WUXI SYLAITH SPECIAL STEEL CO.,LTD
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DIN 2391 E235 E355 Galvanized Steel Tube for Automobile , Cold Drawing API Steel Tubing
The surface of galvanized steel tube can be divided into hot dip or electric galvanized layer of welded steel tube.
| Product Name | DIN 2391 E235 E355 Galvanized Steel Tube for Automobile , Cold Drawing API Steel Tubing |
| Standard | DIN 2391 / DIN1630 / EN 10305-4 / EN 10305-1/ STN 42 6711 /42 6712,ČSN 42 6711 /42 6712. |
| OD | 6mm – 350mm or as required |
| Thickness | 0.8mm - 30mm or as required |
| Length | Fixed(6m,9m,12,24m) or normal length(5-12m) |
The Main Steel grades for the zinc coated tubes
St 30 Si / St 30 Al / St 35 / St37.4 / St45 / St 52 / St52.4 / E235, E255,E355
| DIN 2391 / EN 10305-1/ EN 10305-4 | |
| Precision seamless tube and pipe with European&Germany standard | |
| Application: | for Atuo;for machinery use; Oil cylinder tube; Motorcycle shock reducer steel tubes; Auto shock reducer inner cylinder. |
| Size(mm): | O.D.:6mm-350mm ; W.T.:1-30mm; L:max 24000 |
Grade and Chemical Composition(%)
| Grade | Chemical Composition(%): | ||||
| C max | Si max | Mn | P max | S max | |
| St 52 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
| St 45 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 35 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 30 Si | 0.10 | 0.30 | <=0.55 | 0.025 | 0.025 |
| St 30 Al | 0.10 | 0.05 | <=0.55 | 0.025 | 0.025 |
Condition on delivery
| Steel Grade | BK | BKW | GBK | NBK | ||||
| Code No. | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min | Tensile Strength N/mm2 min | Elongation at rupture N/mm2 min |
| St 52 | 590 | 4 | 540 | 7 | 490 | 22 | 490-630 | 22 |
| St 45 | 540 | 5 | 470 | 8 | 390 | 21 | 440-570 | 21 |
| St 35 | 440 | 6 | 370 | 10 | 315 | 25 | 340-470 | 25 |
| St30 Si | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
| St30 Al | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
Final supply conditions
| Designation | Symbol | Description |
| Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
| Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
| Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Galvanized tube category and related standard
| Galvanized tube category and related standard | |||
| Galvanized tube category | Related Standard | Zinc coating thickness | Salt spray test |
| Gr3+ Galvanized tube with blue and white zinc | ASTM B633-07 | 5-25um | 24--72 hours without white rust;48--168 hours without red rust |
| Gr3+ Galvanized tube with color zinc | ASTM B633-07 | 5-25um | 48--96 hours without white rust;48--240 hours without red rust |
| Gr6+ Galvanized tube with color zinc | ASTM B633-98 | 5-25um | 24--96 hours without white rust;48--124 hours without red rust |
Applications
Zinc coated precision steel tubes (galvanized tubes) are destined for hydraulic and pneumatic pressure distribution (so called HPL tubes),
production of automobile components, utility vehicles as well as for production of machine products such as fittings and joints.
Cold drawn precision tubes are used as the semi-finished product and they are made from rolled seamless tubes.
Precision tubes HPL types are made from carbon and alloyed steel.
Application areas:
Automotive, military, railway industry, with high requirement of the tubes brightness, cleanness, antirust, and antisepsis.
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FAQ
Q1: ARE YOU FACTORY OR TRADER?
A1: Wuxi Sylaith Special Steel Co.,Ltd is a manufacturer of steel pipe and tube since 2010. We've gained our Export Right and become an integrated company of industry and trade in order to satisfy buyer's multi-request on different material and products.
Q2: WHICH MATERIAL/PRODUCTS YOU CAN PROVIDE?
A2: Seamless Stainless Steel Pipe / Tube, Seamless Carbon Stainless Steel Pipe /Tube,Galvanized Steel Tube witn any Shape and Welded pipes can also be available.
Q3: HOW TO GET A SAMPLE?
A3: FREE samples are available for your checking and testing. And to get free samples, you need to send us you detailed receiving address (including post code) and your DHL/FedEx/UPS account for collecting samples, courier cost will be paid in your side.
Q4: CAN YOU PRODUCE THE PRODUCTS ACCORDING TO MY OWN DRAWINGS?
A4: Yes, we can produce the products according to your drawings that will be most satisfy you.
Q5: HOW TO VISIT YOUR FACTORY?
A5: Most of the main cities have flights to Shanghai; you can take flight to Shanghai Putong/Hongqiao International Airport.
If you come from Hongkong, it will take 2 hours by flight (every day 5 flight around noon time)