EN 10083-2:2006 28Mn6 Steel: Specifications & Listings
EN 10083-2:2006 28Mn6: A manganese steel for quenching and tempering to EN 10083-2:2006 (steel number 1.1170, non alloy special steel). 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
<=0.030
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
13% min
Hardness
Soft annealed (+A): 223 HBW max
Tensile Strength
800 to 950 MPa
Yield Strength
590 MPa min
Typical Available Sizes
Round Bar
16mm–250mm dia
Flat Bar
20×8mm–150×40mm
Sizes are indicative. Contact seller for exact availability.
More data from EN 10083-2:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.1170
Steel class
Non alloy special steel (clause 4.1)
Deoxidation
Killed (clause 6.2)
Sulphur, flat products
May be restricted to max. 0.010 if agreed at enquiry and order (Table 3, footnote e)
Improved machinability
Sulphur up to about 0.10 may be supplied on request; the manganese upper limit may then rise by 0.15 (Table 3, footnote c)
Restricted options
Without hardenability or mechanical property requirements, a carbon range of 0.05 and/or Cr + Mo + Ni max. 0.45 may be agreed (Table 3, footnote d)
Elements not quoted in Table 3 are not intentionally added without the purchaser's agreement, other than for finishing the heat.
Source: EN 10083-2:2006, Table 3 and its notes
Mechanical properties, quenched and tempered (+QT)3 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
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
490
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 Charpy V-notch test pieces, average of 3 values, no single value below 70% of the minimum. Ruling sections as in EN 10083-1:2006, Annex A.
Source: EN 10083-2:2006, Table 9
Mechanical properties, normalized (+N)3 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
For plates over 10 mm and bars over 100 mm diameter a hardness test may be agreed instead of the tensile test, converted to tensile strength according to EN ISO 18265 (clause 7.1.4).
Source: EN 10083-2:2006, Table 10
Maximum hardness by delivery conditionTable 8
Treated to improve shearability (+S), max
255 HBW
Soft annealed (+A), max
223 HBW
Values also apply to the grades with hardenability requirements (+H, +HH, +HL); not applicable to continuously cast slabs not further deformed.
Source: EN 10083-2:2006, 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
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 symbol +H; otherwise for guidance only. End quench test to EN ISO 642, quenching from 850 ± 5 deg C (Table 13).
Source: EN 10083-2:2006, 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.
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 10083-2:2006, Table 7
Heat treatmentTable 13
Quenching
840 to 880 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 mandatory. Lower quenching temperatures generally for water, upper for oil; austenitizing at least 30 min, tempering at least 60 min (guide values).