Bright Annealed Steel Tube

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.

Main grades:

ST35,ST45,ST52,E215,E235,E355,etc

Delivery Status:

NBK(+N),Bright Annealed

Specifications:

Outer diameter x wall thickness
3~89 x 0.5~10mm

  • Baosheng's Advantages
  • Specifications
  • Inquiry

1.  12 years experience in production of  DIN/EN10305 seamless high precision tubes.

2.  10 years experience in working with customers from Europe,West Asia,South America,etc

3.  Samples can be delivered within 10 days after confirmation

4.  35 days as the production period and delivery after order confirmation.

5.  200,000 meters of bright annealed seamless steel tubes in stock.

6.  200 sizes can be offered from OD:3mmxWT:0.5mm to OD:89mmxWT:10mm

7.  Third party inspection like:TUV,BV,SGS,etc accepted

8.  Professional team assists your special tube requirements.

9.  Other related tubes:Double wall bundy steel tube,seamless welded stainless tubes,honed steel tubes;etc

Grade Chemical Composition(%):
C max Si max Mn P max S max
St 35 0.17 0.35 ≥0.40 0.025 0.025
St 45 0.21 0.35 ≥0.40 0.025 0.025
St 52 0.22 0.55 ≤1.60 0.025 0.025
Steel grade Chemical Composition(%):
Steel name 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 -

Mechanical Properties(Mpa):

Steel grade BK BKW BKS GBK NBK
RmN/mm
min
min RmN/mm
min
min N/mm
min
ReH
N/mm
min
min N/mm
min
min N/mm
min
ReH
N/mm
min
min
St35 480 6 420 10 420 315 14 315 25 340-470 235 25
St45 580 5 520 8 520 375 12 390 21 440-570 235 21
St52 640 4 580 7 580 420 10 490 22 490-630 355 22

 

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

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