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)

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