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Introduction
EN 10305-2 specifies the
technical delivery conditions for welded cold drawn steel tubes of circular
cross-section used for precision applications. The tubes are manufactured from
strip or sheet by forming and welding, followed by cold drawing to achieve
accurate dimensions, close tolerances and improved surface quality.
EN 10305-2 tubes are primarily
precision carbon and non-alloy steel tubes. Common material grades include
E155, E195, E235 and E275. They are used where dimensional accuracy, surface
quality and consistent mechanical properties are required.
Ladhani Metal Corporation
supplies EN 10305-2 welded cold drawn tubes in required grades, sizes, wall
thicknesses, surface conditions and delivery conditions.
Applicable Standard
EN 10305-2 – Steel Tubes for
Precision Applications – Technical Delivery Conditions – Part 2: Welded Cold
Drawn Tubes.
The standard specifies
requirements for chemical composition, mechanical properties, delivery
conditions, surface quality, dimensional tolerances, testing, inspection and
documentation.
Material Type
EN 10305-2 covers:
- Carbon Steel Tubes
- Non-Alloy Steel Tubes
- Precision Steel Tubes
- Welded Steel Tubes
- Cold Drawn Steel Tubes
- Precision Mechanical Tubes
Stainless steel is not the
principal material category of EN 10305-2; the specified grades are
predominantly non-alloy precision steels.
Forms of Supply
- Welded Cold Drawn Tubes
- Precision Welded Tubes
- Cold Drawn Steel Tubes
- Cold Finished Tubes
- Round Tubes
- Precision Mechanical Tubes
- Hydraulic Tubes
- Pneumatic Tubes
- Straight Length Tubes
- Cut-to-Length Tubes
- Custom Dimension Tubes
Grades Covered
E155 | E195 | E235 | E275
The standard also permits
other steel grades to be specified by agreement, provided the required chemical
composition and mechanical properties are agreed between purchaser and
manufacturer.
Grade Designation
- E155 – Non-alloy precision steel
grade with minimum yield strength of 155 MPa in the normalized condition
- E195 – Non-alloy precision steel
grade with minimum yield strength of 195 MPa in the normalized condition
- E235 – Non-alloy precision steel
grade with minimum yield strength of 235 MPa in the normalized condition
- E275 – Non-alloy precision steel
grade with minimum yield strength of 275 MPa in the normalized condition
Chemical Composition
|
Grade |
Steel No. |
C Max. % |
Si Max. % |
Mn Max. % |
P Max. % |
S Max. % |
|
E155 |
1.0033 |
0.11 |
0.35 |
0.70 |
0.025 |
0.025 |
|
E195 |
1.0034 |
0.15 |
0.35 |
0.60 |
0.025 |
0.025 |
|
E235 |
1.0308 |
0.17 |
0.35 |
1.20 |
0.025 |
0.025 |
|
E275 |
1.0225 |
0.21 |
0.35 |
1.40 |
0.025 |
0.025 |
The chemical composition
requirements apply to the specified steel grades, with additional requirements
possible by agreement.
Mechanical Properties
Mechanical properties depend
on the selected delivery condition.
|
Grade |
Delivery Condition |
Tensile Strength MPa |
Yield Strength Min. MPa |
Elongation Min. % |
|
E155 |
+N |
300–450 |
155 |
30 |
|
E195 |
+N |
350–500 |
195 |
28 |
|
E235 |
+N |
440–570 |
235 |
25 |
|
E275 |
+N |
580–720 |
275 |
21 |
|
E155 |
+A |
280–390 |
— |
32 |
|
E195 |
+A |
320–440 |
— |
30 |
|
E235 |
+A |
340–480 |
— |
25 |
|
E275 |
+A |
430–580 |
— |
21 |
For cold drawn conditions,
mechanical properties depend on the degree of cold working and the selected
delivery condition.
