Search academic texts

Information × Registration Number 0210U007221, 0109U008111 , R & D reports Title Development of the technology of manufacture and extending the product range of boiler tubes produced according to TU 14-3-460 from non-worked continuously cast billets of carbon and low alloy steel grades at VTZ JSC. popup.stage_title Head Opryshko Lyudmila Vasylivna, Registration Date 05-11-2010 Organization Ya.Ye.Osada State Scientific Research Tube Institute popup.description2 Based on the experience gained in the production of small size extruded tubes, basic technology parameters (boring diameter, wall thickness variation, surface quality, expansion and thermal treatment schedules) for the manufacture of 42 x 3,5-4 mm boiler tubes from continuously cast and turned 145-150 mm diameter billets have been developed, tested and introduced in the manufacture. It was found practical to use the direct extrusion method (without expansion but with diameter enlargement by boring). Shortening of holding times (from 3 to 1 hour) during 12Kh1MF steel tube tempering has been substantiated. Feasibility of exclusion of thermal treatment of 20 steel tubes from a separate heat has ben shown. By the results of dmensional (diameter and wall thickness) control of the tubes produced by the developed technology, 89,4% of their quantity are within the tolerance limits for the cold-worked tubes and 97,2% for the hot-worked tubes of improved quality. By all structure indices, technological and mechanical properties, the hot-worked tubes meet requirements of TU 14-3-460 after a corresponding heat treatment., Product Description popup.authors Перепелиця Тетяна Вікторівна Царьков Олексій Костянтинович popup.nrat_date 2020-04-02 Close