EN 10083-2:2006 C40 Steel: Specifications & Listings
EN 10083-2:2006 C40: A medium carbon steel for quenching and tempering to EN 10083-2:2006 (steel number 1.0511, non alloy quality steel). 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
<=0.045
<=0.045
<=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
Typical Available Sizes
Round Bar
10mm–250mm dia
Flat Bar
16×5mm–200×50mm
Square Bar
12mm–150mm
Hex Bar
13mm–100mm A/F
Sizes are indicative. Contact seller for exact availability.
More data from EN 10083-2:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.0511
Steel class
Non alloy quality steel (clause 4.1)
Deoxidation
Killed (clause 6.2)
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)
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
460
650 to 800
16
35
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
400
630 to 780
18
40
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
350
600 to 750
19
45
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
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
Heat treatmentTable 13
Quenching
830 to 870 deg C
Quenching agent
Water or oil
Tempering
550 to 660 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).