EN 10083-3:2006 37Cr4 Steel: Specifications & Listings
EN 10083-3:2006 37Cr4: A chromium alloy steel for quenching and tempering to EN 10083-3:2006 (steel number 1.7034), also used for flame or induction hardening. Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 950 to 1150 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
Mn
P
S
Si
0.34-0.41
0.90-1.20
0.60-0.90
<=0.025
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
11% min
Hardness
Soft annealed (+A): 235 HBW max
Tensile Strength
950 to 1150 MPa
Yield Strength
750 MPa min
More data from EN 10083-3:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.7034
Steel class
Alloy special steel (clause 4.1)
Pair grade
37CrS4 (1.7038) has the same limits except sulphur, controlled 0.020 to 0.040
Deoxidation
Killed
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. With hardenability or quenched and tempered property requirements, slight deviations within Table 4 are permitted except for carbon, phosphorus and sulphur.
Source: EN 10083-3:2006, 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 (%)
Impact KV, min (J)
d <= 16 mm, t <= 8 mm
750
950 to 1150
11
35
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
630
850 to 1000
13
40
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
510
750 to 900
14
40
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 Charpy V-notch test pieces, average of 3 values, no single value below 70% of the minimum. Ruling sections as in EN 10083-1:2006, Annex A. Sizes not listed are not covered by the standard.
Source: EN 10083-3:2006, Table 8
Maximum hardness by delivery conditionTable 7
Treated to improve shearability (+S), max
255 HBW
Soft annealed (+A), max
235 HBW
Values also apply to the grades with hardenability requirements (+H, +HH, +HL); not applicable to continuously cast slabs not further deformed.
Source: EN 10083-3:2006, Table 7
Hardenability, end quench test (+H)Hardness band
Hardness band (HRC, minimum to maximum) by distance from the quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
45
50
Distance from quenched end (mm)
1.5
3
5
7
9
11
13
15
20
25
30
35
40
45
50
Maximum, HRC
59
59
58
57
55
52
50
48
42
39
37
36
35
34
33
Minimum, HRC
51
50
48
44
39
36
33
31
26
24
22
20
Applies when ordered with the symbol +H. End quench test to EN ISO 642, quenching from 850 ± 5 deg C (Table 11).
Source: EN 10083-3:2006, Table 5
Restricted hardenability (+HH, +HL), HRCTable 6
Limit
1.5 mm
3 mm
5 mm
7 mm
9 mm
11 mm
13 mm
15 mm
20 mm
25 mm
30 mm
35 mm
40 mm
45 mm
50 mm
+HH max.
59
59
58
57
55
52
50
48
42
39
37
36
35
34
33
+HH min.
54
53
51
48
44
41
39
37
31
29
27
25
24
23
22
+HL max.
56
56
55
53
50
47
44
42
37
34
32
31
30
29
28
+HL min.
51
50
48
44
39
36
33
31
26
24
22
20
-
-
-
Restricted scatter bands by distance from the quenched end.
Source: EN 10083-3:2006, Table 6
Surface hardness after flame or induction hardeningTable 9
Surface hardness, min
51 HRC
Applies after quenching and tempering and surface hardening to Table 11, followed by stress relieving at 150 to 180 deg C for about 1 h, for cross sections up to 100 mm diameter. Surface decarburization may lower the surface hardness.
Source: EN 10083-3:2006, Table 9
Heat treatmentTable 11
Quenching
825 to 865 deg C
Quenching agent
Oil or water
Tempering
540 to 680 deg C
End quench test
850 ± 5 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).
Source: EN 10083-3:2006, Table 11
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