EN 10083-3:2006 38MnB5 Steel: Specifications & Listings
EN 10083-3:2006 38MnB5: A manganese boron alloy steel for quenching and tempering to EN 10083-3:2006 (steel number 1.5532). Supplied as semi-finished products, bars, rod, wide flats, hot rolled strip, sheet and plate, and forgings. Quenched and tempered tensile strength 1050 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
Mn
P
S
Si
0.0008-0.0050
0.36-0.42
1.15-1.45
<=0.025
<=0.035
<=0.40
Mechanical Properties
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Elongation
12% min
Tensile Strength
1050 to 1250 MPa
Yield Strength
900 MPa min
More data from EN 10083-3:2006
From the standard
Other composition limitsTable 3 and its notes
Steel number
1.5532
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
900
1050 to 1250
12
50
-
16 mm < d <= 40 mm, 8 mm < t <= 20 mm
700
850 to 1050
12
50
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
60
60
59
58
57
57
55
53
48
41
37
33
31
Minimum, HRC
52
51
50
49
47
44
41
35
28
24
20
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
Maximum diameter for core hardness (reference values)Annex C
Hardening temperature
850 deg C
Core hardness
45 HRC
Approximate maximum diameter, water
40 mm
Approximate maximum diameter, oil
32 mm
Informative reference values for 80% martensite.
Source: EN 10083-3:2006, Annex C, Table C.1
Heat treatmentTable 11
Quenching
840 to 880 deg C
Quenching agent
Water or oil
Tempering
400 to 600 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
Active EN 10083-3:2006 38MnB5 Listings on M-EX (For Sale)