| C55R EN 10083-2:2002, Number: 1.1209 |
Comparison of steel grades |
|
|
JUS |
Č.1680 |
|
|
DIN |
(C55R, Cm55) |
|
|
BS |
(070M55) |
|
|
GOST |
55 |
|
|
AISI |
(1055) |
|
|
UNI |
- |
|
|
NF |
(XC55H1) |
|
C55R 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 |
0,52-0,60 |
0,40 |
0,60-0,90 |
0.025 |
0,035 |
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 |
- |
Jominy’s hardenability band
| Distance in mm from quenched end Hardness in HRC | |||||||||||||||||||
|
Symbol |
mm |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
13 |
15 |
20 |
25 |
30 |
||
|
+H |
max. |
65 |
64 |
63 |
62 |
60 |
57 |
52 |
45 |
37 |
36 |
35 |
34 |
33 |
32 |
30 |
29 |
||
|
min. |
58 |
55 |
47 |
37 |
33 |
32 |
31 |
30 |
29 |
28 |
27 |
26 |
25 |
24 |
22 |
20 |
|||
Tentative values for the ’’C’’ scale Rockwell hardness for special steel grades with restricted hardenability scatter bands (+HH and +Hl grades)
| Symbol |
Distance in mm from the quenched end HRC hardness |
||
|
1 |
4 |
5 |
|
|
+HH5 +HH15 +HL5 +HL15 |
- |
- |
42 to 60 |
|
60 to 65 |
- |
42 to 60 |
|
|
- |
- |
33 to 51 |
|
|
58 to 63 |
- |
33 to 51 |
|
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 |
C55R 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) |
- |
- |
- |
||
C55R 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) |
370 |
330 |
300 |
||
|
Rm min. (MPa) |
680 |
640 |
620 |
||
|
A min. (%) |
11 |
12 |
12 |
||
Hardness of surface hardened zones for special steels intended for flame and induction hardening
HRC min. 58
C55R Heat treatment conditions
| Quenching 0C |
Quenching agent |
Tempering temperature 0C |
Hardening temperature in the end quench test 0C |
Normalizing 0C |
|
805-840 |
Oil or water |
550-660 |
8300±5 |
825 to 885 |
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