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Articles by H. Keshmiri
Total Records ( 1 ) for H. Keshmiri
  G.R. Ebrahimi , H. Keshmiri and H. Arabshahi
  In making tubes of corrosion resistant and hardly deformed steels and alloys, the pilger rolling method is used for hot rolling of final thick-walled tubes or mother tubes of large diameters (above 300 mm) and small quantities of other size tubes when no other, more efficient tube rolling or extrusion equipment is available. To clarify individual parameters of the production process and make choice of the deformation and temperature parameters, mechanical properties of the alloy type 30Cr25Ni32Mo3 superaustenitic stainless steel at various temperatures were studied. The tests have been performed using samples taken from the forged 400 mm diameter billet to determine strength and plastic properties of the billet metal at various temperatures and its macro and microstructure. The test results will be used in the choice of optimum conditions of preheating of the billets and hot rolling of tubes. On the whole, it should be stated that as forged alloy 30Cr25Ni32Mo3 features a favorable combination of strength and plastic properties in the hot working temperature range of 1075-1200°C.
 
 
 
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