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21CrMoV5-11 1.8070 21CrMoV5-7 1.7709 Hot Forged Alloy Steel Round Bar

Group Round Forgings
Min. Order 1 metric ton
Terms of Payment L/C, D/A, D/P, T/T
Update Time 2020-05-25
Item specifics
StandardEN 10269
Applicationssteam turbines, rotor blades, shaft forgings, etc
Heat treatmentNormalized,Quenching and Tmenpering
Surface conditionBlack or bright surface

Description of 1.8070 21CrMoV5-11

21CrMoV5-7 / 21CrMoV5-11 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 ℃ for small parts and for large forgings.

Applications of 1.8070 21CrMoV5-11

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 ℃.
Chemical Composition(%) of 1.8070 21CrMoV5-11
Standards
Steel Grades
Chemical Composition %
C:
Mn:
Si:
P:
S:
Cr:
Ni:
Mo:
V:
Al:
Cu:
PN
21HMF
0.17 - 0.25
0.3 - 0.5
0.3 - 0.6
<0.035
<0.035
1.2 - 1.5
<0.6
1.0 - 1.2
0.25 - 0.35
-
-
EN / DIN
21CrMoV5-7 - 21 CrMoV 5-7 - 1.7709
0.17 - 0.25
0.4 - 0.8
<0.4
<0.025
<0.030
1.2 - 1.5
<0.6
0.55 - 0.80
0.20 - 0.35
<0.3
-
GOST
25Ch1M1F - 21Kh1M1F - 25Х1М1Ф
0.22 - 0.29
0.4 - 0.7
0.17 - 0.37
<0.030
<0.025
1.5 - 1.8
<0.3
0.25 - 0.35
0.15 - 0.30
-
<0.2
DIN
21CrMoV5-11 - 21 CrMoV 5-11 - 1.8070
0.17 - 0.25
0.3 - 0.6
0.30 - 0.60
<0.035
<0.035
1.2 - 1.5
<0.6
1.0 - 1.2
0.25 - 0.35
-
-
AFNOR
20CDV5-07 - 20 CDV 5-07 - 20CDV5.07
0.17 - 0.24
0.3 - 0.6
<0.5
<0.015
<0.015
1.1 - 1.5
<0.5
0.5 - 0.8
0.15 - 0.35
-
-
MSZ
MCrMoV
0.17 - 0.25
0.5 - 0.8
0.17 - 0.37
<0.035
<0.035
1.2 - 1.5
0.3 - 0.6
0.8 - 1.0
0.30 - 0.45
-
<0.3

Thermal treatment of 1.8070 21CrMoV5-11
Softening at 650 °C with slow cooling
Slow relief annealing at 530 °C at furnace to at least 200
Normalizing at 950 - 980℃ with cooling in calm air
Hardening at 930 - 950℃ in water, 940 - 960℃ in oil

Tempering at a temperature of 650 ° c in the air for many hours depending on the size of the material

Mechanical properties of 1.8070 21CrMoV5-11 +QT
Tensile strength, Rm = 700 - 850 MPa
Yield point, Re > 550 MPa
Elongation, A > 16%
Contraction, Z > 60%
Notch toughness, KV20℃ > 63 J

Hardness after annealed HBW: 205 ~ 250

Yield point at individual temperatures of 1.8070 21CrMoV5-11
Re przy 200℃ = 500 MPa
Re przy 300℃ = 460 MPa
Re przy 400℃ = 412 MPa
Re przy 500℃ = 334 MPa

Re przy 550℃ = 275 MPa

Permissible temperature of application of steel in hydrogen containing environments depends on its partial pressure 21CrMoV5-11

Temperatures ℃
600
380
330
325
320
310
300
280
Partial pressure kG/cm2
1
100
150
200
300
400
500
800
Creep limit and creep resistance of 21HMF / 21CrMoV5-11 / 1.8070 according to tests on rotors at 550 ℃
Time, h
10
102
103
104
105
Creep limit, R0,1 (N/mm2)
~200
~158
~110
~64
-
Creep resistance, Rz (N/mm2)
~310
~280
~240
~195
~123