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DIN 21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 Details

21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 Application:high temperature boiler steels for energy industries

Category Type Grade Designations
Grades Structural Steel 21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 Germany - DIN ,

Chemical composition(wt.%) of 21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 grade:

Elements Min.(≥) Max.(≤)
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

Mechanical properties of grade 21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070

Yield Strength,Rp 0.2(MPa)

Condition Min Max Similar Note
QT 550

Tensile Strength,Rm(MPa)

Condition Min Max Similar Note
QT 700 850

Impact,Kv/Ku(J)

Condition Min Max Similar Note
QT 63

Elongation,A(%)

Condition Min Max Similar Note
QT 16

Reduction of area,(%)

Condition Min Max Similar Note
QT 60

Hardness

Condition Type Min Max Similar Note

Related properties

200℃ - Yield Strength 500 MPa
300℃ - Yield Strength 460 MPa
400℃ - Yield Strength 412 MPa
500℃ - Yield Strength 334 MPa
550℃ - Yield Strength 275 MPa
600℃ - steel in hydrogen containing Partial pressure kG/cm2 = 1
380℃ - steel in hydrogen containing Partial pressure kG/cm2 = 100
330℃ - steel in hydrogen containing Partial pressure kG/cm2 = 150
325℃ - steel in hydrogen containing Partial pressure kG/cm2 = 200
320℃ - steel in hydrogen containing Partial pressure kG/cm2 = 300
310℃ - steel in hydrogen containing Partial pressure kG/cm2 = 400
300℃ - steel in hydrogen containing Partial pressure kG/cm2 = 500
280℃ - steel in hydrogen containing Partial pressure kG/cm2 = 800

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 ℃.

21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 - 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
21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 DIN Germany
high temperature boiler steels for energy industries

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