engleski

Statistical Processing of Mechanical Properties of N80 Quality Casing Tubes

The paper presents statistical processing of the test results of mechanical properties of Casing tubes according to the API 5CT standard and N80 quality degree. Tubes size is 95/8° (244, 48 mm) × 11, 00 mm. Required mechanical properties are as follows: Reh = min. 689, 6 MPa and A5 = min. 16%. Statistical processing was made by means of Gauss’ curves and controlling boundaries. The testing results relate to the tubes manufactured in MECHEL - Željezara d. o. o., Sisak, Croatia. Through the processing of the results the stability of the manufacturing process, i.e. high tubes quality intended or oil industry, was acknowledged.

mechanical properties; casing tubes

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