Precision Carbon Steel Tube DIN 2391 Hydraulic System Automotive Industry
1.Brief introduction of precision carbon steel tubes:
Delivery condition:BK,NBK,BKS,GBK
Application:
Auto shock reducer inner cylinder,Oil cylinder tube,Motorcycle shock reducer steel tubes
Packing:oiled ,woven bags packing with two slings.
Feature:
–Precise outer diameter and inner diameter
–Tight tolerances, resulting in reduced machine time / Dimensional accuracy
–Smooth and Clean OD and ID surfaces
–Excellent machining characteristics
–Wider range of physical properties attainable through process and annealing options
2.Chemical composition:
| Steel grade | Chemical composition, as a percentage by mass |
| Symbol | Material number | C
max. | Si
max. | Mn | P
max. | S
max. |
| St 30 Si | 1.0211 | 0.10 | 0.30 | ≤0.55 | 0.025 | 0.025 |
| St 30 Al | 1.0212 | 0.10 | 0.05 | ≤0.55 | 0.025 | 0.025 |
| St 35 | 1.0308 | 0.17 | 0.35 | ≤0.40 | 0.025 | 0.025 |
| St 45 | 1.0408 | 0.21 | 0.35 | ≤0.40 | 0.025 | 0.025 |
| St 52 | 1.0580 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
3.Mechanical properties:
| 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 |
| St30 Si | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
| St30 Al | 400 | 8 | 330 | 12 | 280 | 30 | 290-420 | 30 |
| St 35 | 440 | 6 | 370 | 10 | 315 | 25 | 340-470 | 25 |
| St 45 | 540 | 5 | 470 | 8 | 390 | 21 | 440-570 | 21 |
| St 52 | 590 | 4 | 540 | 7 | 490 | 22 | 490-630 | 22 |
QUALITY CONTROL:
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing and Cold Rolling, on line inspection
5. Heat Treatment, +A, +SRA, +LC, +N, Q+T
6. Straightening-Cutting to specified length-Finished Measuring Inspection
7. Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8. Packing and Stocking
4.Precision carbon steel tube black phosphating product show:
5.Packing methods:
6.Q&A
Q: Are you trading company or manufacturer ?
A: A professional steel pipes materials inventor, manufacturer and solution provider
Q: How long is your delivery time?
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples of carbon seamless steel tube ? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
Q:Do you have agent or distributor in our country?
A:We are recruiting area agent and distributor all over the world, welcome to send us your mail or call us for detail discussion.
Q:How is your production capability?
A:1.2000 tons monthly production capacity, 5000 tons monthly trading capability
2.Prompt and Timely shipment
Q:How to get the sample?
A:1.You are requested to pay for sample charges and courier charges from China to your country; and the free sample is according the product like size, steel grade and quantity, please consult our sales for details
2.Sample charges will be refunded when order is placed.
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