EN 10083-1:1991 50CrMo4 Steel: Specifications & Listings
EN 10083-1:1991 50CrMo4: A chromium molybdenum alloy steel for quenching and tempering to EN 10083-1:1991 (printed 50 CrMo 4). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 1100 to 1300 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
Mo
P
S
Si
0.46-0.54
0.90-1.20
0.50-0.80
0.15-0.30
<=0.035
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
9% min
Hardness
Soft annealed: 248 HB max
Tensile Strength
1100 to 1300 MPa
Yield Strength
900 MPa min
More data from EN 10083-1:1991
From the standard
Other composition limitsTable III and its notes
Designation as printed
50 CrMo 4
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 tempered5 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
900
1100 to 1300
9
40
30
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
780
1000 to 1200
10
45
30
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
700
900 to 1100
12
50
30
100 mm < d <= 160 mm, 60 mm < t <= 100 mm
650
850 to 1000
13
50
30
160 mm < d <= 250 mm, 100 mm < t <= 160 mm
550
800 to 950
13
50
30
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. Impact values are provisional (Table IX, note 4).
Source: EN 10083-1:1991 (UNI EN 10083-1), Table IX
Maximum hardness by delivery conditionTable VIII
Treated to improve shearability (TS), max
Not specified
Soft annealed (TA), max
248 HB
Values also apply to the grades with hardenability requirements (H, HH, HL); not applicable to continuously cast slabs not further deformed. Where shearability is important, order this steel soft annealed.
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
65
65
64
64
63
63
63
62
61
60
58
57
55
54
54
Minimum, HRC
58
58
57
55
54
53
51
48
45
41
39
38
37
36
36
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.
65
65
64
64
63
63
63
62
61
60
58
57
55
54
54
HH min.
60
60
59
58
57
56
55
53
50
47
45
44
43
42
42
HL max.
63
63
62
61
60
60
59
57
56
54
52
51
49
48
48
HL min.
58
58
57
55
54
53
51
48
45
41
39
38
37
36
36
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
680 HV
Maximum strip thickness
3 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
820 to 860 deg C
Quenching agent
Oil
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
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