| DIN 2391 |
| Standard Range |
Technical Properties |
| In Diameters |
30mm to 800mm |
Wall Thickness |
3mm - 50mm |
Length |
3m to 12m |
Tolerance |
ISO H 8 |
Straightness |
1/1000mm |
Surface Roughness |
Ra 0.20 - 0.40 Micron |
Packing |
Oiled and capped |
| Grade |
Mfg. Process |
Chemical composition |
Material No |
JIS |
| C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
Others |
a |
| St30Si |
S |
0.10Max |
0.30Max |
÷0.55 |
0.040Max |
0.040Max |
- |
- |
- |
- |
a |
1.0211 |
(STKM11) |
| St30A1 |
S |
0.10Max |
0.05Max |
÷0.55 |
0.040Max |
0.040Max |
- |
- |
- |
Al deoxydized |
a |
1.0212 |
(STKM11) |
| St35 |
S |
0.17Max |
0.35Max |
∶0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
1.0308 |
(STC38) |
| St45 |
S |
0.21Max |
0.35Max |
∶0.40 |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
1.0408 |
(STKM13) |
| St52 |
S |
0.22Max |
0.55Max |
∶1.60 |
0.050Max |
0.050Max |
- |
- |
- |
- |
a |
1.058 |
(STKM19) |
| Mechanical Properties: |
| Designation |
Cold drawn / hard |
Cold drawn / soft |
Cold drawn and stress relieved |
Annealed |
Normal |
| Symbol |
+c(BK) |
+LC(BKW) |
+SR(BKS) |
+A(GBK) |
+N(NBK) |
| Delivery Condition Description |
No heat treatment after the final cold drawing process |
After the final heat treatment there is a suitable drawing pass. |
After the final cold drawing process there is a stress relief heat t treatment in a controlled atmosphere |
After the final cold drawing process the tubes are annealed in a controlled atmosphere |
After the final cold drawing process the tubes are normalized in a controlled atmosphere |
| Delivery State |
BK |
BKW |
BKS |
GBK |
NBK |
| Grade |
Material NO. |
Tensile Strength |
Elongation |
Tensile Strength |
Elongation |
Tensile Strength |
Yield Strength |
Elongation |
Tensile Strength |
Elongation |
Tensile Strength |
Yield Strength |
Elongation |
| (N/mm2) |
% |
(N/mm2) |
% |
(N/mm2) |
(N/mm2) |
% |
(N/mm2) |
% |
(N/mm2) |
(N/mm2) |
% |
| Min. |
Min. |
Min. |
Min. |
Min. |
min. |
Min. |
Min. |
Min. |
Min. |
min. |
Min. |
| St 30 Si |
1.0211 |
430 |
8 |
380 |
12 |
380 |
280 |
15 |
280 |
30 |
290-420 |
215 |
30 |
| St 30 Al |
1.0212 |
430 |
8 |
380 |
12 |
380 |
280 |
15 |
280 |
30 |
290-420 |
215 |
30 |
| St 35 |
1.0305 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
340-470 |
235 |
25 |
| St 45 |
1.0408 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440-570 |
255 |
21 |
| St 52 |
1.058 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490-630 |
355 |
22
|
| |
EN 10305-1 |
| Gr. |
Steel number |
C max |
Si max |
Mn |
P max |
S max |
Al min |
|
E215
|
1.0212
|
0.10
|
0.05
|
0.70
|
0.025
|
0.025
|
0.025
|
|
E235
|
1.0308
|
0.17
|
0.35
|
1.20
|
0.025
|
0.025
|
-
|
|
E355
|
1.0580
|
0.22
|
0.55
|
1.60
|
0.025
|
0.025
|
-
|
| Steel grade |
Minimum values for the delivery condition |
| Steel name |
Steel number |
+ C |
+ LC |
+ SR |
+ A |
+ N |
| Rm Mpa |
A% |
Rm Mpa |
A% |
Rm Mpa |
ReH Mpa |
A% |
ReH Mpa |
A% |
Rm Mpa |
ReH Mpa |
A% |
|
E215
|
1.0212
|
430
|
8
|
380
|
12
|
380
|
280
|
16
|
280
|
30
|
290-430
|
215
|
30
|
|
E235
|
1.0308
|
480
|
6
|
420
|
10
|
420
|
350
|
16
|
315
|
25
|
340-480
|
235
|
25
|
|
E355
|
1.0580
|
640
|
4
|
580
|
7
|
580
|
450
|
10
|
450
|
22
|
490-630
|
355
|
22
|
|
DELIVERY CONDITION
|
| Designation |
Symbol |
Delivery Condition Description |
| Cold drawn / hard |
+c(BK) |
No heat treatment after the final cold drawing process |
| Cold drawn / soft |
+LC(BKW) |
After the final heat treatment there is a suitable drawing pass. |
| Cold drawn and stress relieved |
+SR(BKS) |
After the final cold drawing process there is a stress relief heat t treatment in a controlled atmosphere |
| Annealed |
+A(GBK) |
After the final cold drawing process the tubes are annealed in a controlled atmosphere |
| Normal |
+N(NBK) |
After the final cold drawing process the tubes are normalized in a controlled atmosphere |
|
Seamless cold-drawn precision steel pipes E235N (St 37.4) and E355N (St. 52.4) according to the EU’s EN 10305-4 standard
a) E235N (St 37.4) – NBK – Normalized, phosphated and oiled inside and outside
b) E235N (St 37.4) – NBK/ZN – Normalized, electric zinc plated with Cr-VI-free passivation
c) E355N (St 52.4) – NBK – Normalized, phosphated and oiled inside and outside
d) E355N (St 52.4) – NBK/ZN – Normalized, electric zinc plated with Cr-VI-free passivation
DIN 2391 Seamless precision steel pipes for Hydraulic system
ASTM A513 Seamless precision steel pipe
ASTM A519 Seamless precision steel pipe
EN10305-1 Seamless precision steel pipe for machinery use
EN10305-2 Welded precision steel pipe for oil cylinder tube
EN 10305-4 hydraulic bending precision seamless steel tubes
