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    2. EN 10269 Grade X7CrNiMoBNb16-16 (1.4986)

    EN 10269 Grade X7CrNiMoBNb16-16 (1.4986) Fasteners

    Boron And Niobium-Strengthened Austenitic Stainless Steel Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 Grade X7CrNiMoBNb16-16 (1.4986)

    EN 10269 Grade X7CrNiMoBNb16-16 (1.4986) Fasteners are boron and niobium-strengthened austenitic stainless steel fasteners with outstanding high-temperature creep strength and microstructural stability, used in advanced steam turbine bolting, nuclear reactor internals, and ultra-supercritical power generation plant pressure components.

    EN 10269 X7CrNiMoBNb16-16 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
    X7CrNiMoBNb16-16 1.4986 0,04 to 0,10 0,30 to 0,60 ≤ 1,50 0.045 0,015 b - 0,05 to 0,10 15,5 to 17,5 1,60 to 2,00 15,5 to 17,5 - Nb+Ta: 10 x C to 1,20
    • 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 X7CrNiMoBNb16-16 Mechanical properties

    Mechanical properties at Room Temperature

    Mechanical properties at room temperature and at 20 °C of steels in delivery conditions which 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.
    X7CrNiMoBNb16-16 1.4986 +WW+P d ≤ 100 500 650 to 850 16 - 50
    • 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 of steel grades and these final heat treatment conditions support the Essential Safety Requirements of Directive 97/23/EC, see Annex 1, 7.5 of this directive.
    • c For rectangular cross-sections "d" will be replaced by "b" (see Figure 1).

    EN 10269 X7CrNiMoBNb16-16 Proof strength

    Minimum 0,2 %-proof strength values at elevated temperature of steels in delivery conditions which support the Essential Safety Requirements of Directive 97/23/EC d

    Material designation Heat treatment conditiona Diameter e 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
    X7CrNiMoBNb16-16 1.4986 +WW+P d ≤ 100 489*) 470*) 451*) 432 412 393 372 353 334 314 284 255 206
    • 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 This steel grade is generally not applied in the creep range.
    • c Values in brackets signify that the steel is not intended for use (and testing) at those temperatures.
    • d Products made to these steel grades and these final heat treatment conditions support the Essential Safety Requirements of Directive 97/23/EC; see Annex 1, 7.5 of this directive.
    • e For rectangular cross sections "d" will be replaced by "b" (see Figure 1).
    • *) Values calculated by linear interpolation.

    EN 10269 X7CrNiMoBNb16-16 Tensile Strength

    Minimum tensile strength values at elevated temperatures of steels in delivery conditions which support the Essential Safety Requirements of Directive 97/23/EC b

    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
    X7CrNiMoBNb16-16 1.4986 +WW+P d ≤ 100 635 615 590 570 550 530 505 485 460 440 420 395 375
    • 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 support the Essential Safety Requirements of Directive 97/23/EC; see Annex 1, 7.5 of this directive.
    • c For rectangular cross-sections "d" will be replaced by "b"
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