety Requirements of Directive 97/23/ECb

    Material designation Heat treatment conditiona Diameter d d mm Minimum impact energy KV2 in J c
    (ISO-V test piece) at a test temperature in °C of:
    Name Number -270 -196 -160 -140 -120 -110 -100 -90 -80 -70 -60 -50 -40 -20 0 +20
    NiCr20TiAl 2.4952 +AT+P d ≤160 - 20 - - - - - - - - - - - - - 20
    • a +AT = solution annealed; +C = cold work hardened; +N = normalized; +NT = normalized and tempered; +P = precipitation hardened; +QT = quenched and tempered; +WW = warm worked (see Annex B).
    • b Products made to these steel grades and these final heat treatment conditions do not support the Essential Safety Requirements of Directive 97/23/EC; see Annex 1, 7.5 of this directive.
    • c Average of 3 test results.
    • d For rectangular cross sections "d" will be replaced by "b"
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