| C60R EN 10083-2:2002, Number: 1.1223 |
Comparison of steel grades |
|
|
JUS |
Č.1780 |
|
|
DIN |
Cm60 |
|
|
BS |
- |
|
|
GOST |
- |
|
|
AISI |
- |
|
|
UNI |
||
|
NF |
- |
|
C60R Chemical analysis-% by mass
| Chemical elements |
C |
Si max. |
Mn |
P max. |
S |
Cr max. |
Mo max. |
Ni max. |
Cr+Mo+Ni max. |
|
%, by mass |
0,57-0,65 |
0,40 |
0,60-0,90 |
0.025 |
0,020-0,040 |
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. |
67 |
66 |
65 |
63 |
62 |
59 |
54 |
47 |
39 |
37 |
36 |
35 |
34 |
33 |
31 |
30 |
||
|
min. |
60 |
57 |
50 |
39 |
35 |
33 |
32 |
31 |
30 |
29 |
28 |
27 |
26 |
25 |
23 |
21 |
|||
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 ftom the quenched end HRC hardness |
||
|
1 |
4 |
5 |
|
|
+HH5 +HH15 +HL5 +HL15 |
- |
- |
44 to 62 |
|
62 to 67 |
- |
44 to 62 |
|
|
- |
- |
35 to 53 |
|
|
60 to 65 |
- |
35 to 53 |
|
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 |
241 |
C60R 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) |
580 |
520 |
450 |
||
|
Rm (MPa) |
850-1000 |
800-960 |
750-900 |
||
|
A min. (%) |
11 |
13 |
14 |
||
|
Z min. (%) |
25 |
30 |
35 |
||
|
KV min. (J) |
- |
- |
- |
||
C60R 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) |
380 |
340 |
310 |
|
Rm min. (MPa) |
710 |
670 |
650 |
|
A min. (%) |
10 |
11 |
18 |
C60R Heat treatment conditions
| Quenching 0C |
Quenching agent |
Tempering temperature 0C |
Hardening temperature in the end quench test 0C |
Normalizing 0C |
|
800-840 |
Oil or water (ulje ili voda) |
550-660 |
8300±5 |
820 to 880 |
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