4130  CrMo Alloy Small Diameter seamless steel tube for Bicycle forks

4130 CrMo Alloy Small Diameter seamless steel tube for Bicycle forks

Product Details:

Place of Origin: CHANGZHOU, CHINA
Brand Name: Joyruns
Certification: ISO9000
Model Number: EN10305-1, DIN2391

Payment & Shipping Terms:

Minimum Order Quantity: 5TONs
Price: Negotiable
Packaging Details: Exporting package/wooden box package
Delivery Time: 30DAYS
Payment Terms: TT OT 100% LC AT SIGHT
Supply Ability: 1000Ton/month
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Detail Information

Standard: EN10305-1, DIN2391 Grade: E235, E255, E355
Type: Seamless Cold Drawing Or Cold Rolled OD. Range: 3mm – 30mm
Thickness: 0.5mm--12 Length: Max Length 6m

Product Description

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


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 or Cold Rolling, Online inspection
5. Heat Treatment:+SR, +A, +N
6. Straightening/Cutting to specified length/Finished Measuring Inspection
7. Quality Testing in own lab with Tensile Strength, Yield Strength, Elongation, Hardness, Straightness, etc.
8. Packing and Stocking.

100% Eddy Current Testing.
100% Size Tolerance Checking.
100% Tube surface checking to avoid surface defects.

Customer benefits

  • High dimensional accuracy for inside and outside diameters

  • Extremely limited wall thickness tolerances
  • Reduced eccentricity
  • Smooth drawn surface
  • Increased strength values due to cold forming
  • Tightly staggering range of dimensions
  • Customized heat treatment

 

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