GB/T3639 Structural and Machanical 10#, 20#, 45#, Seamless Precision Steel Tube

Basic Information
Place of Origin: China
Brand Name: Torich
Certification: ISO
Model Number: GB/T 3639
Minimum Order Quantity: 2 tons
Price: Negotiable
Packaging Details: Packed in wooden boxes or seaworthy packing.
Delivery Time: 25-45 days
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 500 Ton/Tons per Month
Detail Information
Product Name: GB/T3639 Structural And Machanical 10#, 20#, 45#, Seamless Precision Steel Tube Keyword: High Precision Seamless Steel Tube
Standard: GB/T 3639 Brand: TORICH
Grade: 10#, 20#, 45#, Q345, Etc. Surface Treatment: Customerized
Technical: Cold Drawn Cold Rolled Application: Structure Pipe,Hydraulic Pipe,Construction
High Light:

precision steel pipe


precision seamless pipe

Product Description

GB/T3639 Structural and Machanical 10#, 20#, 45#, Seamless Precision Steel Tube


Steel Grade/Steel Material:10#, 20#, 45#, etc
Steel pipe standard:GB/T 3639
Size:OD:10—110mm, WT:1.00—8.00mm, Length: 5.8m, 6m, 12m,or as required.

Technique: 1) Cold Rolled 2) Cold Drawn


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


Application: 1) shock absorber for motorcycle and automobile, 2) hydraulic gas cylinder

                      3) precision machine precision pipe part, 4) other auto pipe parts


Production Processs:






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



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


Production of Precision Steel Tube:
Precision Steel TubePrecision Steel Tube

GB/T3639 Structural and Machanical 10#, 20#, 45#,  Seamless Precision Steel Tube 2
Packing and delivery
Cold Drawn Precision Steel Tube Seamless 2 - 12m Length With GB/T3639 3


Our Certifications

DIN2391/ EN10305-1 Cold Drawn Galvanization High Precision Steel Tube NBK for Hydraulic System 4



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.


Contact Details
Claire ZHU

Phone Number : +8618957803066

WhatsApp : +8613736164628