Changzhou Joyruns Steel Tube CO.,LTD
High quality, Best service, Reasonable price.
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EN10305-1 E235/E255/E355 + NBK/N/BK Gas Spring Precision Seamless Steel Tube
| 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
