EN 10083-1:1991 42CrMo4 Steel: Specifications & Listings
EN 10083-1:1991 42CrMo4: A chromium molybdenum alloy steel for quenching and tempering to EN 10083-1:1991 (printed 42 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
0.38-0.45
0.90-1.20
0.60-0.90
0.15-0.30
<=0.035
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
10% min
Hardness
Soft annealed: 241 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
42 CrMo 4
Pair grade
42CrMoS4 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 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
10
40
30
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
750
1000 to 1200
11
45
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
650
900 to 1100
12
50
35
100 mm < d <= 160 mm, 60 mm < t <= 100 mm
550
800 to 950
13
50
35
160 mm < d <= 250 mm, 100 mm < t <= 160 mm
500
750 to 900
14
55
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
241 HB
Values also apply to the grades with hardenability requirements (H, HH, HL); not applicable to continuously cast slabs not further deformed. Depending on the cast and the dimensions, particularly for HH grades, soft annealing may be necessary.
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
61
61
61
60
60
59
59
58
56
53
51
48
47
46
45
Minimum, HRC
53
53
52
51
49
43
40
37
34
32
31
30
30
29
29
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.
61
61
61
60
60
59
59
58
56
53
51
48
47
46
45
HH min.
56
56
55
54
52
48
46
44
41
39
38
36
36
35
34
HL max.
58
58
58
57
56
54
53
51
49
46
44
42
41
40
40
HL min.
53
53
52
51
49
43
40
37
34
32
31
30
30
29
29
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
560 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
820 to 860 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
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