Black Phosphate Precision Tube

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. bright black. Color is homogeneously distributed on the tube surface. The tube has good property of antirust.
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.

  • Grand's Advantages
  • Chemical Composition & Mechanical Properties
  • Inquiry

1.  Production of  DIN/EN10305 seamless high precision tubes since 2005.

2.  Working with customers from Europe,West Asia,North America,South America,etc since 2009.

3.  Samples can be delivered within 25 days after confirmation

4.  40 days as the production period and delivery after order confirmation.

5.  150,000 meters of seamless steel tubes in stock.

6.  200 sizes can be offered from OD:3mmxWT:0.5mm to OD:100mmxWT:10mm

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

8.  Professional team assists your special tube requirements.

9.  Other related tubes: bright annealed tubes,hydraulic steel tube;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 -
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 25

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