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U zaštitne cevi od čelika velike jačine spadaju sledeće:<br />

“Grade”<br />

Minimalna granica elastičnosti, (psi)<br />

P-110 110.000<br />

Q-125 125.000<br />

- “Grade“ V-150, sa minimalnom granicom elastičnosti 150.000 psi, nije<br />

API standard;<br />

- Ove zaštitne cevi moraju biti bešavne, tj. bez vara;<br />

- Kod ovih materijala nije definisana, tj. kontrolisana tvrdoća (HRC).<br />

σ<br />

ε<br />

σ - Minimalna granica elastičnosti<br />

17

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