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    2. EN 10269 Grade 34CrNiMo6 (1.6582)

    EN 10269 Grade 34CrNiMo6 (1.6582) Fasteners

    Chromium-Nickel-Molybdenum Alloy Steel Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 Grade 34CrNiMo6 (1.6582)

    EN 10269 Grade 34CrNiMo6 (1.6582) Fasteners are chromium-nickel-molybdenum alloy steel fasteners with very high strength, excellent toughness, and good fatigue resistance, widely used in high-load bolting for pressure vessels, compressors, turbines, and offshore structural applications.

    EN 10269 34CrNiMo6 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
    34CrNiMo6 1.6582 0,30 to 0,38 ≤ 0,40 0,50 to 0,80 0.025 0.035 - - 1,30 to 1,70 0,15 to 0,30 1,30 to 1,70 - -
    • 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 34CrNiMo6 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
    34CrNiMo6 1.6582 +A 255 - -
    • 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.
    34CrNiMo6 1.6582 +QT d ≤ 40 940 1 040 to 1 200 14 40 45
    40 < d ≤ 120 640 min. 800 14 52 45
    • 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 34CrNiMo6 Impact Energy

    Minimum impact energy (longitudinal direction) at low temperature of steels in delivery conditions which support the Essential Safety Requirements of Directive 97/23/EC b

    Material designation Heat treatment conditiona Diameter e 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
    34CrNiMo6 1.6582 +QT d ≤ 100 - - - - - - - - - - - - 40 - - 45
    • 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 Average of 3 test results.
    • d Steel grade 1.4980 may be ordered for cryogenic purposes with impact values of 50 J at -270 °C, 60 J at -196 °C and 70 J at 20 °C.
    • e For rectangular cross sections "d" will be replaced by "b"
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