EN 10083-2:2006 C40R Steel: Specifications & Listings
EN 10083-2:2006 C40R: A medium carbon steel for quenching and tempering to EN 10083-2:2006 (steel number 1.1189, non alloy special steel), with controlled sulphur of 0.020 to 0.040% for better machinability. Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 650 to 800 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
0.37-0.44
<=0.40
<=0.63
0.50-0.80
<=0.10
<=0.40
<=0.030
0.020-0.040
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
16% min
Tensile Strength
650 to 800 MPa
Yield Strength
460 MPa min
More data from EN 10083-2:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.1189
Steel class
Non alloy special steel (clause 4.1)
Pair grade
C40E (1.1186) has the same limits except sulphur, max. 0.035
Deoxidation
Killed (clause 6.2)
Sulphur range
Controlled sulphur range improves machinability (clause 7.2)
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 (%)
Impact KV, min (J)
d <= 16 mm, t <= 8 mm
460
650 to 800
16
35
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
400
630 to 780
18
40
30
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
350
600 to 750
19
45
30
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; KV on longitudinal Charpy V-notch test pieces, average of 3 values, no single value below 70% of the minimum. 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
320
580
16
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
290
550
17
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
260
530
17
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
Shearability
Shearable in the untreated condition under suitable conditions (clause 7.3.3)
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
60
60
59
57
53
47
39
34
31
30
29
28
27
Minimum, HRC
51
46
35
27
25
24
23
22
21
20
Applies when ordered with the symbol +H; otherwise for guidance only. End quench test to EN ISO 642, quenching from 870 ± 5 deg C (Table 13).
Source: EN 10083-2:2006, Table 5
Restricted hardenability (+HL)Table 6
Symbol
1 mm (HRC)
4 mm (HRC)
+HL4
-
27 to 46
+HL14
51 to 57
27 to 46
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
Heat treatmentTable 13
Quenching
830 to 870 deg C
Quenching agent
Water or oil
Tempering
550 to 660 deg C
End quench test
870 ± 5 deg C
Normalizing
850 to 910 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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