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din 2391 st 35 steel pipe (din 2391, en 10305-1, en 10305-4, bs 6323 precision seamless steel tube NBK GBK)
(din 2391, en 10305-1, en 10305-4, bs 6323, SAE j524 525 529 precision seamless steel )




Production range: OD from 2mm to 70mm; wall thickness up to 10mm
Steel grades:
Standard Tubes | ||
Standards | TDR Standards | Steel Grades |
DIN | 1629 | ST 37 / 44 / 52 |
EN | 10305-1 | E215/235/355/255 |
GB | 3639 | 10#, 20#, 16Mn, 45# |
ASTM | A 519 | 1010 |
ASTM | A179-A450 | A450 |
ASTM | A822-A450 | A450 |
BS | BS 6323 | CFS3 |
NFA | 49310 | TU 37 b |
Delivery conditions:
Precision tubes are delivered in following conditions
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked).
After last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized.
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.
Tests: 100% eddy current test, chemical and mechanical inspection, size checking and others
Certificates: according to EN 10204 3.1
SURFACE TREATMENTS
1. Bare Tube (No coating): Bright and smooth
A. Silver galvanized
B. Yellow galvanized
C. Olive green coated
Layer thickness: 8-20um, Salty Spray Test: 48-150 hours
3. Black phosphate
APPLICATIONS
1. Automotive fields
A. Fuel injection lines/nozzles
B. CNG (Compressed Nature Gas) tube-- Burst pressure: 1307Bar, Working Pressure: around 350bar
C. Drive transmission: Steering column elements
D. Gear shafts, hand brake, front axles, airbag inflators, stabilizers, seat fasteners, front-wheel drive shafts
2. Hydraulic Fields
A. Hydraulic circuits (HPL), pneumatic lines, and hydraulic suspension
B. Hydraulic cylinders (HPZ)
SIZES AND TOLERANCE

| Mechanical properties at room temperature | |||||||||
| Delivery condition | BK | BKW | GBK | NBK | |||||
| steel Grade | Rm Mpa (Min) | A %(Min) | Rm Mpa(Min) | A %(Min) | Rm Mpa(Min) | A %(Min) | Rm Mpa(Min) | ReH Mpa(Min) | A %(Min) |
| St30Al or E215 | 430 | 8 | 380 | 12 | 280 | 30 | 290 to 430 | 215 | 30 |
| St35 or E235 | 480 | 6 | 420 | 10 | 315 | 25 | 340 to 480 | 235 | 25 |
| St45 or E255 | 580 | 5 | 520 | 8 | 390 | 21 | 440 to 570 | 255 | 21 |
| St52 or E355 | 640 | 4 | 580 | 7 | 450 | 22 | 490 to 630 | 355 | 22 |
Processing:

Inspection:

Packing and delivery:



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