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
PN	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
EN / DIN	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
GOST	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
DIN	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
AFNOR	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
MSZ	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