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DIN 17121-84 seamless circular steel tubes

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.processChemical composition(%)

(max)

SiMn

P

(max)

S

(max)

NiCrMoothers(max)
Rst37-2S0.17--0.0500.050---

N

 0.009

St37-3S0.17--0.0400.040-
---
St44-2S0.21--0.0500.050---

N

 0.009

St44-3S0.20--0.0400.040----
St52-3S0.23--0.0400.040----

2.Mechanical property


Gradematerial number
Tensile test MPA or N/mm²

Remarks

similiar to JIS

Min Yield pointMin Yield pointTensile Strength
Rst37-21.0038

t 16mm max235

16mm<t 40mm max 225 

65mm max 215

340-470-
St37-31.0116

t 16mm max275

16mm <t 40mm max225

40mm max<t 65mm max max215


340-470-
St44-21.0044

t 16mm max275

16mm<t 40mm max265 

40mm max<t 65mm max 225

410-540STK400
St44-31.0144

t 16mm max275

16mm<t 40mm max265

40mm max<t 65mm max 225

410-540STK400
St52-31.0570

16mm<t 40mm max345 

 40mm max<t 65mm max 335

490-630STK500



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