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DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
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| Model No.︰ | - |
| Brand Name︰ | DIN 2391,EN10305-4,AS1450 PRECISION SEAMLESS TUBE |
| Country of Origin︰ | - |
| Unit Price︰ | US $ 1300 / MT |
| Minimum Order︰ | 20 MT |
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| 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
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EN 10305-1 |
| Gr. |
Steel number |
C max |
Si max |
Mn |
P max |
S max |
Al min |
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E215
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1.0212
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0.10
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0.05
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0.70
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0.025
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0.025
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0.025
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E235
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1.0308
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0.17
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0.35
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1.20
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0.025
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0.025
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-
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E355
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1.0580
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0.22
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0.55
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1.60
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0.025
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0.025
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-
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| 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% |
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E215
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1.0212
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430
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8
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380
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12
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380
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280
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16
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280
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30
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290-430
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215
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30
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E235
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1.0308
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480
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6
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420
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10
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420
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350
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16
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315
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25
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340-480
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235
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25
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E355
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1.0580
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640
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4
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580
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7
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580
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450
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10
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450
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22
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490-630
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355
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22
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DELIVERY CONDITION
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| 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 |
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DIN 2391 Seamless precision steel pipes for Hydraulic system-ST 35, ST 45, ST 52 in BK and BK+S
DIN 2393 DOM steel tube for mechinery
ASTM A513 Seamless precision steel pipe
ASTM A519 Seamless precision steel pipe-1020, 1020,1045
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
JIS G3473 STC J70
GB8713-88 10#,20#,35#,45#
DIN 1630
DIN 2445
GOST 9567-75
GOST 8734-75
GOST 8733-74
Mechanical Tubing: EN 10305-3, BS 6323 Part 5, DIN 2394
Cold Drawn Welded Tubes: EN 10305-2, BS 6323 Part 6, DIN 2393
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| Standard Met︰ | Synopsis of Process Routing: quality carbon steel → cold drawing → bright heat treatment without oxidization (NBK status) → nondestructive testing. In the wall honing and inside flushing under the high pressure→. Antirust oiling outside surface→plastic capping on both ends
Main Features: high accuracy, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high cleanness inside wall. The steel tube is able to stand high pressure. No deformation after cold bending, no crack after flaring and flattening . The complicated geometrical forming and machining can be realized. Color of tube: gray with white.
Main Application: to be used in hydraulic system, automobile and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.
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
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Product Image
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Advanced High Strength Steel Tube (AHSS)
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