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

Item specifics

Standard
EN 10269
Applications
steam turbines, rotor blades, shaft forgings, etc
Heat treatment
Normalized,Quenching and Tmenpering
Surface condition
Black or bright surface

Review

Description

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