1.7729 / 20CrMoVTiB4-10+QT / Durehete™ 1055 / Alloy T41

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1.7729 / 20CrMoVTiB4-10+QT / Durehete™ 1055 / Alloy T41

Round Bars 19–290 mm

Bright or hot rolled EN 10060

EN 10269

EN 10204-3.1 Europe Origin

Conforms with Alstom, CEGB 0259604/82 (T41), CEGB GDCD TD2 ISS2, GE, GEC Turbine Generators Ltd - spec 30/227 ISS 10/83, Siemens, TLV 9105, TLV 9185

Material properties: Tensile Strength 820–970 MPa, Yield Strength 660– MPa, Working temperature –570 °C

Equivalent or similar: ČSN 15320

Alloy T41is designed for use for bolting, fastener and support rods in turbine, boiler and power plant applications. The material is particularly suitable in elevated temperature areas and where good creep, notch and relaxation resistance is required.

Material 1.7729 is a special alloy steel that falls into the category of both low-temperature and high-temperature materials. Here are some key details about this material:

• Chemical Composition:
  • Contains approximately 0.17–0.23% carbon ©.
  • Has a maximum silicon (Si) content of 0.4%.
  • Contains 0.35–0.75% manganese (Mn).
  • Has a maximum nickel (Ni) content of 0.2%.
  • Contains trace amounts of phosphorus (P) and sulfur (S) (both less than 0.02%).
  • Contains 0.9–1.2% chromium (Cr).
  • Has 0.9–1.1% molybdenum (Mo).
  • Contains 0.6–0.8% vanadium (V).
  • Has 0.07–0.15% titanium (Ti).
  • Contains a maximum of 0.2% aluminum (Al).
  • Has a maximum copper (Cu) content of 0.02%.
  • Contains trace amounts of arsenic (As) (between 0.001% and 0.01%).
  • Has a maximum boron (B) content of 0.02%.
• Mechanical Properties (in quenched and tempered conditions):
  • Tensile Strength (Rm): 820–1000 MPa.
  • Yield Strength (Rp0.2): 660 MPa.
  • Charpy V-notch Impact Toughness (KV) at +20°C: 27–40 J.
  • Minimum Elongation at Fracture (A): 15%.
  • Reduction of Area at Fracture (Z): 50%.

This material is commonly used for screws and other fasteners in applications with extreme temperatures, as its properties are optimized for such conditions.