Precision Seamless Steel Pipe Cold Drawn Carbon Steel Tube EN10305-1 E355
TORICH is a 20 years experience steel manufacturer of EN 10305-1 seamless precision steel tube with delivery condition like BKS,GBK,NBK,BK.
1. Brief introduction of precision seamless steel pipe:
Length:
Random length: with a minimum of 3m. The length difference between the tubes shall not exceed 2 m per order item.
Approximate length: specified length with a length tolerance of ±500mm. Up to 10% of the quantity ordered may be supplied in short length≥2m. Short length shall be bundled seperately.
Manufacturing:
The precision seamless steel pipes shall be manufactured from hot finished seamless hollows by cold drawing.
Apperance:
The precision seamless steel pipe tube shall have smooth outer and inner surfaces.
Roughness:
For high precision steel pipe of OD: D≤260mm
----≤4um on the outer surface of tubes in the delivery conditions +SR,+A and +N;
----≤4um on the outer and inner surface of tubes in the delivery conditions +C and +LC, where the requirement for the inner surface applies for specified or calculated inside diameters ≥15mm.
For tubes of OD＞260mm: ≤4um on the outer and inner surface.
2.Delivery condition:
| 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). |
| 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. Seamless precision steel tube show:
4.Packing methods:
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.
5.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
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