EN 10083-2:2006 C50E Steel: Specifications & Listings
EN 10083-2:2006 C50E: A higher carbon steel for quenching and tempering to EN 10083-2:2006 (steel number 1.1206, non alloy special steel), with sulphur max. 0.035%, also used for flame or induction hardening. Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 750 to 900 MPa for ruling sections up to 16 mm.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Cr+Mo+Ni
Mn
Mo
Ni
P
S
Si
0.47-0.55
<=0.40
<=0.63
0.60-0.90
<=0.10
<=0.40
<=0.030
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
13% min
Hardness
Soft annealed (+A): 217 HBW max
Tensile Strength
750 to 900 MPa
Yield Strength
520 MPa min
More data from EN 10083-2:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.1206
Steel class
Non alloy special steel (clause 4.1)
Pair grade
C50R (1.1241) has the same limits except sulphur, controlled 0.020 to 0.040
Deoxidation
Killed (clause 6.2)
Sulphur, flat products
May be restricted to max. 0.010 if agreed at enquiry and order (Table 3, footnote e)
Improved machinability
Sulphur up to about 0.10 may be supplied on request; the manganese upper limit may then rise by 0.15 (Table 3, footnote c)
Restricted options
Without hardenability or mechanical property requirements, a carbon range of 0.05 and/or Cr + Mo + Ni max. 0.45 may be agreed (Table 3, footnote d)
Elements not quoted in Table 3 are not intentionally added without the purchaser's agreement, other than for finishing the heat.
Source: EN 10083-2:2006, Table 3 and its notes
Mechanical properties, quenched and tempered (+QT)3 sections
Ruling section
Yield strength Re, min (MPa)
Tensile strength Rm (MPa)
Elongation A, min (%)
Reduction of area Z, min (%)
d <= 16 mm, t <= 8 mm
520
750 to 900
13
30
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
460
700 to 850
15
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
400
650 to 800
16
40
Re is the upper yield strength or, if no yield phenomenon occurs, the 0.2% proof strength; A on gauge length 5.65 times the root of the original cross section. Ruling sections as in EN 10083-1:2006, Annex A.
Source: EN 10083-2:2006, Table 9
Mechanical properties, normalized (+N)3 sizes
Size
Yield strength Re, min (MPa)
Tensile strength Rm, min (MPa)
Elongation A, min (%)
d <= 16 mm, t <= 16 mm
355
650
13
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
320
610
14
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
290
590
14
For plates over 10 mm and bars over 100 mm diameter a hardness test may be agreed instead of the tensile test, converted to tensile strength according to EN ISO 18265 (clause 7.1.4).
Source: EN 10083-2:2006, Table 10
Maximum hardness by delivery conditionTable 8
Treated to improve shearability (+S), max
255 HBW
Soft annealed (+A), max
217 HBW
Values also apply to the grades with hardenability requirements (+H, +HH, +HL); not applicable to continuously cast slabs not further deformed.
Source: EN 10083-2:2006, Table 8
Hardenability, end quench test (+H)Hardness band
Hardness band (HRC, minimum to maximum) by distance from the quenched end (mm)
1
2
3
4
5
6
7
8
9
10
11
13
15
20
25
30
Distance from quenched end (mm)
1
2
3
4
5
6
7
8
9
10
11
13
15
20
25
30
Maximum, HRC
63
62
61
60
58
55
50
43
36
35
34
33
32
31
29
28
Minimum, HRC
56
53
44
34
31
30
30
29
28
27
26
25
24
23
20
Applies when ordered with the symbol +H; otherwise for guidance only. End quench test to EN ISO 642, quenching from 850 ± 5 deg C (Table 13).
Source: EN 10083-2:2006, Table 5
Restricted hardenability (+HH)Table 6
Symbol
1 mm (HRC)
5 mm (HRC)
+HH5
-
40 to 58
+HH15
58 to 63
40 to 58
Table 6 lists +HH grades under the E grade and +HL grades under the R grade. The figure after the symbol gives the distances (mm) at which the limits apply.
Source: EN 10083-2:2006, Table 6
Surface hardness after flame or induction hardeningTable 11
Surface hardness, min
56 HRC
Applies to cross sections up to 100 mm after quenching and tempering and surface hardening to Table 13, followed by stress relieving at 150 to 180 deg C for about 1 h; may also be agreed after normalizing. Surface decarburization may lower the surface hardness. Fine grain (option A.3) must be ordered for flame or induction hardening (clause 7.4.1).
Source: EN 10083-2:2006, Table 11
Heat treatmentTable 13
Quenching
810 to 850 deg C
Quenching agent
Oil or water
Tempering
550 to 660 deg C
End quench test
850 ± 5 deg C
Normalizing
830 to 890 deg C
Guidance values except the end quench test temperature, which is mandatory. Lower quenching temperatures generally for water, upper for oil; austenitizing at least 30 min, tempering at least 60 min (guide values).
Source: EN 10083-2:2006, Table 13
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