EN 10083-3:2006 20MnB5 Steel: Specifications & Listings
EN 10083-3:2006 20MnB5: A manganese boron alloy steel for quenching and tempering to EN 10083-3:2006 (steel number 1.5530). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 900 to 1050 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
Mn
P
S
Si
0.0008-0.0050
0.17-0.23
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
900 to 1050 MPa
Yield Strength
700 MPa min
More data from EN 10083-3:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.5530
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)2 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
700
900 to 1050
14
55
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
600
750 to 900
15
55
60
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
50
49
49
49
47
45
43
41
33
27
Minimum, HRC
42
41
40
37
30
22
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
34 HRC
Approximate maximum diameter, water
32 mm
Approximate maximum diameter, oil
25 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
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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