The paper presents results of studies on the crystallite sizes of oxide layer formed during a long-term operation on 13CrMo4-5 steel at an elevated temperature (T=470oC, t=190,000h). This value was determined by a method based on analysis of the diffraction line profile, according to a Scherrer formula. The oxide layer was studied on a surface and a cross-section at the outer and inner site on the pipe. X-ray studies were carried out on the surface of a tube, then the layer’s surface was polished and the diffraction measurements repeated to reveal differences in the originated oxides layer.Keywords: 13CrMo4-5 steel, XRD diffraction, crystallite sizes
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