Cold Rolled Q345 E255 ST52 High Precision Seamless Steel Tube for Automative Use
Cold Rolled Q345 E255 ST52 High Precision Seamless Steel Tube for Automative Use
Standard: GB/T 3639, DIN2391, EN10305
Technique: Cold Drawn, Cold Rolled.
Size range: OD: 4-76mm, WT:0.5-8mm, Length: ≤12m, or at buyer's request.
Material: 10#, 20#, 45#, Q345, ST35, ST45, ST55, ST52.4,E215 E235 E355, etc
Surface:
NBK, Galvanization/Galvanized/Zinc Coated, Blue White Zinc (Trivalent Chromium Passivation),
Plating Colour Zinc(Trivalent Chromium Passivation), Yellow, Army-Green, Phosphated/Black Phosphated
Surface quality:
Without oxidization, No crack, No fold, No rolling fold, No scar, No laminar defect
Main feature:
High precision, Excellent brightness, No oxidization on outer and inner walls after heat treatment
High cleanness of inside wall, High pressure, No deformation after clod bending, No crack after flaring and flattening
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
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects
Delivery Condition: BK(+C), BKW(+LC), BKS(+SR), GBK(+A),NBK( +N)
| BK (+C) Cold finished/hard | No heat treatment after the last cold forming process. |
| BKW (+LC) Cold finished/soft | After the 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 |
Product Display of Precison Steel Tube
Packing Details : In bundles or in wooden boxes packaging
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.
If you have another question, pls feel free to contact us.
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