E355+N Carbon Steel Seamless Hollow Bars Cold Drawn Precision Tube for Mechanical Applications

Material

E355+N is a non-alloy carbon steel seamless precision tube grade, steel number 1.0580, commonly used in the EN precision-tube and mechanical-tube system. In practical sourcing, it is generally treated under EN 10305-1 for seamless cold drawn precision tubes and can also align with EN 10297-1 for seamless tubes used in mechanical and general engineering. The “+N” delivery condition means normalized, giving the grade a strong balance of strength, toughness, and processing reliability for machined mechanical parts.

Specifications

• Product type: Cold drawn seamless precision tube / hollow bar
• Main grade: E355, 1.0580
• Delivery condition: +N (Normalized)
• Main EN route: EN 10305-1
• Related mechanical-tube route: EN 10297-1
• Manufacturing route: hot-finished seamless hollow, then cold drawn, then normalized
• Typical published EN 10305-1 E355 size range: outside diameter 4-380 mm; wall thickness 0.5-25 mm
• Length: custom fixed length or mill random length, subject to order
• Section: mainly round precision tube for machining and mechanical fabrication

These points match the published EN 10305-1 E355 product route and size range used by market references for seamless precision tubing.

Main Features

• Seamless construction for reliable structural integrity
• Cold drawn precision processing for better dimensional accuracy and surface quality
• Strong normalized-condition performance: tensile strength 490-630 MPa, yield strength at least 355 MPa, elongation at least 22%
• Suitable for machining-intensive applications requiring stable wall thickness, roundness, and assembly fit
• Well positioned for mechanical engineering, hydraulic-related, and general industrial uses

These characteristics come directly from the EN precision-tube scope and the published E355 +N mechanical-property window.

Our Advantages

1. Better dimensional control for machining efficiency
Buyers of precision seamless tube usually focus first on OD/ID accuracy, wall-thickness consistency, straightness, roundness, and concentricity. Market guidance on precision tubing repeatedly highlights those points as the dimensions that most affect assembly accuracy and downstream machining cost, so this product category is best positioned when dimensional control is treated as a core value rather than an afterthought.

2. Lower quality risk in defect-sensitive applications
A common buyer concern is whether the tube has surface cracks, folds, inclusions, or dimensional deviation after cold drawing. Industry defect references and quality-control guidance show that precision seamless tubes are judged heavily on surface condition, wall uniformity, flaw detection, and inspection discipline, which is why inspection-oriented sourcing matters for mechanical components and precision assemblies.

3. Easier project matching across global standards
International procurement often compares EN, ASTM, JIS, GOST, and GB routes during technical review. Positioning E355+N first as an EN precision seamless tube grade, then mapping it to comparable mechanical-tubing standards in other systems, makes drawing review and cross-border sourcing more efficient while avoiding careless one-to-one substitution.

Chemical Composition

Mechanical Properties

Execution Standards

• ASTM: ASTM A519 / A519M — seamless carbon and alloy steel mechanical tubing.
• EN: EN 10305-1 — seamless cold drawn tubes for precision applications; EN 10297-1 — seamless circular tubes for mechanical and general engineering purposes.
• GOST: GOST 8734-75 — cold-formed seamless steel tubes, commonly used together with GOST 8733 for technical requirements.
• JIS: JIS G 3445 — carbon steel tubes for machine structure.
• GB: GB/T 3639-2021 — seamless cold-drawn or cold-rolled steel tubes for precision applications.

Application Areas

General application sectors

• Mechanical engineering
• Hydraulic and pneumatic equipment
• Automotive components
• Industrial machinery
• Precision-machined tubular parts

These sectors are consistent with the stated scope of EN precision tubes, mechanical tubes, hydraulic/pneumatic precision tubes, and machine-structure tube standards.

Typical use within those sectors

• Mechanical engineering: sleeves, bush housings, spacers, machined tube blanks
• Hydraulic and pneumatic equipment: cylinder-tube blanks, honed-tube base material, precision line components
• Automotive: machined structural tube parts, suspension-related blanks, transmission-related tube components
• Industrial machinery: rollers, guides, bearing-seat blanks, conveyor and equipment members
• Precision machining: bored parts, turned hollow sections, close-tolerance component blanks

These part examples are engineering-use inferences based on the standards’ stated mechanical, precision, and hydraulic/pneumatic service scopes.

Procurement Note

For this title, I treated E355+N primarily as an EN 10305-1 seamless cold drawn precision tube grade, with EN 10297-1 as the related mechanical-tube reference. If a project drawing specifically requires true hollow-bar stock rather than precision tube, the order should still confirm the exact standard, tolerance class, and delivery condition before substitution.

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.