• View PDF
    Standard
  •   0091-22-66157017
  •   info@torqbolt.com
    • Home
    2. EN 10269 Grade 20CrMoVTiB4-10 (1.7729)

    EN 10269 Grade 20CrMoVTiB4-10 (1.7729) Fasteners

    Complex Chromium-Molybdenum-Vanadium-Titanium-Boron Alloy Steel Bolts, Stud Bolts, Screws, Nuts & Washers in EN 10269 Grade 20CrMoVTiB4-10 (1.7729)

    EN 10269 Grade 20CrMoVTiB4-10 (1.7729) Fasteners are complex chromium-molybdenum-vanadium-titanium-boron alloy steel fasteners with exceptional high-temperature strength and creep resistance, used in advanced steam turbine bolting and critical pressure vessel applications in power generation plants.

    EN 10269 20CrMoVTiB4-10 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
    20CrMoVTiB4-10 1.7729 0,17 to 0,23 ≤ 0,40 0,35 to 0,75 0.020 0,015 b 0,015 to
    0,080    		 0,001 to 0,010 0,90 to 1,20 0,90 to 1,10 ≤ 0,20 0,60 to 0,80 Ti: 0,07 to 0,15
    As: ≤ 0,020
    Sn: ≤ 0,020
    Cu: ≤ 0,20
    • 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 20CrMoVTiB4-10 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.
    20CrMoVTiB4-10 1.7729 +QT d ≤ 100 660 820 to 1 000 15 50 40
    100 < d ≤ 160 660 820 to 1 000 15 50 27
    • 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 20CrMoVTiB4-10 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
    20CrMoVTiB4-10 1.7729 +QT d ≤ 160 642*) 624 603 595 581 573 559 537 508 464 406 334 -
    • 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.
    Specifications
    Surface Treatments
    Certifications
    About Us
    Questions? Contact us.
    Showcase of our Microsites.
    Satisfaction Survey

    survey

    TUVRheinland CRETIFIED

    © TorqBolt P(Ltd) · Built with in INDIA.