EN 10083-1:1996 37CrS4 Steel: Specifications & Listings
EN 10083-1:1996 37CrS4: A chromium alloy steel for quenching and tempering to EN 10083-1:1991 + A1:1996 (steel number 1.7038), with controlled sulphur of 0.020 to 0.040% for better machinability. Supplied as semi-finished products, bars, rod, wide flats, sheet, plate and strip, and forgings (clause 1.1). 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
<=0.035
0.020-0.040
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
11% min
Hardness
Soft annealed: 235 HB max
Tensile Strength
950 to 1150 MPa
Yield Strength
750 MPa min
More data from EN 10083-1:1996
From the standard
Other composition limitsTable 3 and its notes
Designation as printed
37CrS4
Steel number
1.7038
Pair grade
37Cr4 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 3, note 3)
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
750
950 to 1150
11
35
30
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 average value. Ruling sections as in Annex A. Sizes not listed are not covered by the standard.
Source: EN 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 9
Maximum hardness by delivery conditionTable 8
Treated to improve shearability (+S), max
255 HB
Soft annealed (+A), max
235 HB
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
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 at 850 ± 5 deg C (Table 12).
Source: EN 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 5
Restricted hardenability (+HH, +HL), HRCTable 7
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 10083-1:1991 + A1:1996 (DIN EN 10083-1:1996-10), Table 7
Heat treatmentTable 12
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 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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