EN 10083-1:1991 3C35 Steel: Specifications & Listings
EN 10083-1:1991 3C35: A medium carbon special steel for quenching and tempering to EN 10083-1:1991 (printed 3 C 35), 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 630 to 780 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
0.32-0.39
<=0.40
<=0.63
0.50-0.80
<=0.10
<=0.40
<=0.035
0.020-0.040
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
17% min
Tensile Strength
630 to 780 MPa
Yield Strength
430 MPa min
More data from EN 10083-1:1991
From the standard
Other composition limitsTable III and its notes
Designation as printed
3 C 35
Pair grade
2C35 has the same limits except sulphur, max. 0.035
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
430
630 to 780
17
40
35
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
380
600 to 750
19
45
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
320
550 to 700
20
50
35
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.
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
300
550
18
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
270
520
19
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
245
500
19
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
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
58
57
55
53
49
41
34
31
28
27
26
25
24
23
20
Minimum, HRC
48
40
33
24
22
20
Applies when ordered as 3C35 H. Provisional values for non alloy steels; a manufacturer whose band falls outside these limits informs the purchaser at ordering (Table V, note 1). End quench test at 870 ± 5 deg C (Table XIII).
Source: EN 10083-1:1991 (UNI EN 10083-1), Table V
Restricted hardenability (HH, HL), provisionalTable VI
Symbol
1 mm (HRC)
4 mm (HRC)
HH4
-
34 to 53
HH14
51 to 58
34 to 53
HL4
-
24 to 43
HL14
48 to 55
24 to 43
Apply to both the 2C and 3C grade. The figure after the symbol gives the distances (mm) at which the limits apply.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table VI
Heat treatmentTable XIII
Quenching
840 to 880 deg C
Quenching agent
Water or oil
Tempering
550 to 660 deg C
End quench test
870 ± 5 deg C
Normalizing
860 to 900 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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