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EN 1.7709 Details

1.7709 Application:high temperature boiler steels for energy industries

Category Type Grade Designations
Grades Structural Steel 1.7709 European - EN , EN 10269-1999 - Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

Chemical composition(wt.%) of 1.7709 grade: EN 10269-1999

Elements Min.(≥) Max.(≤)
C 0.17 0.25
Mn 0.40 0.80
Si - 0.40
P - 0.030
S - 0.030
Cr 1.20 1.50
Ni - 0.60
Mo 0.55 0.80
V 0.25 0.35
Al - 0.03
Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

Mechanical properties of grade 1.7709 EN 10269-1999

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
461 (≥) 871 (≥) 24 12 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 311

Physical properties of grade 1.7709 EN 10269-1999

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
759 (≥) 377 (≥) 24 44 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 123
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
549 745 172

1.7709 - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
21CMoV5-7 DIN Germany
high temperature boiler steels for energy industries
21CMoV5-7 EN European
high temperature boiler steels for energy industries
1.7709 EN European
high temperature boiler steels for energy industries
21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 DIN Germany
high temperature boiler steels for energy industries

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