Requirements for seamless cold-drawn single-wall tubes using in diesel engines

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.

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