Changzhou Joyruns Steel Tube CO.,LTD
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EN10305-4 High-Pressure Fuel Injection Tube
Delivery condition and heat treatment processing of precision tubes for the automotive industry
| Delivery Condition | Heat treatment process |
| +N | Normalized. After the last cold drawing process, the tubes are annealed in a controlled atmosphere-bright annealing furnace(Non-oxygen heat treatment). |
Synopsis of Process Routing: Quality Carbon steel — Cold Drawn — Heat Treatment Without Oxidization (NBK Status) — Non-destructive Testing— Flushing The Internal Hole With Special Equipment Under High Pressure —Dealing With Antirust Oil On Surface — Plastic Capping On Both Ends.
The raw material we chose: high-quality Bao Steel, XingCheng Steel and HuaiSteel.Physical and chemical inspections will be made to make sure each batch is in the qualified range. After piecing, each piece of tube is checked to be in permitted size deviation, this can guarantee higher thickness tolerance and concentricity.
Production process quality control: We use the domestic first-class drawing machine, the production process is controlled with high hardness alloy internal and external matrix, so the product dimensions tolerance and ovality are strictly controlled in a high level.Through the first, middle and last process inspection to ensure product quality.
Inner and Outer Surface Cleaning: We adopt an automatic inner surface cleaning machine, rotating brush cleaning and high-pressure oil flushing to clean the inner and outer surface. The new steel tube production craftsmanship can effectively remove all particulate attached to the inner and outer surface of tubes and thus achieving the utmost surface cleanness and Polishness.
Finished tube anti-rust oil plating: We adopt high-pressure spray plating method, the antirust oil is plated by high-pressure jet after ten passes of filtering and one pass of precipitation to safeguard the tubes’ outer and inner surface cleanness and Polishness.
EN10305 Chemical composition
| Steel Grade | Chemical Composition | |||||
| Symbol | Material Number | C Max. | Si Max. | Mn Max. | P Max. | S Max. |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 |
| E255 | 1.0408 | 0.21 | 0.35 | 0.40--1.10 | 0.025 | 0.025 |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 |
| Steel Grade | +C | +LC | +SR | |||||
| Name | No. | Rm Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 |
| E255 | 1.0408 | 580 | 5 | 520 | 8 | 520 | 375 | 12 |
| E355 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 | 10 |
| Steel Grade | +A | +N | ||||
| Name | No. | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % |
| E235 | 1.0308 | 315 | 25 | 340--480 | 235 | 25 |
| E255 | 1.0408 | 390 | 21 | 440--570 | 255 | 21 |
| E355 | 1.0580 | 450 | 22 | 490--630 | 355 | 22 |
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
