Abstract
Some basic metallurgical principles necessary for the processing of steel X20 Cr-Mo-V 12·1 are detailed by particularly CCT curves, forgeability and relaxation curves. These studies allow us to perform welded and bended pipes with results satisfactory with regard to German standard DIN 17175. Ageing tests carried out on this steel show no problem in relation to embrittlement. Low-cycle fatigue tests have been performed in the range of temperatures 350–600°C. For several temperatures, low-cycle fatigue equations have been specified. Finally crack-growth tests, performed at room temperature, show that the cracking growth rates are very similar for the parent metal, heat affected zone and weld.
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