4130 CrMo Alloy Small Diameter seamless steel tube for Bicycle forks

4130 Alloy Chromoly Steel Pipe



Chemical Composition(%) Mechanical Property
C Si Mn S P Cr Ni Cu Mo Yield
Strength Tensile Strength
( σs ) ( σb )
0.28~0.33 0.15~0.30 0.40~0.60 ≤0.04 ≤0.035 ≤0.15
0.80~1.10 / 0.15~0.25 ≥785(80)
(MPa) ≥930(95)
(MPa)
End Shape Beveled end, plain end, vanished, or adding plastic caps to
protect the two ends as per customer's requirements
Surface Oiled, Galvanized, Phosphate etc
Treatment
Technique Cold drawn
Application 1. Automotive and mechanical pipes
2. Petroleum cracking pipes
3. High Pressure Boiler Pipe
4. Low and middle pressure fluid transportation pipeline
5. Chemical fertilizer equipment pipes
6. Heat exchanger pipes
Delivery 1. BK (+C) No heat treatment after last cold forming
process.
Conditions 2. BKW (+LC) After last heat treatment there is a light
finishing pass (cold drawing)
3. BKS (+SR) After the final cold forming process the tubes are
stress relieve annealed.
4. GBK (+A) After the final cold forming process the tubes are
annealed in a controlled atmosphere.
5. NBK (+N) After the final cold forming process the tubes are
annealed above the upper transformation point in acontrolled atmosphere.
Package 1. Bundle Packing.
2. Plain end or vanished as per customer's request.
3. Wrapped in waterproof paper.
4. Sackcloth with several steel strips.
5. Pack in heavy tri-wall boxes

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