Fuel Injection High Pressure Oil Hydraulic Cylinder Seamless Thick Steel Tube

Fuel Injection High Pressure Oil Hydraulic Cylinder Seamless Steel Tube

China Precision Steel Tube leading supplier, choose the high quality Hydraulic Precision Steel Tube, Precision Carbon Steel Tube, Precision Seamless Steel Tube, CDS Steel Tube, CDW Steel Tube

Wall thickness       4-30mm

Diameter        1-12.5mm

Length    5-6m  Upon request

Application :Diesel(compression-ignition)engines

Produce method: shall be manufactured from unalloyed quality steel or an equivalent steel produced by a steel-making process that ensures a very homogeneous structure.

The final reduction of the tube shall be followed by treatment to achieve the specified mechanical properties. Please advise.

Characteristic:Precision,Smooth finish,Cleanliness,High mechanical properties.

Delivery condition: NBK/GBK.

Outside surface condition

0: No

1:Outside surface as processed, without any additional finish. Tubes annealed or normalized in a controlled atmosphere may be discoloured,but shall be free from loose scale.

2.Zinc electroplated with a coating layer thickness of 8μm minimum and an additional colourless chromating^a

3. Zinc electroplated with a coating layer thickness of 8μm minimum and an additional yellow chromating

4 ,5,6,7,8 Reserved for further application

9 As specified subject to agreement

A: Chromating as described in ISO2080 and ISO4520

Characteristic  :

Mechanical properties

Tolerance is

Inside diameter ,d

d≤4mm:±0.05mm for class2 (for diesel (compression-ignition)engines)

         ±0.025mm for class 1(for fuel injection pump testing)

d＞4mm:±0.10mm

Outside diameter,D

D＜8mm:±0.06mm

D≥8mm: ±0.10mm

For Class 1 and Class2 Please refer above explain.

The maximum value of the concentricity of the tube outside diameter relative to inside diameter shall be proportional to the wall thickness, as shown in Figure1.

Normative references: ISO404 Steel and steel products-General technical delivery requirements.

 ISO6507-1 Metallic materials-Vickers hardness test-Part1: Test method

 ISO6892-1 Metallic materials-Tensile testing-Part1:Method of test at room temperature

ISO12345 Diesel engines-Cleanliness assessment of fuel injection equipment

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.