GB/T3639 Structural and Machanical 10#, 20#, 45#, Seamless Precision Steel Tube
Brand Name:Torich
Certification:ISO
Model Number:GB/T 3639
Minimum Order Quantity:2 tons
Delivery Time:25-45 days
Payment Terms:L/C, D/A, D/P, T/T, Western Union, MoneyGram
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Location:
Ningbo Zhejiang China
Address:
Suite 1004, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
Supplier`s last login times:
within 42 hours
Product Details
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Product Details
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:
RAW MATERIAL
↓
INCOMING INSPECTION
↓
STORAGE → CUTTING→HAMMERING → PICKING LUBRICATION → CLEANING →
PHOSPHORI CLEAN
↓
ENDS CUTTING←STRAIGHTENING←HEAT TREATMENT↔MIDDLLE CHECK↔ COLD
DRAWING ← LUBRICATING
↓
FINAL INSPECTION→BUNDING→STORAGE
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 |
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
Production of Precision Steel Tube:
Packing and delivery
Our Certifications
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, 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.
GB/T3639 Structural and Machanical 10#, 20#, 45#, Seamless Precision Steel Tube
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