Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
Cr
Mo
Ni
N
<=0.05
<=0.70
<=1.50
<=0.040
<=0.015
12.0-14.0
0.30-0.70
3.5-4.5
>=0.020
Mechanical Properties
Tensile Strength
780-980 MPa
Yield Strength
>=630 MPa
Elongation
>=15%
Condition
Quenched and tempered (+QT780), hot rolled plate, up to 75 mm thick
More data from EN 10088-2:2014
From the standard
Mechanical properties by condition2 conditions
Product form
Max thickness (mm)
Condition
Rp0.2 min (MPa)
Rm (MPa)
A80 min, under 3 mm thick (%)
A min, 3 mm and over (%)
Hot rolled plate
75
+QT780
630
780 to 980
15
15
Hot rolled plate
75
+QT900
800
900 to 1100
11
11
+A = annealed, +QT = quenched and tempered.
Source: EN 10088-2:2014, Table 10
Impact energy KV2 (ISO-V)2 rows
Product form
Max thickness (mm)
Condition
KV2 min (J)
Hot rolled plate
75
+QT780
70
Hot rolled plate
75
+QT900
70
Applies to products more than 10 mm thick, ISO-V notch.
Source: EN 10088-2:2014, Table 10
Proof strength at elevated temperature7 temperatures
Temperature (deg C)
Rp0.2 min, +QT780 (MPa)
Rp0.2 min, +QT900 (MPa)
100
590
720
150
575
690
200
560
665
250
545
640
300
530
620
350
515
-
400
-
-
Minimum values.
Source: EN 10088-2:2014, Table 15
Hot forming and heat treatment2 conditions
Condition
Annealing temperature (deg C)
Quenching temperature (deg C)
Quenching medium
Tempering temperature (deg C)
+QT780
-
950 to 1050
oil, air, water
560 to 640
+QT900
-
950 to 1050
oil, air, water
510 to 590
Hot forming 1150 to 900 deg C, cooling: air. Informative guideline.
Source: EN 10088-2:2014, Table A.4
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