EN 1.7729 (20CrMoVTiB4-10) Steel
Other Steels
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength910MPa
Yield Strength660MPa
Brinell Hardness270HB
Maximum Service Temperature430°C
Chemical Composition
C
0.17 to 0.23%
CR
0.9 to 1.2%
NI
0 to 0.2%
MO
0.9 to 1.1%
MN
0.35 to 0.75%
SI
0 to 0.4%
P
0 to 0.020%
S
0 to 0.015%
CU
0 to 0.2%
TI
0.070 to 0.15%
V
0.6 to 0.8%
AL
0.015 to 0.080%
B
0.0010 to 0.010%
AS
0 to 0.020%
SN
0 to 0.020%
FE
94.8 to 97%
Mechanical
A - Min. elongation at fracture (%) (+QT)
15
+QT
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
17 %
Fatigue Strength
500 MPa
Impact Strength: V-Notched Charpy
46 J
KV - Impact energy (J) (+QT)
+20° 27-40
+QT
Poisson's Ratio
0.29
R p0.2 0.2% proof strength (MPa) (+QT)
660
+QT
Reduction in Area
56 %
Rm - Tensile strength (MPa) (+QT)
820-1000
+QT
Shear Modulus
73 GPa
Shear Strength
560 MPa
Tensile Strength: Ultimate (UTS)
910 MPa
Tensile Strength: Yield (Proof)
750 MPa
Hardness
+A Soft annealed +AC Annealed to achieve spheroidization of the carbides +AR As rolled +AT Solution annealed +C Cold drawn / hard +CR Cold rolled +FP Treated to ferrite-pearlite structure and hardness range +I Isothermal annealing +LC Cold drawn / soft +M Thermo mechanical rolling +N Normalized +NT Normalized and tempered
+P Precipitation hardened +PE Peeled +QA Air quenched and tempered +QL Liquid quenched and tempered +QT Quenched and tempered +S Treated to improve shearability +SH As rolled and turned +SR Cold drawn and stress relieved +T Tempered +TH Treated to hardness range +WW Warm worked +U Untreated
+A
Brinell Hardness
270
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
430 °C
Melting Completion (Liquidus)
1470 °C
Melting Onset (Solidus)
1430 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
40 W/m-K
Thermal Diffusivity
11 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
27 points
Electrical
Electrical Conductivity: Equal Volume
7.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Other
Z - Reduction in cross section on fracture (%) (+QT)
50
+QT
Calculated
PREN (Pitting Resistance)
4.4
Resilience: Ultimate (Unit Rupture Work)
150 MJ/m 3
Resilience: Unit (Modulus of Resilience)
1500 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
32 points
Strength to Weight: Bending
27 points
Environmental
Base Metal Price
3.8 % relative
Embodied Carbon
3.3 kg CO 2 /kg material
Embodied Energy
49 MJ/kg
Embodied Energy
49 MJ/kg 21 x 10 3 BTU/lb
Embodied Water
59 L/kg
Embodied Water
59 L/kg 7.0 gal/lb
Registered Designations & Aliases
1.77291.772920CrMoVTiB4-1020CrMoVTiB4-10EN 1.7729 (20CrMoVTiB4-10) Steel
Standards
EN 10269 EN 10269: 1999 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10269 EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10269 EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties Creep-Resistant Steels, Fujio Abe et al. (editors), 2008