EN 10083-1:1996 C30E Steel: Specifications & Listings
EN 10083-1:1996 C30E: A medium carbon special steel for quenching and tempering to EN 10083-1:1991 + A1:1996 (steel number 1.1178), with sulphur max. 0.035%. Supplied as semi-finished products, bars, rod, wide flats, sheet, plate and strip, and forgings (clause 1.1). 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 10083-1:1996
From the standard
Other composition limitsTable 3 and its notes
Designation as printed
C30E
Steel number
1.1178
Pair grade
C30R has the same limits except sulphur, controlled 0.020 to 0.040
Availability
Printed in brackets: introduced for the first time in this standard and not available from stock in all countries (Table 3, note 6)
Improved machinability
Steels with lead or higher sulphur, up to about 0.100% S, may be supplied on request (Table 3, note 3)
Restricted options
Without hardenability or quenched and tempered or normalized property requirements, the carbon range may be restricted to 0.05% and/or the sum Cr + Mo + Ni to max. 0.45% by agreement (Table 3, note 5)
Elements not quoted in Table 3 are not intentionally added without the purchaser's agreement, other than for finishing the heat. With hardenability requirements, slight deviations within Table 4 are permitted except for carbon, phosphorus and sulphur.
Source: EN 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 3 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 Charpy V-notch test pieces, average of 3 values, no single value below 70% of the minimum average value. Ruling sections as in Annex A. 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 9, note 3).
Source: EN 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 9
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 <= 150 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 + A1:1996 (DIN EN 10083-1:1996-10), Table 10
Maximum hardness by delivery conditionTable 8
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 worked.
Source: EN 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 8
Heat treatmentTable 12
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 + A1:1996 (DIN EN 10083-1:1996-10), Table 12
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