Zinc Plated Hydraulic Seamless Tubing

1. Description of Zinc Plated Hydraulic Seamless Tubing

the steel billets is from Baosteel, Xingcheng Special Steel or Huaisteel, we do 100% visual inspection and chemical inspection randomly, then bars were cut into short pcs as per requirement of final tube length requirement to do hot piercing, the whole processing flow chart of seamless pipe as below:

2. Specification of Zinc Plated Hydraulic Seamless Tubing  

2.1 Dimensions

Tubes shall be ordered:

2.1.1. by outside diameter and inside diameter

2.1.2. by outside diameter and wall thickness

2.2 Tolerances

 2.3 Steel grades

 Steel is produced in electric arc furnace and is fully killed.  chemical composition as below

2.4 Delivery conditions and heat treatment

BK (+C) Cold finished/hard (cold finished as drawn). No heat treatment after the last cold forming process

BKW (+LC) Cold finished/soft (lightly cold worked). 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

2.5 Surface condition

Tubes are supplied coated with zinc, the zinc layer thickness>12 µm.

2.6 Tube ends

The tubes are delivered with plain ends without burrs. and ends are plugged with plastic caps

3.Testing of  Zinc Plated Hydraulic Seamless Tubing

• flattening test , flaring test, bending test

• mechanical properties test

• NDT for detection of transverse imperfections and wall imperfections

4. Packing   

Tubes are packed in round or hexagonal bundles with weight max.1000 kg. Other possibilities by agreement.

5. Mill Test Certificate

Types of inspection documents according to EN 10204 3.1.B

6. Estimate Working Pressure

Army Green galvanizing Seamless Tube St37.4 high quality tubing, cleaned, plugged, normalised, free of scale, zinc plated & oiled to Din 2391 Sheet 2 grade C.

Zinc Plated Hydraulic Seamless Tubing  

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