|
18NiCr5-4
EN 10084-1998, Number: 1.5810
|
|
Comparison of steel grades
|
|
JUS
|
-
|
|
DIN
|
-
|
|
BS
|
-
|
|
GOST
|
-
|
|
AISI
|
-
|
|
UNI
|
-
|
|
NF
|
20NC6
|
Chemical composition (cast analysis)
|
Chemical elements
|
C
|
Si
max
|
Mn
|
P
max.
|
S
|
Cr
|
Ni
|
-
|
|
%, by mass
|
0,16-0,21
|
0,40
|
0,60-0,90
|
0,035
|
≤ 0,035
|
0,90-1,20
|
1,20-1,50
|
|
|
Permissible deviation
|
± 0,02
|
+ 0,03
|
± 0,04
|
+ 0,005
|
+ 0,005
|
± 0,05
|
± 0,03
|
-
|
Hardness limits for
steel
|
Hardness HRC at a distance from
quenched end of test piece (in milimetres) of
|
|
mm
|
1,5
|
3
|
5
|
7
|
9
|
11
|
13
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
|
+H
|
max.
|
49
|
48
|
46
|
44
|
42
|
39
|
37
|
36
|
34
|
32
|
31
|
31
|
30
|
-
|
-
|
|
min.
|
41
|
39
|
35
|
32
|
29
|
27
|
25
|
24
|
21
|
20
|
-
|
-
|
-
|
-
|
-
|
|
+HH
|
max.
|
49
|
48
|
46
|
44
|
42
|
39
|
37
|
36
|
34
|
32
|
31
|
31
|
30
|
-
|
-
|
|
min.
|
44
|
42
|
39
|
36
|
33
|
31
|
29
|
28
|
25
|
24
|
23
|
23
|
22
|
-
|
-
|
|
+HL
|
max.
|
46
|
45
|
42
|
40
|
38
|
35
|
33
|
32
|
30
|
28
|
27
|
27
|
26
|
-
|
-
|
|
min.
|
41
|
39
|
35
|
32
|
29
|
27
|
25
|
24
|
21
|
20
|
-
|
-
|
-
|
-
|
-
|
Hardness requirements for products
delivered in the conditions ’’treated to improve shearabilita’’ (+S), ’’anneled
to maximum hardness requirements’’ (+A), ’’treated to hardness range’’ (+TH) or
’’treated to ferrite-pearlite structure and hardness range’’ (+FP)
|
Brinell hardness in the condition
|
|
+S max.
|
+A max.
|
+TH
|
+FP
|
|
min.
|
max.
|
min.
|
max.
|
|
255
|
223
|
170
|
223
|
156
|
207
|
|
|
|
|
|
|
|
Non-metallic
inclusions
Requirements for microscopic degree of purity when
tested in accordance with
DIN 50 602 (method K) (valid for oxidic non-metallic
inclusions)
|
D (mm)
Bars Diameter d (mm)
|
K
Total characteristic value K
(oxides) for the individual cast
|
|
140 < d 200
|
K 4 ≤ 50
|
|
100 < d ≤ 140
|
K 4 ≤ 45
|
|
70 < d ≤ 100
|
K 4 ≤ 40
|
|
35 < d ≤ 70
|
K 4 ≤ 35
|
|
17 < d ≤ 35
|
K 3 ≤ 40
|
|
8 < d ≤ 17
|
K 3 ≤ 30
|
|
d ≤ 8
|
K 2≤ 35
|
Conditions for heat treating test
bars and treatment of the steels
|
End quenchh test
Quenching, 0C
|
Carbunnzing temperature,
0C
|
Core-hardening
temperature, 0C
|
Case-hardening
temperature, 0C
|
Tempering, 0C
|
|
880
|
880 to 980
|
840 to 880
|
780 to 820
|
150 to 200
|
|
