E255 Cylinder Seamless Precision Steel Tube For Machine Structural
EN10305-1 E235/E255/E355 + NBK/N/BK Gas Spring Precision Seamless Steel Tube
Precision Cylinder Tubes, Honed Tubes
Seamless cold drawn precision tubes and pipes are widely used for machine structural purposes, automobile, and hydraulic pressure equipment.
Size: Outside Diameter: 6mm – 340mm, Wall Thickness: 1mm – 50mm
Standard: DIN2391, DIN2394, ASTM A519, JIS G3445 STKM
Application: used for Air Cylinder and Oil Cylinder, Oil Inlet Tubes and Gas Spring Tubes on Automobile, Bushing Tubes.
| 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
- Extremely limited wall thickness tolerances
- Reduced eccentricity
- Smooth drawn surface
- Increased strength values due to cold forming
- Tightly staggering range of dimensions
- Customized heat treatment
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