| C55 EN 10250-2:1999, Number: 1.0535 |
Comparison of steel grades |
|
|
JUS |
Č.1630 |
|
|
DIN |
C55 |
|
|
BS |
070M55 |
|
|
GOST |
55 |
|
|
AISI |
1055 |
|
|
UNI |
C55 |
|
|
NF |
(AF70C55), IC55 |
|
C55 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 |
0,52-0,60 |
0,40 |
0,60-0,90 |
0,045 |
0,045 |
0,40 |
0,10 |
0,40 |
0,63 |
- |
|
Permissible deviation |
± 0,02 |
+ 0,03 |
± 0,04 |
+ 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 and normalized and tempered conditions
| Thickness of ruling section tR | |||||
|
Diameter in mm |
tR ≤ 100mm |
100< tR ≤250mm |
250< tR ≤500mm |
500< tR ≤1000mm |
|
|
Re min (N/mm2) |
330 |
330 |
260 |
250 |
|
|
Rm min (N/mm2) |
640 |
620 |
600 |
590 |
|
|
A % min. |
l-longitudinal |
12 |
12 |
12 |
11 |
|
tr -transverse |
- |
9 |
9 |
8 |
|
|
KV min * (J) |
l-longitudinal |
- |
- |
- |
- |
|
tr -transverse |
- |
- |
- |
- |
|
1N/mm2=1MPa Maksimim hardness for forgings to be supplied in the annealed condition
HB max 229
Heat treatment conditions
| Quenching Temperature, 0C |
Cooling medium |
Tempering Temperature, 0C |
Normalizing temperature, 0C |
|
805 to 845 |
Oil or water |
550 to 660 |
825 to 865 |
|
C55 EN 10083-2:2002, Number: 1.0535 |
Comparison of steel grades |
|
|
JUS |
Č.1630 |
|
|
DIN |
C55 |
|
|
BS |
070M55, (EN9) |
|
|
GOST |
55 |
|
|
AISI |
1055 |
|
|
UNI |
C55, 1C55 |
|
|
NF |
(AF70C55), 1C55 |
|
C55 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 |
0,52-0,60 |
0,40 |
0,60-0,90 |
0.045 |
0,045 |
0,40 |
0,10 |
0,40 |
0,63 |
|
Permisible deviation |
± 0.02 |
+ 0,03 |
± 0,04 |
+ 0.005 |
+ 0.005 |
+0,05 |
+0,03 |
+0,05 |
- |
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 |
229 |
C55 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) |
550 |
490 |
420 |
|
Rm (MPa) |
800-950 |
750-900 |
700-850 |
|
A min. (%) |
12 |
14 |
15 |
|
Z min. (%) |
30 |
35 |
40 |
|
KV min. (J) |
- |
- |
- |
Re:Upper yield strenght or, if on yield phenomenos occurs, the 0,2% proof strenght Rρ0,2. Rm: Tensile strenght Mechanical properties in the normalized condition – (+N)
|
Mechanical properties for products with a diameter (d) or, for flat products, a trickness (t) of |
|||
|
d ≤ 16mm t ≤ 16mm |
16mm < d ≤ 100mm 16mm < t ≤ 100mm |
100mm < d ≤ 250mm 100mm < t ≤ 250mm |
|
|
Re min. (MPa) |
370 |
300 |
300 |
|
Rm min. (MPa) |
680 |
640 |
620 |
|
A min. (%) |
11 |
12 |
12 |
Heat treatment conditions
| Quenching, 0C |
Quenching agent |
Tempering, 0C |
Normalizing, 0C |
|
805-845 |
Water or oil Oil or water |
550-660 |
825 to 885 |
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