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Information × Registration Number 0308U003305, 0106U008926 , R & D reports Title Certification testing hot extruded up to 219 mm diameter. 20-30 mm wall thickness and 245 mm diameter boiler tubes made from non-worked continuously cast billets of 20 grade steel at "VTZ" JSC. Wprking out amendments in normative documents popup.stage_title Атестаційні випробування котельних гарячепресованих труб діаметром до 219мм включно з товщиною стінки 20-30 мм та діаметром 245 мм з недеформованої безперервнолитої заготовки сталі 20 виробництва ВАТ "ВТЗ" Розробка змін у нормативній документації Head Oprishko L.V., Registration Date 21-03-2008 Organization State Scientific Research Tube Institute popup.description2 All-round stadies of heat resistances propertues of metal of hot-rolled boiler made of St.20 steel grade with wall thickness above 20 mm rolled at various elongation coefficients using nonworked continuously cast billets . A dependence of the long-term strength and workability at nigh temperatures and roll pressures on the billet quality and elongation coefficient during extrusion. Basing on the investigation results, a permission for the commeroial production of boiler tubes in a wider size range up to 219 mm diameter and more 20mm wall thickness has been issued and given to VTZ JSC Product Description popup.authors popup.nrat_date 2020-04-02 Close