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
<=1100 MPa
Hardness
<=320 HB
Condition
Annealed (+A), conditions 1C, 1E, 1D, 1X, 1G and 2D, size range not stated; hardness for guidance only
More data from EN 10088-3:2014
From the standard
Mechanical properties by heat treatment condition7 rows
Thickness or diameter (mm)
Condition
Hardness HBW, max (guidance)
Rp0.2 min (MPa)
Rm (MPa)
A min, longitudinal (%)
A min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
-
+A
320
-
max. 1100
-
-
-
-
up to 160
+QT700
-
520
700 to 850
15
-
70
-
over 160 to 250
+QT700
-
520
700 to 850
-
12
-
50
up to 160
+QT780
-
620
780 to 980
15
-
70
-
over 160 to 250
+QT780
-
620
780 to 980
-
12
-
50
up to 160
+QT900
-
800
900 to 1100
12
-
50
-
over 160 to 250
+QT900
-
800
900 to 1100
-
10
-
40
+A = annealed, +QT = quenched and tempered; for rods only the tensile strength values apply.
Source: EN 10088-3:2014, Table 11
Proof strength at elevated temperature7 temperatures
Temperature (deg C)
Rp0.2 min, +QT650 (MPa)
Rp0.2 min, +QT780 (MPa)
Rp0.2 min, +QT900 (MPa)
100
500
590
720
150
490
575
690
200
480
560
665
250
470
545
640
300
460
530
620
350
450
515
-
400
-
-
-
Minimum values.
Source: EN 10088-3:2014, Table 23
Hot forming and heat treatment4 conditions
Condition
Annealing temperature (deg C)
Cooling after annealing
Quenching temperature (deg C)
Quenching medium
Tempering temperature (deg C)
+A
600 to 650
furn., air
-
-
-
+QT700
-
-
950 to 1050
oil, air
650 to 700 + 600 to 620
+QT780
-
-
950 to 1050
oil, air
550 to 600
+QT900
-
-
950 to 1050
oil, air
520 to 580
Hot forming 1150 to 900 deg C, cooling: air. Informative guideline.
Source: EN 10088-3:2014, Table A.4
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