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

21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 Structural Steel

21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 - Specification & Application

high temperature boiler steels for energy industries

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

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

Yield Strength,R_{p 0.2}(MPa)

Condition	Min	Max	Similar	Note
QT	550

Tensile Strength,R_m(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

21CrMoV5-7, 1.7709, 21CrMoV5-11, 1.8070 - Detail

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 ℃.