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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.).
Description
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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