|
|
28Mn6
EN
10083-2:2002, Number: 1.1170
|
|
Comparison of
steel grades
|
|
JUS
|
Č.3135
|
|
DIN
|
28Mn6
|
|
BS
|
(15M19)
|
|
GOST
|
30G2
|
|
AISI
|
(1330)
|
|
UNI
|
-
|
|
NF
|
(28Mn6, 20Mn5)
|
Chemical analysis -% by mass
|
Chemical
elements
|
C
|
Si
max.
|
Mn
|
P
max.
|
S1
max.
|
Cr
max.
|
Mo
max.
|
Ni
max.
|
Cr+Mo+Ni
max.
|
|
%
by mass
|
0,25-0,32
|
0,40
|
1,30-1,65
|
0.025
|
0,035
|
0,40
|
0,10
|
0,40
|
0,63
|
|
Permissible
deviation
|
±
0.02
|
+0,03
|
±
0,05
|
+
0.005
|
+
0.005
|
+0,05
|
+0,03
|
+0,05
|
-
|
1
For flat product, sulfur is restricted to max. 0,010% by mass.
Limiting values for the ’’C’’ scale Rockwell hardness for special steel
grade 28Mn6 with restricted hardenability scatter bands
|
Distance in mm
from quenched end HRC Hardness
|
|
Symbol
|
mm
|
1,5
|
3
|
5
|
7
|
9
|
11
|
13
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
-
|
|
+HH
|
max.
|
54
|
53
|
51
|
48
|
44
|
41
|
38
|
35
|
31
|
29
|
27
|
26
|
25
|
25
|
24
|
-
|
|
min.
|
48
|
46
|
42
|
34
|
30
|
27
|
24
|
21
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
+HL
|
max.
|
51
|
49
|
46
|
41
|
35
|
32
|
29
|
26
|
22
|
20
|
-
|
-
|
-
|
-
|
-
|
-
|
|
min.
|
45
|
42
|
37
|
27
|
21
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Maximum
hardness for products to be supplied in the ’’treated to improve shearability
(+S)’’ or
’’soft annealed
(+A)’’ condition
|
+S
HB max.
|
+A
HB max.
|
|
255
|
223
|
Mechanical
properties in the quenched and tempered condition (+QT)
|
|
Mechanical properties for the ruling sections (see prEN10083-1:2002,
Annex A) with a diameter (d) or for flat products trickness (t) of
|
|
d ≤ 16mm t ≤ 8mm
|
16mm < d ≤ 40mm
8mm < t ≤ 20mm
|
40mm < d ≤ 100mm
20mm < t ≤ 60mm
|
|
Re min (MPa)
|
590
|
490
|
440
|
|
Rm (MPa)
|
800-950
|
700-850
|
650-800
|
|
A min. (%)
|
13
|
15
|
16
|
|
Z min. (%)
|
40
|
45
|
50
|
|
KV min. (J)
|
35
|
40
|
40
|
|
|
|
|
|
|
|
Mechanical
properties in the normalized condition – (+N)
|
|
Mechanical properties for products with a diameter (d) or, for flat
products trickness (t) of
|
|
d ≤ 16mm t ≤ 16mm
|
16mm < d ≤ 100mm
16mm < t ≤ 100mm
|
100mm < d ≤ 250mm
100mm < t ≤ 250mm
|
|
Re min. (MPa)
|
345
|
310
|
290
|
|
Rm min. (MPa)
|
630
|
600
|
590
|
|
A min. (%)
|
17
|
18
|
18
|
|
|
|
|
|
|
|
Heat treatment
conditions
|
Quenching
0Cja )
|
Quenching
agent
|
Tempering
temperature 0C
|
Hardening
temperature in the end quench test 0C
|
Normalizing
0C
|
|
830-870
|
Water or oil
|
540-680
|
8500±5
|
850
to 890
|
|
28Mn6
EN 10250-2:1999, Number: 1.1170
|
|
Comparison of steel grades
|
|
JUS
|
Č.3135
|
|
DIN
|
28Mn6
|
|
BS
|
(15M19)
|
|
GOST
|
30G2
|
|
AISI
|
(1330)
|
|
UNI
|
-
|
|
NF
|
(28Mn6, 20Mn5)
|
Chemical analysis -% by mass *
|
Chemical elements
|
C
|
Si
max.
|
Mn
|
P
max.
|
S
max.
|
Cr
max.
|
Mo
max.
|
Ni
max.
|
Cr+Mo+Ni
max.
|
|
%, by mass
|
0,25-0,32
|
0,40
|
1,30-1,65
|
0.035
|
0,035
|
0,40
|
0,10
|
0,40
|
0,63
|
|
Permissible deviation
|
± 0.02
|
+0,03
|
± 0,06
|
+ 0.005
|
+ 0.005
|
+0,05
|
+0,03
|
+0,05
|
-
|
*At
the option of the manufacturer the elements aluminium, titanium, vanadium and
niobium may be added singly or in combination for grain size control
purposes. Elements not quoted in table shall not be added to the steel
without the agreement of the purchaser, except for the purpose of finishing
the heat.
Mechanical properties in the
normalized conditions
|
Thickness of ruling
section tR
|
|
Diameter in mm
|
tR ≤
100mm
|
100< tR
≤250mm
|
250< tR
≤500mm
|
500< tR
≤1000mm
|
|
Re min
(N/mm2)
|
310
|
290
|
270
|
260
|
|
Rm min
(N/mm2)
|
600
|
570
|
540
|
540
|
|
A % min.
|
l-longitudinal
|
18
|
18
|
18
|
17
|
|
tr - transverse
|
-
|
12
|
12
|
11
|
|
KV min * (J)
|
l-longitudinal
|
35
|
30
|
25
|
20
|
|
tr - transverse
|
-
|
20
|
15
|
15
|
1N/mm2=1MPa
Mechanical properties in the
quenched and tempered condition
|
Thickness of ruling
section tR
|
|
Diameter in mm
|
tR ≤
70mm
|
70< tR
≤160mm
|
1600< tR
≤330mm
|
|
Re min
(N/mm2)
|
440
|
390
|
340
|
|
Rm min
(N/mm2)
|
650
|
590
|
540
|
|
A % min.
|
l-longitudinal
|
16
|
18
|
19
|
|
tr - transverse
|
-
|
12
|
13
|
|
KV min * (J)
|
l-longitudinal
|
40
|
34
|
29
|
|
tr - transverse
|
-
|
21
|
17
|
1N/mm2=1MPa
Heat treatment conditions
|
Quenching
Temperature, 0C
|
Cooling medium
|
Tempering
Temperature, 0C
|
Normalizing
temperature, 0C
|
|
830 to 870
|
Water or oil
|
540 to 680
|
850 to 890
|
|
