Steel grades:
| Standard Tubes | ||
| Standards | TDR Standards | Steel Grades |
| DIN | 1629 1630 2391-2 17204 17210 | ST 37 / 44 / 52 ST 37.4 / 44.4 / 52.4 ST 35 / 45 / 52 C22 – Ck 22 – Cm22 – C35 – Ck 35 – Cm 35 C45 - Ck 45 – Cm 45 – 34 CrMo4 C15 – Ck 15 – Cm 15 – 16MnCr5 |
| EN | 10305-4 | E215/235/355/255 26Mn 5 C35E C45E 20V1 (E410) 26Mo2 25CrMo4 42CrMo4 |
| GB | 3639 | 10#, 20#, 16Mn, 45# |
| ASTM | A 519 | 1010 1020 1035 |
| BS | BS 6323 | CFS3 CFS4 CFS5 CFS6 CFS7 |
| NFA | 49310 | TU 37 b TU 52 XC |
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.
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
Packing: Bundles or boxes
SURFACE TREATMENTS
1. Bare Tube (No coating): Bright and smooth, Surface Roughness both inner and outer surface 0.2Ra Maximum for special requirement
2. Surface Coating
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)
DIN1629 St37 NBK Cold Drawn Seamless Tube
DIN1629 St37 NBK Cold Drawn Seamless Tube
