EN 10305-1 Seamless Cold Drawn Tubes
EN 10305-1 Steel tubes for precision applications - Technical delivery conditions - Part 1: Seamless cold drawn tubes
EN 10305-1 Seamless cold drawn tubes
Beite Steel Pipe offers an extensive range of EN 10305 seamless precision steel tube.
EN 10305-1 Seamless cold drawn tubes
Beite Steel Pipe offers an extensive range of EN 10305 seamless precision steel tube.
Standard:EN 10305-1
EN 10305-1 European Standard specifies the technical delivery conditions for seamless cold drawn steel tubes of circular cross section for precision applications with specified outside diameter D ≤ 380 mm.
EN 10305-1may also be applied to other types of cross sections.
Tubes according to the EN 10305-1 are characterized by having precisely defined tolerances on dimensions and a specified maximum surface roughnes
Steel grade:
EN10305-1 E215
Imperfection
discontinuity in the wall or on the pipe surfaces detectable by methods described in this document
Note 1 to entry: Imperfections with a size complying with the acceptance criteria specified in this document are considered to have no practical implication on the intended use of the product.
Defect
imperfection of a size not complying with the acceptance criteria specified in this document
Note 1 to entry: Defects are considered to adversely affect or limit the intended use of the product.
Mother tube
length of tube produced in the final cold drawing process
Chemical composition of EN 10305-1 Seamless cold drawn tubes
Option 1: A steel grade not specified in this document, with a maximum total content of alloying elements of 5 % and agreed chemical composition, mechanical properties and delivery condition, is specified.
Table 2 — Chemical composition (cast analysis)
Manufacturing process
Steelmaking process
The steelmaking process is at the discretion of the manufacturer with the exception that the open hearth (Siemens-Martin) process shall not be employed unless in combination with a secondary steelmaking or ladle refining process.
Steels shall be fully killed.
NOTE This excludes the use of rimming, balanced or semi-killed steel.
Tube manufacture and delivery conditions
The tubes shall be manufactured from hot finished seamless hollows by cold drawing.
The tubes shall be supplied in one of the delivery conditions given in Table 1.
All non-destructive testing (NDT) activities shall be carried out by qualified and competent level 1, 2 and/or 3 personnel authorized to operate by the employer.
Table 1 — Delivery conditions
| Designation | Symbol a |
Description
|
| Cold drawn / hard | +C | No final heat treatment after final cold drawing. |
| Cold drawn / soft | +LC | Final heat treatment is followed by a suitable drawing pass (limited reduction of area) |
| Cold drawn and stress relieved | +SR | After final cold drawing the tubes are stress relieved in a controlled atmosphere. |
| Soft annealed | +A | After final cold drawing the tubes are soft annealed in a controlled atmosphere |
| Normalized | +N | After final cold drawing the tubes are normalized in a controlled atmosphere. |
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a:In accordance with EN 10027–1
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Chemical composition of EN 10305-1 Seamless cold drawn tubes
Option 1: A steel grade not specified in this document, with a maximum total content of alloying elements of 5 % and agreed chemical composition, mechanical properties and delivery condition, is specified.
Table 2 — Chemical composition (cast analysis)
| Steel grade | % by mass | ||||||
| Steel name |
Steel number
|
C max.
|
Si max. |
Mn max
|
P max. | S ,a max | Al,total b 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 |
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Elements not quoted in this table (but see footnote b ) shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for the purposes of deoxidation and/or nitrogen binding. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steel making process.
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a :See option 2.
b :This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements, such as Ti, Nb or V. If added, the content of these elements shall be reported in the inspection document.
When using titanium, the manufacturer shall verify that (Al + Ti/2) ≥ 0,020.
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Option 2: For the steel grades E235 and E355 a controlled sulphur content of 0,015 % to 0,040 % is specified to support machinability. It shall be obtained by resulphurizing the steel after maximum desulphurization or alternatively by using a low oxygen process.
Option 3: The chemical composition of the specified steel grade shall be such that it is suitable for hot-dip galvanizing (see e.g. EN ISO 1461 or EN ISO 14713-2 for guidance).
Mechanical properties
NOTE Subsequent processing (cold or hot) may change the mechanical properties.
Table 3 — Mechanical properties at room temperature
| Steel grade | Minimum values for the delivery condition a | ||||||||||||
| +C b | +LC b | +SR | +A c | +N | |||||||||
| Steel name | Steel number | R m (MPa) | A % | R m (MPa) | A % | R m (MPa) | R eH (MPa) | A % | R m (MPa) | A % | R m (MPa) |
R eH d
(MPa)
|
A % |
| E215 | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290 to 430 | 215 | 30 |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 440 to 480 | 235 | 25 |
| E355 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 e | 10 | 450 | 22 | 490 to 630 | 355 | 22 |
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a ,R m : tensile strength; R eH : upper yield strength (but see 11.1); A: elongation after fracture. For symbols for the delivery condition see Table 1.
b ,Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength. For calculation purposes the following relationships are recommended:
— for delivery condition +C: R eH ≥ 0,8 R m ;
— for delivery condition +LC: R eH ≥ 0,7 R m.
c ,For calculation purposes the following relationship is recommended: R eH ≥ 0,5 R m .
d ,For tubes with outside diameter ≤ 30 mm and wall thickness ≤ 3 mm the R eH minimum values are 10 MPa lower than the values given in this table.
e ,For tubes with outside diameter > 160 mm: R eH ≥ 420 MPa.
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Summary of inspection and testing
Table 4 — Summary of inspection and testing
| Type of inspection or test | Frequency of testing a | ||
|
Non-specific inspection
|
Specific inspection | ||
| Mandatory | Chemical analysis | M | M |
| Tensile test | M | One per test unit | |
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Dimensional inspection
|
M | M | |
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Visual examination
|
M | M | |
| Optional | Flattening test or drift expanding test (Option 25) b | M | One per test unit |
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Roughness measurement (Options 8 and 9)
|
not applicable | One per test unit | |
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NDT on longitudinal imperfections (Option 12)
|
Each individual tube | ||
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NDT for verification of leak tightness (Option 13)
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a ,M: According to manufacturer's procedure.
b ,Option 25: For tubes in the delivery condition soft annealed (+A) or normalized (+N) a flattening test or a drift expanding test shall be carried out. The test method is at the discretion of the manufactur
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Protection and packaging
The tubes shall be delivered with a temporary corrosion prottion. The type of protection shall be at the discretion of the manufacturer, unless option 4 or 5 is specified.
Option 4: The tubes shall be delivered without corrosion protection.
Option 5: The tubes shall be delivered with a specified corrosion protection to be agreed at the time of enquiry and order.
NOTE Unprotected tubes are prone to corrosion at any stage of storage or transportation.
The tubes shall be delivered bundled, unless option 6 is specified.
Option 6: Supply of unbundled tubes or application of a specific packaging method is specified.