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DIN 17121 Seamless Circular Steel Tubes For Structural Steel Work
There are five steel grades in DIN 17121 standard. RSt37-2, St37-3, St44-2, St44-3, St52-3. These steel tubes are produced by non- welding and made from killed steels. So many specification for your reference, your enquiry will be highly appreciated!
Description
DIN 17121 Seamless Circular Steel Tubes
DIN 17121 standard applies to seamless circular tubes made from semi- killed steels and fully killed steels. Seamless steel tubes in this specification are used in structural steel work such as in building and civil engineering, tubular steel construction, bridge and crane construction, etc.
Chemical composition % and mechanical properties
Steel grade | C max | P & S max | N max | Yield strength | Tensile strength | Elongation % min | |
longitudinal | transverse | ||||||
RSt37-2 | 0.17 | 0.05 | 0.009 | WT≤16mm 235MPa WT16mm-40mm 225MPa WT40mm-65mm 215MPa |
340-470MPa
| 26 | 24 |
St37-3 | 0.17 | 0.04 | - | WT≤16mm 235MPa WT16mm-40mm 225MPa WT40mm-65mm 215MPa |
340-470MPa
| 26 | 24 |
St44-2 | 0.21 | 0.05 | 0.009 | WT≤16mm 275MPa WT16mm-40mm 265MPa WT40mm-65mm 255MPa | 410-540MPa | 22 | 20 |
St44-3 | 0.20 | 0.04 | - | WT≤16mm 275MPa WT16mm-40mm 265MPa WT40mm-65mm 255MPa | 410-540MPa | 22 | 20 |
St52-3 | 0.22 | 0.04 | - | WT≤16mm 355MPa WT16mm-40mm 345MPa WT40mm-65mm 335MPa | 490-630MPa | 22 | 20 |
Specification
Product name: Seamless circular steel tubes
Outside diameter: 10.3mm-914.4mm/DN6-DN900
Wall thickness: 1.73mm-59.54mm/SCH10, SCH20, SCH30, SCH40, SCH60, SCH80, SCH100, SCH120, SCH140, SCH160, STD, XS, XXS.
Unit length: single random length 5-5.8m, double random length 10-11.8m, fixed length 6m or 12m at purchasers’ optional.
Painting: we can offer black painting, varnishing, hot dipped galvanizing, 3LPE, FBE service on the internal or external surface of steel tubes according to customers' requirements.
Packing: in loose, in bundles, wooden cases protection at the both sides of tubes for sea-worthy transportation or as requested.
Permissible deviations in length
Length up to 6m: 0/+500mm
Length over 6m up to: 12m 0/+15mm
Length over 12m by agreement.
Allowable weight deviation
Weight for an individual tube: -8%/+12%
Weight for a batch of tubes not less than 10mt: -5%/+10%
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2. We support free samples. You only need to pay express charges. If you have any questions we will quickly respond to you and we believe that you satisfy with our sample service.
3. Quality assurance. We will guarantee for you that the quality of all the goods is strictly inspected and carefully packaged before shipment, you can rest your heart to purchase our products.
4. Delivery on time. Our products will be shipped within the specified period in contract. We will update shipment tracking for you so that you have plenty of time to arrange your job.
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