Delivery Conditions
EN 10305-2 tubes can be
supplied in different delivery conditions:
- +C – Cold Drawn / Hard
- +LC – Cold Drawn / Soft
- +SR – Cold Drawn and Stress
Relieved
- +A – Annealed
- +N – Normalized
The selected delivery
condition affects tensile strength, yield strength, elongation, hardness and
formability.
Surface Finish
Surface quality is an
important characteristic of EN 10305-2 precision tubes.
- Cold Drawn Surface
- Smooth Precision Surface
- Bright Surface
- Fine Surface Finish
- Controlled Surface Quality
- Surface Suitable for Further
Processing
- Specified Surface Roughness
Additional surface
requirements can be agreed between purchaser and manufacturer where required.
Dimensional Accuracy
EN 10305-2 tubes are
manufactured with controlled:
- Outside Diameter
- Inside Diameter
- Wall Thickness
- Eccentricity
- Straightness
- Length
- Surface Roughness
Closer or special dimensional
tolerances can be specified by agreement.
Standard Sizes
EN 10305-2 covers circular
welded cold drawn precision tubes in a range of outside diameters and wall
thicknesses specified by the standard.
- Outside Diameter: According to
standard size range
- Wall Thickness: According to
diameter and manufacturing capability
- Length: Random or fixed lengths
- Inside Diameter: Controlled according
to order
- Custom Tolerances: Available by
agreement
Key Features
- Welded construction
- Cold drawn precision finish
- Excellent dimensional accuracy
- Tight dimensional tolerances
- Controlled surface quality
- Good concentricity
- Good straightness
- Consistent mechanical properties
- Suitable for precision components
- Suitable for hydraulic and
pneumatic systems
Applications
Automotive Industry
- Fuel-system components
- Hydraulic components
- Shock absorber components
- Steering components
- Precision mechanical parts
- Automotive tubular components
Hydraulic and Pneumatic Systems
- Hydraulic cylinders
- Pneumatic cylinders
- Hydraulic lines
- Precision pressure tubes
- Cylinder components
General Engineering
- Machine components
- Precision shafts
- Bushes
- Sleeves
- Guides
- Mechanical assemblies
Furniture and Tubular Products
- Precision furniture tubes
- Frames
- Supports
- Tubular components
EN 10305-2 tubes are used in
automotive, mechanical engineering, furniture and general industrial
applications where precision welded tubing is required.
Fabrication and Machining
EN 10305-2 tubes can be cut,
bent, formed, machined and fabricated according to the selected grade and
delivery condition.
Cold drawn tubes supplied in
+C condition provide increased strength but generally have lower formability
than annealed material. For applications involving additional bending or
forming, an appropriate delivery condition should be selected.
Heat Treatment
Heat-treatment and delivery
conditions covered by the standard include:
- Annealing
- Normalizing
- Stress Relieving
Cold drawing changes the
mechanical properties of the welded tube. Subsequent heat treatment can be used
to obtain the required mechanical properties and formability.
Advantages
- High dimensional precision
- Excellent surface finish
- Welded construction
- Close diameter and wall-thickness
tolerances
- Good concentricity
- Suitable for precision machining
- Suitable for hydraulic and
pneumatic components
- Multiple delivery conditions
- Good formability in suitable
delivery conditions
- Suitable for automotive and
engineering components
Conclusion
EN 10305-2 welded cold drawn
steel tubes are precision steel tubes designed for applications requiring
accurate dimensions, controlled surface quality, close tolerances and reliable
mechanical properties. The principal grades include E155, E195, E235 and E275,
with tubes available in delivery conditions such as +C, +LC, +SR, +A and +N.
Ladhani Metal Corporation
supplies EN 10305-2 welded cold drawn tubes in required grades, outside
diameters, wall thicknesses, lengths, surface finishes and delivery conditions,
with mill test certificates and inspection documentation as required.
FOR REQUIREMENT OF THIS GRADE
OR FOR DETAIL CONTACT US AT :-
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