EN 1.7378 (7CrMoVTiB10-10) Chromium-Molybdenum Steel
Other Steels
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength700MPa
Yield Strength450MPa
Brinell Hardness210HB
Maximum Service Temperature460°C
Chemical Composition
C
0.050 to 0.1%
CR
2.2 to 2.6%
MO
0.9 to 1.1%
MN
0.3 to 0.7%
SI
0.15 to 0.45%
N
0 to 0.010%
P
0 to 0.020%
S
0 to 0.010%
TI
0.050 to 0.1%
V
0.2 to 0.3%
AL
0 to 0.020%
B
0.0015 to 0.0070%
FE
94.6 to 96.1%
Mechanical
A - Min. elongation at fracture (%) longitud., (+NT)
17
+NT
A - Min. elongation at fracture (%) transverse, (+NT)
15
+NT
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
17 %
Fatigue Strength
330 MPa
Impact Strength: V-Notched Charpy
38 J
KV - Impact energy (J) longitud., (+NT)
+20° 40
+NT
KV - Impact energy (J) transverse, (+NT)
+20° 27
+NT
Poisson's Ratio
0.29
R p0.2 0.2% proof strength (MPa) (+NT)
450
+NT
R p0.2 0.2% proof strength (MPa) (+NT)
430
+NT
Rm - Tensile strength (MPa) (+NT)
565-840
+NT
Shear Modulus
74 GPa
Shear Strength
430 MPa
Tensile Strength: Ultimate (UTS)
700 MPa
Tensile Strength: Yield (Proof)
490 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
210
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
460 °C
Melting Completion (Liquidus)
1470 °C
Melting Onset (Solidus)
1430 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
39 W/m-K
Thermal Diffusivity
10 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
20 points
Electrical
Electrical Conductivity: Equal Volume
7.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Other
Nominal thickness(mm):
to 16
Nominal thickness(mm):
16 - 60
Calculated
PREN (Pitting Resistance)
5.8
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m 3
Resilience: Unit (Modulus of Resilience)
630 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
25 points
Strength to Weight: Bending
22 points
Environmental
Base Metal Price
4.0 % relative
Embodied Carbon
2.3 kg CO 2 /kg material
Embodied Energy
33 MJ/kg
Embodied Energy
33 MJ/kg 14 x 10 3 BTU/lb
Embodied Water
61 L/kg
Embodied Water
61 L/kg 7.2 gal/lb
Registered Designations & Aliases
1.73781.73787CrMoVTiB10-107CrMoVTiB10-10EN 1.7378 (7CrMoVTiB10-10) Chromium-Molybdenum Steel
Standards
EN 10216-2 EN 10216-2: 2014 Seamless steel tubes for pressure purposes. Technical delivery conditions. Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-2 EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-2 EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011 Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005