EN 10083-3:2006 27MnCrB5-2 Steel: Specifications & Listings
EN 10083-3:2006 27MnCrB5-2: A manganese chromium boron alloy steel for quenching and tempering to EN 10083-3:2006 (steel number 1.7182). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 1000 to 1250 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 (%)
B
C
Cr
Mn
P
S
Si
0.0008-0.0050
0.24-0.30
0.30-0.60
1.10-1.40
<=0.025
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
14% min
Tensile Strength
1000 to 1250 MPa
Yield Strength
800 MPa min
More data from EN 10083-3:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.7182
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)
Boron
Added for its effect on hardenability (Table 3, footnote a)
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)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
800
1000 to 1250
14
55
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
750
900 to 1150
14
55
60
40 mm < d <= 60 mm, 20 mm < t <= 40 mm
700
800 to 1000
15
55
65
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.
Source: EN 10083-3:2006, Table 8
Maximum hardness by delivery conditionTable 7
Treated to improve shearability (+S), max
Shearable in the untreated condition
Soft annealed (+A), max
Not applicable to boron steels
Values also apply to the grades with hardenability requirements (+H, +HH, +HL); not applicable to continuously cast slabs not further deformed.
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
53
52
51
47
44
40
37
Minimum, HRC
47
46
45
44
43
41
39
36
30
24
20
Applies when ordered with the symbol +H. End quench test to EN ISO 642, quenching from 900 ± 5 deg C (Table 11).
Source: EN 10083-3:2006, Table 5
Maximum diameter for core hardness (reference values)Annex C
Hardening temperature
900 deg C
Core hardness
38 HRC
Approximate maximum diameter, water
52 mm
Approximate maximum diameter, oil
43 mm
Informative reference values for 80% martensite.
Source: EN 10083-3:2006, Annex C, Table C.1
Heat treatmentTable 11
Quenching
880 to 920 deg C
Quenching agent
Water or oil
Tempering
400 to 600 deg C
End quench test
900 ± 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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