DIN 1630 st37.4, st44.4, st52.4 seamless steel pipes are predominantly used in the construction of chemical plant, vessels, pipework and for general mechanical engineering purposes. They are designed to meet high performance requirements. Normally there are no limiting values or the maximum permissible woking pressure of these tubes.
The limitsd of application and other specifications given in DIN 1630 shall apply except in cases herer other specifications are contained in codes of practice for specific fields of application, e.g. the Thechnical rules on steam boilers or thechnical rules on pressure vessels, Ad instrucation sheets.
st37.4, st44.4, st52.4 seamless steel pipes chemical composition
| Steel grade | Material
Number |
Chemical composition | ||||
| C,max | Si,max | Mn | P,max | S,max | ||
| St37.4 | 1.0255 | 0.17 | 0.35 | 0.35 | 0.040 | 0.040 |
| St44.4 | 1.0257 | 0.20 | 0.35 | 0.40 | 0.040 | 0.040 |
| St52.4 | 1.0581 | 0.22 | 0.35 | 1.60 | 0.040 | 0.035 |
st37.4, st44.4, st52.4 seamless steel pipes mechanical property
| Grade | Material number | Yield strength | Tensile strength | Elongation,% |
| St37.4 | 1.0255 | 235 | 350-480 | 25 |
| St44.4 | 1.0257 | 275 | 420-550 | 21 |
| St52.4 | 1.0581 | 345 | 500-650 | 21 |
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