EN 10083-2:2006 C55 Steel: Specifications & Listings
EN 10083-2:2006 C55: A higher carbon steel for quenching and tempering to EN 10083-2:2006 (steel number 1.0535, 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 800 to 950 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
0.52-0.60
<=0.40
<=0.63
0.60-0.90
<=0.10
<=0.40
<=0.045
<=0.045
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
12% min
Hardness
Soft annealed (+A): 229 HBW max
Tensile Strength
800 to 950 MPa
Yield Strength
550 MPa min
Typical Available Sizes
Round Bar
10mm–150mm dia
Flat Bar
16×5mm–150×30mm
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
1.0535
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
550
800 to 950
12
30
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
490
750 to 900
14
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
420
700 to 850
15
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
370
680
11
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
330
640
12
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
300
620
12
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
229 HBW
Values also apply to the grades with hardenability requirements (+H, +HH, +HL); not applicable to continuously cast slabs not further deformed. Depending on the cast and the dimensions, particularly for +HH grades, soft annealing may be necessary.
Source: EN 10083-2:2006, Table 8
Heat treatmentTable 13
Quenching
810 to 850 deg C
Quenching agent
Oil or water
Tempering
550 to 660 deg C
Normalizing
825 to 885 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).