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    2. EN 10269 Grade 21CrMoV5-7 (1.7709)

    EN 10269 Grade 21CrMoV5-7 (1.7709) Fasteners

    Chromium-Molybdenum-Vanadium Alloy Steel Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 Grade 21CrMoV5-7 (1.7709)

    EN 10269 Grade 21CrMoV5-7 (1.7709) Fasteners are chromium-molybdenum-vanadium alloy steel fasteners with superior creep resistance and high-temperature strength, primarily used in steam turbine bolting, high-pressure valves, and power plant pressure equipment operating at elevated temperatures.

    EN 10269 21CrMoV5-7 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
    21CrMoV5-7 1.7709 0,17 to 0,25 ≤ 0,40 0,40 to 0,80 0.025 0.030 ≤ 0,030 - 1,20 to 1,50 0,55 to 0,80 ≤ 0,60 0,20 to 0,35 -
    • 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 21CrMoV5-7 Mechanical properties

    Mechanical properties at Room Temperature

    Mechanical properties at room temperature for delivery conditions normally applied for further processing

    Material designation Heat treatment condition a,b Hardness HBW max. Tensile strength Rm MPa max. Reduction in area Z % min.
    Name Number
    21CrMoV5-7 1.7709 +S 255 - -
    +AC 229 - -
    • a + AC = annealed to achieve spheroidized carbides; + S = treated for cold shearing; + A = soft annealed.
    • b Products made to these 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.

    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.
    21CrMoV5-7 1.7709 +QT d ≤ 160 550 700 to 850 16 60 63
    • 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 21CrMoV5-7 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
    21CrMoV5-7 1.7709 +QT d ≤ 160 542*) 530 515*) 500 480*) 460 435*) 410 380 350 - - -
    • 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.
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