{"title":"未变形连续铸轧管坯金属的加工塑性","authors":"L. Opryshko, T. V. Golovniak","doi":"10.15407/STEELCAST2021.01.014","DOIUrl":null,"url":null,"abstract":"The article presents results of studies of processing plasticity (ability to hot working) of metal of nondeformed continuously cast tube billets (CCTB) from carbon steel grades produced by MZ Dniprostal LLC. Processing plasticity of continuously cast billets was studied by testing for hot twisting in the temperature range from 1100 to 1250 ° C on State Enterprise “SRTI” equipment. Hot twisting tests were performed with CCTBs having various macrocrystalline structures. Temperature ranges of maximum plasticity of metal of the CCTBs manufactured from carbon steel grades have been determined. Distribution of hot twisting test parameters (the number of twists to failure and the twisting force) over the CCTB cross section has been studied. Influence of macrocrystalline structure on behavior of the CCTB metal during the hot twisting tests was revealed. The study results are of great scientific and practical importance in the context of ever growing use of CCTBs in production of tubes for various purposes. The results obtained for the first time in the studies of processing plasticity of metal of nondeformed continuously cast tube billets made of carbon steel grades with various macrocrystalline structures will make it possible to recommend optimal temperatures for heating initial CCTBs before hot rolling. Heating continuously cast billets according to optimal temperatures with taking into account their actual macrocrystalline structure will im-prove plasticity and reduce resistance to deformation of metal of these billets during the piercing process and, accord-ingly, minimize formation of surface defects in the tubes produced from the CCTBs. The study results will also serve as a basis for improving the CCTB manufacture technology at MZ Dniprostal LLC in order to obtain a macrocrystalline structure of the billet metal which will ensure a satisfactory level of processing plasticity as well as a more uniform distribution of plastic properties over the CCTB section.","PeriodicalId":33778,"journal":{"name":"Metall i lit''e Ukrainy","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Processing plasticity of metal of nondeformed continuously cast tube billets\",\"authors\":\"L. Opryshko, T. V. Golovniak\",\"doi\":\"10.15407/STEELCAST2021.01.014\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The article presents results of studies of processing plasticity (ability to hot working) of metal of nondeformed continuously cast tube billets (CCTB) from carbon steel grades produced by MZ Dniprostal LLC. Processing plasticity of continuously cast billets was studied by testing for hot twisting in the temperature range from 1100 to 1250 ° C on State Enterprise “SRTI” equipment. Hot twisting tests were performed with CCTBs having various macrocrystalline structures. Temperature ranges of maximum plasticity of metal of the CCTBs manufactured from carbon steel grades have been determined. Distribution of hot twisting test parameters (the number of twists to failure and the twisting force) over the CCTB cross section has been studied. Influence of macrocrystalline structure on behavior of the CCTB metal during the hot twisting tests was revealed. The study results are of great scientific and practical importance in the context of ever growing use of CCTBs in production of tubes for various purposes. The results obtained for the first time in the studies of processing plasticity of metal of nondeformed continuously cast tube billets made of carbon steel grades with various macrocrystalline structures will make it possible to recommend optimal temperatures for heating initial CCTBs before hot rolling. Heating continuously cast billets according to optimal temperatures with taking into account their actual macrocrystalline structure will im-prove plasticity and reduce resistance to deformation of metal of these billets during the piercing process and, accord-ingly, minimize formation of surface defects in the tubes produced from the CCTBs. The study results will also serve as a basis for improving the CCTB manufacture technology at MZ Dniprostal LLC in order to obtain a macrocrystalline structure of the billet metal which will ensure a satisfactory level of processing plasticity as well as a more uniform distribution of plastic properties over the CCTB section.\",\"PeriodicalId\":33778,\"journal\":{\"name\":\"Metall i lit''e Ukrainy\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2021-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Metall i lit''e Ukrainy\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.15407/STEELCAST2021.01.014\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metall i lit''e Ukrainy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.15407/STEELCAST2021.01.014","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Processing plasticity of metal of nondeformed continuously cast tube billets
The article presents results of studies of processing plasticity (ability to hot working) of metal of nondeformed continuously cast tube billets (CCTB) from carbon steel grades produced by MZ Dniprostal LLC. Processing plasticity of continuously cast billets was studied by testing for hot twisting in the temperature range from 1100 to 1250 ° C on State Enterprise “SRTI” equipment. Hot twisting tests were performed with CCTBs having various macrocrystalline structures. Temperature ranges of maximum plasticity of metal of the CCTBs manufactured from carbon steel grades have been determined. Distribution of hot twisting test parameters (the number of twists to failure and the twisting force) over the CCTB cross section has been studied. Influence of macrocrystalline structure on behavior of the CCTB metal during the hot twisting tests was revealed. The study results are of great scientific and practical importance in the context of ever growing use of CCTBs in production of tubes for various purposes. The results obtained for the first time in the studies of processing plasticity of metal of nondeformed continuously cast tube billets made of carbon steel grades with various macrocrystalline structures will make it possible to recommend optimal temperatures for heating initial CCTBs before hot rolling. Heating continuously cast billets according to optimal temperatures with taking into account their actual macrocrystalline structure will im-prove plasticity and reduce resistance to deformation of metal of these billets during the piercing process and, accord-ingly, minimize formation of surface defects in the tubes produced from the CCTBs. The study results will also serve as a basis for improving the CCTB manufacture technology at MZ Dniprostal LLC in order to obtain a macrocrystalline structure of the billet metal which will ensure a satisfactory level of processing plasticity as well as a more uniform distribution of plastic properties over the CCTB section.
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