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DIN 17121-84 seamless circular steel tubes
This standard applies to seamless circular tubes made from the steels listed in tables 1 and 2 These tubes are used in structural steelwork (as in building and civil engineering, tublar steel construction, bridge and crane construction, etc.).
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SEAMLESS CIRCULAR STEEL TUBES FOR STRUCTURAL STEEL WORK
1.Chemical composition
| Grade | Mfg.process | Chemical composition(%) | ||||||||
C (max) | Si | Mn | P (max) | S (max) | Ni | Cr | Mo | others(max) | ||
| Rst37-2 | S | 0.17 | - | - | 0.050 | 0.050 | - | - | - | N 0.009 |
| St37-3 | S | 0.17 | - | - | 0.040 | 0.040 | - | - | - | - |
| St44-2 | S | 0.21 | - | - | 0.050 | 0.050 | - | - | - | N 0.009 |
| St44-3 | S | 0.20 | - | - | 0.040 | 0.040 | - | - | - | - |
| St52-3 | S | 0.23 | - | - | 0.040 | 0.040 | - | - | - | - |
2.Mechanical property
| Grade | material number | Tensile test MPA or N/mm² | Remarks similiar to JIS | |
| Min Yield point | Min Yield point | Tensile Strength | ||
| Rst37-2 | 1.0038 | t 16mm max235 16mm＜t 40mm max 225 65mm max 215 | 340-470 | - |
| St37-3 | 1.0116 | t 16mm max275 16mm ＜t 40mm max225 40mm max＜t 65mm max max215 | 340-470 | - |
| St44-2 | 1.0044 | t 16mm max275 16mm＜t 40mm max265 40mm max＜t 65mm max 225 | 410-540 | STK400 |
| St44-3 | 1.0144 | t 16mm max275 16mm＜t 40mm max265 40mm max＜t 65mm max 225 | 410-540 | STK400 |
| St52-3 | 1.0570 | 16mm＜t 40mm max345 40mm max＜t 65mm max 335 | 490-630 | STK500 |
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