Torich International Limited
We focus on Quality First, Quality Traceability, and Quality Stability! We focus on Customer First, People First, and Quality-Oriented!
Add to Cart
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 chromatinga
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
| Code | Tensile strength Rm N/mm2 Min | Proof strength Rp0.2 N/mm2 Min | Elongation A5 % | Hardness HV Max |
| 1 | 310 | 205 | 30 | 115 |
| 2 | 360 | 220 | 23 | 150 |
| 3 | 490 | 335 | 22 | 194 |
| 4 | 600 | 430 | 15 | 280 |
| Note: The mechanical properties apply when the tubes is tested in accordance with ISO6507-1 and ISo6892-1 | ||||
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
