EN 10083-1:1991 37Cr4 Steel: Specifications & Listings
EN 10083-1:1991 37Cr4: A chromium alloy steel for quenching and tempering to EN 10083-1:1991 (printed 37 Cr 4). 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
<=0.035
<=0.035
<=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 10083-1:1991
From the standard
Other composition limitsTable III and its notes
Designation as printed
37 Cr 4
Pair grade
37CrS4 has the same limits except sulphur, controlled 0.020 to 0.040
Improved machinability
Steels with lead or higher sulphur, up to about 0.100% S, may be supplied on request (Table III, note 3)
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
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 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
Maximum hardness by delivery conditionTable VIII
Treated to improve shearability (TS), max
255 HB
Soft annealed (TA), max
235 HB
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)
1.5
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 letter H. End quench test at 850 ± 5 deg C (Table XIII).
Source: EN 10083-1:1991 (UNI EN 10083-1), Table V
Restricted hardenability (HH, HL), HRCTable VII
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 (UNI EN 10083-1), Table VII
Minimum hardness of strip as quenchedTable XI
Hardness, min
530 HV
Maximum strip thickness
2 mm
Applies to the quenching temperatures of Table XIII with oil cooling.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table XI
Heat treatmentTable XIII
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 (UNI EN 10083-1), Table XIII
Active EN 10083-1:1991 37Cr4 Listings on M-EX (For Sale)