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[China]
Trade Verify
Address: Suite 1004, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Contact name:Richard SHEN
TORICH INTERNATIONAL LIMITED |
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Verified Suppliers
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Cold Drawn 17mm High Precision Steel Tube ST52 DIN2391 Tube Seamless Pipe
TORICH is a rich-experienced manufacturer of steel tube especially for precision DIN2391, EN103051, etc steel tube.
1.Brief introduction of cold drawn high precision steel tubes of DIN2391:
OD:16-325mm WT:1-22mm
Material:ST35, ST45,ST52, ST30 Si, ST30Al
Our testing:
dimensional check,
surface inspection,
tensile test
flattening test
drift expanding test
Length tolerance:
up to 500mm: +2mm/-0mm
above 500mm up to 2000mm: +3mm/-0mm
above 2000mm up to 5000mm: +5mm/-0mm
length above 5000 up to 7000mm: +10mm/0mm
Tube ends:
Cold darwn high precision steel tube shall be cut nominally square to the tube axis and shall be free from excessive burrs.
Quantity ordered in meters:
up to 500: +20% deviation
above 500 up to 2000: +15% deviation
above 2000: +10% deviation
2.Final supply conditions:
| BK (+C) Cold finished/hard (cold finished as drawn) | No heat treatment after the last cold forming process. |
| BKW (+LC) Cold finished/soft (lightly cold worked) | After the last heat treatment there is a light finishing pass (cold drawing).
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| 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. (Mainly focus on) | After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere |
3.Mechancial properties:
Steel grade
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BK |
BKS | GBK | NBK | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Tensile Strength Rm N/mm min | Elongation % min | Tensile Strength Rm N/mm min | Tensile Strength Rm N/mm min | Elongation % min | Tensile Strength Rm N/mm min | Elongation % min | Tensile strength Rm N/mm min
| Yield strength ReH N/mm min | Elongation % min | |
| St35 | 480 | 6 | 420 | 315 | 14 | 315 | 25 | 340-470 | 235 | 25 |
| St45 | 580 | 5 | 520 | 375 | 12 | 390 | 21 | 440-570 | 255 | 21 |
| St52 | 640 | 4 | 580 | 420 | 10 | 490 | 22 | 490-630 | 355 | 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.Cold drawn high precision steel tube product show:
5.Packing method of precision cold drawn steel tube:
FAQ
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, and it is according to
quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but you need to
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.
If you have another question, pls feel free to contact us
