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Introduction
EN
10305-3 specifies the technical delivery conditions for welded cold sized 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
sizing to achieve accurate dimensions, close tolerances and improved surface
quality.
EN
10305-3 tubes are primarily non-alloy precision steel tubes. Common material
grades include E155, E195, E235 and E275. They are used where dimensional
accuracy, consistent mechanical properties and controlled surface quality are
important.
Ladhani
Metal Corporation supplies EN 10305-3 welded cold sized tubes in required
grades, sizes, wall thicknesses, lengths, surface conditions and delivery
conditions.
Applicable Standard
EN
10305-3 – Steel Tubes for Precision Applications – Technical Delivery
Conditions – Part 3: Welded Cold Sized Tubes.
The
standard specifies requirements for chemical composition, mechanical
properties, delivery conditions, surface quality, dimensional tolerances,
testing, inspection and documentation.
Material Type
EN
10305-3 covers:
- Carbon
Steel Tubes
- Non-Alloy
Steel Tubes
- Precision
Steel Tubes
- Welded
Steel Tubes
- Cold
Sized Steel Tubes
- Precision
Mechanical Tubes
Stainless
steel is not the principal material category of EN 10305-3; the standard
primarily covers non-alloy precision steels.
Forms of Supply
- Welded
Cold Sized Tubes
- Precision
Welded Tubes
- Cold
Sized 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
Additional
steel grades may be specified by agreement between purchaser and manufacturer,
subject to agreed chemical composition and mechanical requirements.
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 delivery condition and tube dimensions.
|
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 |
340–480 |
235 |
25 |
|
E275 |
+N |
430–580 |
275 |
21 |
|
E155 |
+A |
280–390 |
— |
32 |
|
E195 |
+A |
320–440 |
— |
30 |
|
E235 |
+A |
340–480 |
— |
25 |
|
E275 |
+A |
430–580 |
— |
21 |
For
cold sized delivery conditions, mechanical properties can vary according to the
manufacturing route and degree of cold working.
Delivery Conditions
EN
10305-3 tubes can be supplied in different delivery conditions:
- +CR1
– Cold Rolled / Cold Sized
- +CR2
– Cold Rolled / Cold Sized
- +A
– Annealed
- +N
– Normalized
The
selected delivery condition influences tensile strength, yield strength,
elongation, hardness and formability.
Surface Finish
Surface
quality is an important characteristic of EN 10305-3 precision tubes.
- Cold
Sized Surface
- Smooth
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.
Dimensional Accuracy
EN
10305-3 tubes are supplied with controlled:
- Outside
Diameter
- Inside
Diameter
- Wall
Thickness
- Eccentricity
- Straightness
- Length
- Surface
Quality
Closer
or special dimensional tolerances can be specified by agreement.
Standard Sizes
EN
10305-3 covers welded cold sized tubes with circular cross-sections in
specified outside diameters and wall thicknesses.
- 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
sized precision finish
- Accurate
outside dimensions
- Controlled
wall thickness
- Good
dimensional stability
- Controlled
surface quality
- Good
straightness
- Consistent
mechanical properties
- Suitable
for precision components
- Suitable
for mechanical engineering applications
Applications
Automotive Industry
- Fuel-system
components
- Shock
absorber components
- Steering
components
- Precision
mechanical parts
- Automotive
tubular components
- Structural
tubular components
Hydraulic and Pneumatic Systems
- Hydraulic
components
- Pneumatic
components
- Cylinder
components
- Precision
tubing
- Fluid
handling components
General Engineering
- Machine
components
- Bushes
- Sleeves
- Guides
- Mechanical
assemblies
- Precision
fabricated components
Furniture and Tubular Products
- Precision
furniture tubes
- Frames
- Supports
- Tubular
components
- Light
engineering structures
Fabrication and Machining
EN
10305-3 tubes can be cut, bent, formed, machined and fabricated according to
the selected grade, dimensions and delivery condition.
Where
substantial bending or forming is required, an appropriate annealed or
normalized condition can be selected to provide improved formability.
Heat Treatment
Heat-treatment
conditions associated with EN 10305-3 include:
- Annealing
- Normalizing
- Stress
Relieving where specified
Cold
sizing influences the final dimensional and mechanical characteristics of the
tube. Heat treatment can be selected according to the required properties and
processing requirements.
Advantages
- High
dimensional accuracy
- Controlled
surface finish
- Welded
construction
- Close
diameter tolerances
- Controlled
wall thickness
- Good
straightness
- Consistent
mechanical properties
- Suitable
for precision machining
- Suitable
for automotive components
- Suitable
for mechanical engineering applications
- Multiple
delivery conditions
Conclusion
EN
10305-3 welded cold sized steel tubes are precision steel tubes designed for
applications requiring accurate dimensions, controlled surface quality, close
tolerances and reliable mechanical properties. Common grades include E155,
E195, E235 and E275, with tubes available in different delivery conditions
according to the required properties and processing requirements.
Ladhani Metal Corporation supplies EN 10305-3 welded cold sized 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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