Abstract
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.
Highlights
The superaustenitic grades of stainless steels provide excellent corrosion resistance as well as high strength levels [1]
As the austenitic steels are characterized by their low Stacking Fault Energy (SFE) [2], the dominant restoration processes during and after hot Deformation are dynamic and Metadynamic Recrystallizations (DRX and MDRX), respectively [3,4,5,6,7]
Mechanical properties accompanying with microstructural evaluation of the alloy type 30Cr25Ni32Mo3 Superaustenitic Stainless Steel at various temperatures were studied
Summary
The superaustenitic grades of stainless steels provide excellent corrosion resistance as well as high strength levels [1]. For the last two decades intensive studies have been down on the changes of austenitic microstructure and mechanical properties in steels with hot working conditions. Some research have been done to determine the best plasticity temperature range using the thermomechanical processing such as hot compression and hot torsion tests in steels[8,9,10,11,12]. Mechanical properties accompanying with microstructural evaluation of the alloy type 30Cr25Ni32Mo3 Superaustenitic Stainless Steel at various temperatures were studied. For this purpose tensile and torsion tests at various temperatures from 800 ̊C up to 1180 ̊C and 1000 ̊C up to 1200 ̊C have been done respectively
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