EN 10083-1:1991 2C30 Steel: Specifications & Listings
EN 10083-1:1991 2C30: A medium carbon special steel for quenching and tempering to EN 10083-1:1991 (printed 2 C 30), with sulphur max. 0.035%. Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 600 to 750 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
0.27-0.34
<=0.40
<=0.63
0.50-0.80
<=0.10
<=0.40
<=0.035
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
18% min
Tensile Strength
600 to 750 MPa
Yield Strength
400 MPa min
More data from EN 10083-1:1991
From the standard
Other composition limitsTable III and its notes
Designation as printed
2 C 30
Pair grade
3C30 has the same limits except sulphur, controlled 0.020 to 0.040
Availability
Printed in brackets: introduced partly for the first time in this standard and not available from stock in all countries (Table III, note 6)
Improved machinability
Steels with lead or higher sulphur, up to about 0.100% S, may be supplied on request (Table III, note 3)
Restricted options
Without hardenability or quenched and tempered or normalized property requirements, a carbon range of 0.05 and/or Cr + Mo + Ni below 0.45 may be agreed (Table III, note 5)
Elements not quoted in Table III are not intentionally added without the purchaser's agreement, other than for finishing the heat. With hardenability requirements, slight deviations within Table IV are permitted except for carbon, phosphorus and sulphur.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table III and its notes
Mechanical properties, quenched and tempered3 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
400
600 to 750
18
40
40
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
350
550 to 700
20
45
40
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
300
500 to 650
21
50
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; KV on longitudinal ISO V-notch test pieces, average of 3 values, no single value below 70% of the minimum. Ruling sections as in Appendix B. Sizes not listed are not covered by the standard. The 40 to 100 mm values apply to diameters up to 63 mm or thicknesses up to 35 mm (Table IX, note 3).
Source: EN 10083-1:1991 (UNI EN 10083-1), Table IX
Mechanical properties, normalized3 sizes
Size
Yield strength Re, min (MPa)
Tensile strength Rm, min (MPa)
Elongation A, min (%)
d <= 16 mm, t <= 16 mm
280
510
20
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
250
480
21
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
230
460
21
Values also apply to the grades with hardenability requirements (H, HH, HL). Sizes not listed are not covered by the standard.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table X
Maximum hardness by delivery conditionTable VIII
Shearability
Shearable in the untreated condition under suitable conditions (clause 5.3.2.3)
Values also apply to the grades with hardenability requirements (H, HH, HL); not applicable to continuously cast slabs not further deformed.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table VIII
Heat treatmentTable XIII
Quenching
850 to 890 deg C
Quenching agent
Water
Tempering
550 to 660 deg C
Normalizing
870 to 910 deg C
Guidance values except the end quench test temperature, which is binding. Lower quenching temperatures generally for water, upper for oil; austenitizing at least 30 min, tempering at least 60 min (guide values).
Source: EN 10083-1:1991 (UNI EN 10083-1), Table XIII
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