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DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube

  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • Advanced High Strength Steel Tube (AHSS)
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
  • DIN 2391 St37.4(E235),St52.4(E355N),EN10305-1,BS 3062 Precision & Hydraulic Tube
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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Product Description
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

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

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
Product Image










Advanced High Strength Steel Tube (AHSS)
Advanced High Strength Steel Tube (AHSS)



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