E235N Carbon Steel Precision Hydraulic Seamless Cold Drawn Tube for Automotive with Ra ≤ 4 μm Surface Roughness
Product Details
E235N Carbon Steel Precision Steel Tube
,Automotive Application Hydraulic Seamless Tube
,Ra ≤ 4 μm Surface Roughness Cold Drawn Tube
E235N Carbon Steel Precision Tube Hydraulic Seamless Cold Drawn Tube for Automotive
Material
For technical data, this product title is best matched to EN 10305-4 grade E235 in delivery condition +N. It is a seamless cold-drawn precision carbon steel tube for hydraulic and pneumatic power systems, with precisely defined tolerances and specified surface roughness. The EN 10305 tube family is also widely used in vehicle and general engineering applications.
Specification
Manufacturing route: seamless, cold drawn, normalized (+N). Ordering is preferably by outside diameter × wall thickness, though OD × ID or ID × wall thickness can also be specified. EN 10305-4 lists preferred precision sizes in its standard table and allows non-listed dimensions by agreement; the standard length is 6 m +50/-0 mm, or exact 6 m +10/-0 mm unless otherwise agreed. Standard surface roughness is Ra ≤ 4 μm, with Ra ≤ 2 μm available for the inner surface as an option. For tubes with OD above 15 mm and lengths above 1000 mm, straightness is limited to 0.0015L and 3 mm per metre.
Main Features
Seamless construction reduces weld-line risk in pressure-sensitive assemblies. The +N normalized delivery condition gives E235 a balanced combination of strength and ductility, while EN 10305-4 adds dimensional inspection, visual examination, tensile testing, and NDT for leak-tightness verification on each individual tube. These characteristics make the grade well suited to hydraulic lines, pneumatic circuits, and precision automotive components.
Our Advantages
1. Stable dimensional accuracy for assembly-critical parts. Buyers often worry about flaring, bending, sealing, and fit-up consistency. EN 10305-4 is built around precision tolerances, and the standard roughness requirement of Ra ≤ 4 μm helps support cleaner inner surfaces and more predictable assembly performance.
2. Reliable pressure-line quality control. Buyers also want to avoid hidden defects and leakage risk. EN 10305-4 requires tensile testing, drift expanding testing, dimensional inspection, visual examination, and NDT leak-tightness verification, with leak-tightness checked on each individual tube.
3. Export-friendly traceability and inspection documents. International purchasers frequently ask for mill certification and lot traceability. Under EN 10305-4, products are ordered with EN 10204 inspection documents, and if the order does not specify the type, an inspection certificate 3.1 is issued; the documentation covers chemistry, tensile results, dimensional properties, appearance, and leak-tightness.
Chemical Composition
| Grade | Standard Reference | Steel No. | C | Si | Mn | P | S | Al / Other |
|---|---|---|---|---|---|---|---|---|
| E215 | EN 10305-4 | 1.0212 | ≤0.10 | ≤0.05 | ≤0.70 | ≤0.025 | ≤0.015 | Al ≥0.025 |
| E235 | EN 10305-4 | 1.0308 | ≤0.17 | ≤0.35 | ≤1.20 | ≤0.025 | ≤0.015 | Al ≥0.015 |
| E355 | EN 10305-4 | 1.0580 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.015 | Al ≥0.020 |
| E255 | EN 10305-1 Annex A | 1.0408 | ≤0.21 | ≤0.35 | 0.40-1.10 | 0.025 | ≤0.025 | — |
| E410 | EN 10305-1 Annex A | 1.0509 | 0.16-0.22 | 0.10-0.50 | 1.30-1.70 | 0.030 | ≤0.035 | V 0.08-0.15; Al 0.010-0.060; Nb ≤0.07; Ti ≤0.05 |
Mechanical Properties
| Grade | Standard Reference | Steel No. | Tensile Strength Rm (MPa) | Yield Strength ReH (MPa) | Elongation A (%) |
|---|---|---|---|---|---|
| E215 | EN 10305-4 | 1.0212 | 290-430 | ≥215 | ≥30 |
| E235 | EN 10305-4 | 1.0308 | 340-480 | ≥235 | ≥25 |
| E355 | EN 10305-4 | 1.0580 | 490-630 | ≥355 | ≥22 |
| E255 | EN 10305-1 Annex A | 1.0408 | 440-570 | ≥255 | ≥21 |
| E410 | EN 10305-1 Annex A | 1.0509 | 550-700 | ≥410 | ≥22 |
Execution Standards
| Standard | Short Description |
|---|---|
| EN 10305-4 | Exact match for seamless cold-drawn tubes for hydraulic and pneumatic power systems. |
| ASTM A519/A519M | Comparable North American reference for seamless carbon and alloy steel mechanical tubing, including cold-finished tubing. |
| GOST 9567-75 | Comparable CIS-region reference for precision steel tubes. |
| JIS G 3445 | Japanese reference for carbon steel tubes used for machinery, automobiles, bicycles, furniture, appliances, and other machine parts. |
| GB/T 3639-2021 | Chinese reference for seamless cold-drawn or cold-rolled precision tubes for mechanical structures, hydraulic equipment, and automobile parts. |
Application Fields
Broadly, this tube is used in automotive systems, hydraulic and pneumatic power systems, and general precision engineering. In practical use, that typically means automotive hydraulic lines, steering and safety-system tubing, shock absorber and cylinder components, hydraulic cylinder and control lines, pneumatic actuator tubing, and formed precision machine parts.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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