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DIN 21CMoV5-7 Details

DIN 21CMoV5-7 Standard Download

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21CMoV5-7 Application:high temperature boiler steels for energy industries

Category Type Grade Designations
Grades Structural Steel 21CMoV5-7 Germany - DIN ,

Chemical composition(wt.%) of 21CMoV5-7 grade:

Elements Min.（≥） Max.（≤） Similar Remarks
C 0.17 0.25
Mn 0.30 0.50
Si 0.30 0.60
P - 0.035
S - 0.035
Cr 1.20 1.50
Ni - 0.60
Mo 1.00 1.20
V 0.25 0.35
21CMoV5-7 alloy structural steel and its 1.7709 replacement alloys belong to the group of high temperature boiler steels for energy industries. They are used in the production of components/subassemblies for the power industry, working at the temperatures up to 550 oC for small parts and for large forgings. The main applications of these grades of steel are rotors of steam turbines, rotor blades, shaft forgings, reservoirs and covers for up to 550 ℃ temperatures, nuts, tubes for high temperatures up to 540 ℃.

Mechanical properties of grade 21CMoV5-7

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)
883 (≥) 185 (≥) 22 14 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 434

Physical properties of grade 21CMoV5-7

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
286 (≥) 755 (≥) 41 43 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 333
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
368 647 498

21CMoV5-7 - 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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