High-Quality Seamless Carbon and Alloy Steel Tubes for Global Buyers

Product Description

Product Description

Precision Starts With the Ordered Specification

EN 10305-1 specifies technical delivery conditions for seamless cold-drawn steel tubes used in precision applications.

The page focuses on dimensional control and repeatable downstream processing. Grade, delivery condition, size, tolerance, surface requirement, inspection and documentation must be defined together on the order.

Product focus: seamless cold-finished tube supplied to applicable EN 10305-1 requirements. Specific combinations remain subject to technical review.

DIMENSIONS AND TOLERANCES

Control the Geometry That Matters to Your Part

≡ OD  Outside Diameter  :       Tube size and tolerance basis stated on the order.
≡ ID    Inside Diameter     :       Controlled directly or derived from OD and wall, as specified.

≡ WT  Wall Thickness      :       Nominal wall and allowable variation confirmed before production.

≡ O     Roundness             :       Reviewed for forming, machining and component fit.

≡ S     Straightness           :      Inspection method and requirement follow the application.

≡ Ra  Surface Quality       :      Surface and roughness requirement defined where needed.

Specification

IMPORTANT PARAMETERS
Product type	Seamless cold-drawn precision steel tube
Standard focus	EN 10305-1:2016, subject to order review
Common grade directions	E215 / E235 / E355, confirm grade availability before quotation
Outside diameter	15-70 mm
Wall thickness	1-14 mm
Length	Random, fixed or cut-to-length according to order
Delivery conditions	+C / +LC / +SR / +A / +N where applicable
Dimensional basis	OD x wall, OD x ID or ID x wall as agreed
Surface	Bare, oiled, phosphated or order-specific finish where available
Documentation	Material and inspection documentation as specified
Not every OD and wall combination is available in every grade, condition or tolerance class. Final feasibility is confirmed against the complete purchase specification.

Chemical composition
Steel grade		% by mass
Steel name	Steel number	C max.	Si max.	Mn max.	P max.	S max.	Altotalb min.
E215	1.0212	0,10	0,05	0,70	0,025	0,025	0,025
E235	1.0308	0,17	0,35	1,20	0,025	0,025	0,015
E355	1.0580	0,22	0,55	1,60	0,025	0,025	0,020
Mechanical properties at room temperature
Steel grade		Minimum values for the delivery condition
		+C	+LC	+SR	+A	+N
Steel name	Steel number	Rm     /   A Mpa    /  %	Rm    /    A Mpa   /   %	Rm   / Reh  /  A Mpa  /  Mpa /%	Rm    /    A Mpa   /   %	Rm   / Reh  /   A Mpa  /  Mpa /  %
E215	1.0212	430/8	380/12	380/280/16	280/30	290~430/215/30
E235	1.0308	480/6	420/10	420/350/16	315/25	340~480/235/25
E355	1.0580	640/4	580/7	580/450/10	450/22	490~630/355/22

Applications

Precision Tube for Automotive and Mechanical Components

≡ 01     Automotive Parts                                         Precision sleeves, supports and structural components

≡ 02     Shock Absorber Parts                                 Tube blanks and machined cylindrical components

≡ 03     Steering Components                                 Steering shafts, columns and related tube parts

≡ 04     Motorcycle Parts                                         Structural and precision-fabricated components

≡ 05     Bicycle Components                                  Tube-based frame and mechanical parts

≡ 06     Bushings and Sleeves                                Cut rings and machined tubular blanks

≡ 07     Machine Parts                                             Hollow shafts, spacers and precision components

≡ 08     Custom Fabrication                                    Drawing-based tubular and annular parts

From Precision Tube to Ready-to-Use Component

Precision Cutting and Chamfering:

Fixed and cut-to-length supply

CNC Machining  :

Turning , Milling and Drilling

Honing and Skived & Roller Burnished   :

Precision internal surface

Custom Machining:

Components according to drawings

INSPECTION AND TRACEABILITY

Inspection From Material Identity to Packed Tube

≡ Chemical composition                        ≡ Tensile and yield

≡ Elongation                                             ≡  Hardness where required

≡ OD / ID / wall                                        ≡   Roundness

≡ Straightness                                         ≡  Surface inspection

≡ Roughness if ordered                         ≡  UT / ECT if ordered

Global Precision Steel Tube Standards and  Product Network

Each page answers a different market and purchasing intent while sharing one precision-tube manufacturing framework.

Different standards define different scopes, grades, manufacturing routes and acceptance rules. Similar grade names or historical references must not be treated as automatic equivalents.The finished store structure can connect standard pages to processing and application products.

Precision Tube Purchasing Questions

Q:  Is EN 10305 the same as EN 10305-1?

A:  No. EN 10305 is a multi-part series. Part 1 specifically covers seamless cold-drawn tubes for precision applications.

Q: What is the confirmed factory size range?

A:  The confirmed range is 15-70 mm outside diameter and 1-14 mm wall thickness. Specific combinations depend on grade, condition and tolerance.

Q: Can DIN 2391 still be ordered?

A:  DIN 2391 is a withdrawn legacy reference. Old drawings can be reviewed, but the current specification and all technical requirements must be confirmed before supply.

Q: Which delivery conditions are available?

A:  +C, +LC, +SR, +A and +N can be reviewed. Availability depends on grade, size, required properties and the ordered standard.

Q: Can the tubes be supplied as machined parts?

A:  Yes, cutting, chamfering, drilling, threading, CNC turning, honing and other operations can be reviewed against the drawing.

Q: How should the tolerance be specified?

A:  State whether OD, ID or wall is the primary controlled dimension and provide the required tolerance, surface, straightness and inspection method.