API 5L X80 Steel

Steel name: API 5L X80
Diagram No.: 8977
Type of diagram: CCT
Chemical composition in weight %: 0.04% C, 0.32% Si, 1.56% Mn, 0.19% Mo, 0.01% V, 0.03% Nb, 0.01% Ti
Steel group: Pipeline steels
Note: (a) Continuous cooling transformation (CCT) diagram showing the variation of the Ar3 and Ar1 transformation temperatures as a function of the cooling rate (CR). The resultant Vickers hardness is reported after each cooling cycle. The corresponding microstructural characterization is presented for: BM (b, c); and after cooling rates of 0.5 (d, e); 5 (f, g); 20 (h, i); 40 (j, k) and 140 C s.1 (l, m). Microstructures: bainite packets with straight ferrite plates (B-SP), bainite packets with irregular ferrite plates (B-IP), granular bainite (GB), acicular ferrite (AF), polygonal ferrite (PF), quasi-polygonal ferrite (QPF), ferrite (F). Etched with Nital 3%. Red arrows: pearlite islands; yellow arrows: fine acicular secondary phases. (b, d, f, h, j, l) optical images and (c, e, g, i, k, m) SEM images.
Reference: Not shown in this demo version.

Transformation Diagram

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