EN 10083-1:1991 28Mn6 Steel: Specifications & Listings
EN 10083-1:1991 28Mn6: A manganese steel for quenching and tempering to EN 10083-1:1991 (printed 28 Mn 6). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 800 to 950 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
Cr+Mo+Ni
Mn
Mo
Ni
P
S
Si
0.25-0.32
<=0.40
<=0.63
1.30-1.65
<=0.10
<=0.40
<=0.035
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered, ruling section d <= 16 mm
Elongation
13% min
Hardness
Soft annealed: 223 HB max
Tensile Strength
800 to 950 MPa
Yield Strength
590 MPa min
More data from EN 10083-1:1991
From the standard
Other composition limitsTable III and its notes
Designation as printed
28 Mn 6
Improved machinability
Steels with lead or higher sulphur, up to about 0.100% S, may be supplied on request (Table III, note 3)
Restricted options
Without hardenability or quenched and tempered or normalized property requirements, a carbon range of 0.05 and/or Cr + Mo + Ni below 0.45 may be agreed (Table III, note 5)
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
590
800 to 950
13
40
35
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
450
700 to 850
15
45
40
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
440
650 to 800
16
50
40
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
Mechanical properties, normalized3 sizes
Size
Yield strength Re, min (MPa)
Tensile strength Rm, min (MPa)
Elongation A, min (%)
d <= 16 mm, t <= 16 mm
345
630
17
16 mm < d <= 100 mm, 16 mm < t <= 100 mm
310
600
18
100 mm < d <= 250 mm, 100 mm < t <= 250 mm
290
590
18
Values also apply to the grades with hardenability requirements (H, HH, HL). Sizes not listed are not covered by the standard.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table X
Maximum hardness by delivery conditionTable VIII
Treated to improve shearability (TS), max
255 HB
Soft annealed (TA), max
223 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
54
53
51
48
44
41
38
35
31
29
27
26
25
25
24
Minimum, HRC
45
42
37
27
21
Applies when ordered with the letter H. End quench test at 850 ± 5 deg C (Table XIII). Provisional values (Table V, note 1).
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.
54
53
51
48
44
41
38
35
31
29
27
26
25
25
24
HH min.
48
46
42
34
30
27
24
21
-
-
-
-
-
-
-
HL max.
51
49
46
41
35
32
29
26
22
20
-
-
-
-
-
HL min.
45
42
37
27
21
-
-
-
-
-
-
-
-
-
-
Restricted scatter bands by distance from the quenched end.
Source: EN 10083-1:1991 (UNI EN 10083-1), Table VII
Heat treatmentTable XIII
Quenching
830 to 870 deg C
Quenching agent
Water or oil
Tempering
540 to 680 deg C
End quench test
850 ± 5 deg C
Normalizing
850 to 890 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 28Mn6 Listings on M-EX (For Sale)