EN 10083-3:2006 30NiCrMo16-6 Steel: Specifications & Listings
EN 10083-3:2006 30NiCrMo16-6: A nickel chromium molybdenum alloy steel for quenching and tempering to EN 10083-3:2006 (steel number 1.6747). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 1080 to 1230 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
Ni
P
S
Si
0.26-0.33
1.20-1.50
0.50-0.80
0.30-0.60
3.3-4.3
<=0.025
<=0.025
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
10% min
Hardness
Soft annealed (+A): 270 HBW max
Tensile Strength
1080 to 1230 MPa
Yield Strength
880 MPa min
More data from EN 10083-3:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.6747
Steel class
Alloy special steel (clause 4.1)
Deoxidation
Killed
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)
Elements not quoted in Table 3 are not intentionally added without the purchaser's agreement, other than for finishing the heat. With hardenability or quenched and tempered property requirements, slight deviations within Table 4 are permitted except for carbon, phosphorus and sulphur.
Source: EN 10083-3:2006, Table 3 and its notes
Mechanical properties, quenched and tempered (+QT)5 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
880
1080 to 1230
10
45
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
880
1080 to 1230
10
45
35
40 mm < d <= 100 mm, 20 mm < t <= 60 mm
880
1080 to 1230
10
45
35
100 mm < d <= 160 mm, 60 mm < t <= 100 mm
790
900 to 1050
11
50
35
160 mm < d <= 250 mm, 100 mm < t <= 160 mm
880
900 to 1050
11
50
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 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. Sizes not listed are not covered by the standard. The standard prints Re min 880 MPa for 160 mm < d <= 250 mm, higher than the 790 MPa of the 100 to 160 mm size with the same tensile range; shown as printed.
Source: EN 10083-3:2006, Table 8
Maximum hardness by delivery conditionTable 7
Treated to improve shearability (+S), max
Not specified
Soft annealed (+A), max
270 HBW
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 10083-3:2006, Table 7
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
55
55
55
54
54
54
54
54
53
53
53
53
53
53
53
Minimum, HRC
47
47
47
46
46
46
46
46
45
45
45
45
45
45
45
Applies when ordered with the symbol +H. End quench test to EN ISO 642, quenching from 850 ± 5 deg C (Table 11).
Source: EN 10083-3:2006, Table 5
Restricted hardenability (+HH, +HL), HRCTable 6
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.
55
55
55
54
54
54
54
54
53
53
53
53
53
53
53
+HH min.
50
50
50
49
49
49
49
49
48
48
48
48
48
48
48
+HL max.
52
52
52
51
51
51
51
51
50
50
50
50
50
50
50
+HL min.
47
47
47
46
46
46
46
46
45
45
45
45
45
45
45
Restricted scatter bands by distance from the quenched end.
Source: EN 10083-3:2006, Table 6
Heat treatmentTable 11
Quenching
840 to 860 deg C
Quenching agent
Oil
Tempering
540 to 630 deg C
End quench test
850 ± 5 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).
Source: EN 10083-3:2006, Table 11
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