NGHIEN CCPU-TRAO OOl NGHlfeN CUtJ NAU LUYEN MAC THEP 30CrMnSi TU" NGUYEN / LIEU SAT X P T R O N G L CAM UTVG STUDY ON MELTING 30CrMnSi STEEL FROM SPONGE IRON IN INDUCTION FURNACE TS Nguyin T r u ^ g An', Nguyen Manh Tien', Nguyin Quoc Vift^ 'Kfaoa Co khi, Hpc vien Ky thudt Qudn sv ^Vien Ky thudt Co gidi Qudn su, Tdng cue Ky thuat T M TAT Bdi bdo trinh bdy kit qud nghien ciru ndu luyen mdc thep 30CrMnSi tir nguyen lipu sdt xop dat yeu cdu v&i thdnh phan tugng duang mdc 30XrC, theo tieu chudn FOCT 4543-71 Kit qud nghien ciht cho thdy sat xop Id nguyen Hpu sqch co hdm lugng P% vd S% thdp co the su di^ng de che tgo cdc sdn phdm quoc phong vd cdc ngdnh kinh te khdc Tir khda: Sat xop, thep 30CrMnSi, to chirc te vi 16 cdm img ABSTRACT This paperpresents the research results practicing 30CrMnSi steelfromsponge iron equivalent grade SOXTC (TOCT 4543-71) Tlie study results confirmed, sponge iron is clean materials conte S%, P% lower, can be used to manufijcture defense products and other economic sectors Keywords: Sponge iron; steels 30CrMnSi, microstructure, induction furnaces DJ^T VAN DE Thep 30CrMnSi la mac thep thupc hp thep hpp kim thap, dp ben cao Thep cd ham lupng C% trung binfa vd tdngfadmlupng nguyen td hpp kim cung d phgm vi trung binh Cdc nguyen td hpp kim tfaupc dang nguyen td thdng dung, khdng ddt vd de kiem Mdc thep cho co tinh tdng hpp tot, cd nguyen td cho dp thdm tdi tot, cd nguyen td fada b§n Ferrit Idm tdng dp bdn, cd tinh deo trung binfa, dl gia cdng Mdc thep dupc sd dyng rpng rai de che tao cdc chi tiet true, bdnh rang, sdn xudt d td, mdy keo, cdc may mdc ddn dung va cdc trang bi qudn sir dac biet la su dyng ldm cdc cfai tidt cho cdc (oai vu vd ten lira, Viec nau luypn mdc tfaep vdi vat lipu gang vd thep phe da dupc nfaieu nhd mdy sdn xudt, nhien, de Iuyen dupc mdc thep cd ham lupng tap cfadt thdp, P, S thdp, thap, phdi sii dung cdng ngfae pfauc tap vd tdn kdm, kfad kfaan ^ ISSN 0866 - 7056 TAP CHf CO KHi VtET NAM, Sd 10 ndm 2016 www.cokhivietnam.vn NGHltN CU'U - TRAO D O I Ben canh do, ciing chua co nha miy nio t?o sin phim mang tinh thucrng phim Hien nay, nhct CO sit xdp, mgt nguyen lieu sach ham lugng tap chit thip, P, S thip, chiia mgt lugng oxy nhit djnh, dugc luyen 16 cim ung c6 ttoh nang soi, khuiy dio nuoc thep tao thuan lgi cho viec khu tap chit Theo tii lieu [2], cho thiy, cic mic thep dugc luyen tu sit x6p dat yeu cau ve thinh phan nhung tinh nang ca hgc lai vugt trOi so vdi mic thep cimg loai dugc luyen tir 100% thep phi Do vgy, viec nghien cuu thuc nghiem luygn mic thep 30CrMnSi bing nguyen ligu sat x6p Mirex 16 cim inig de tao mic thep 30CrMnSi c6 hira lugng P, S < 0.035 li cip thik NOI DUNG NGHrtN c t r u 2.1 Trlnh tyr tiln hinh thirc nghigm Qui trinh nghien cuu thuc nghigm dugc tien hinh bao g6m cic buoc theo trinh ttr nhu tren hinh 1, bao g5m: Chuin bj ph6i ligu va thiit bi niu luyen; tien hanh niu luygn, hgp kim hoa va diSu chinh phin; r6t diic phoi; kiim tra thinh phin va xic djnh to chiic phoi due * Niu I q * tnng l6cioidig,to kmbii.(liiii * RMdKffam * KinitiftiA Hinh l.Sadd cdc bu&c lien hdnh thifc nghigm 2.2 Chuin bi nguySn vat li^u Qui trinh niu luyen dugc thuc hi^n tji Nhi miy thugc Cong ty C6 phin Khoing sin vi Luygn kun Vigt Nam (MIREX) dp tai Cao Bing Tiin hinh tinh toin ph6i li$u theo ty if khdi lugng giiia sit x6p vi th^p phe li 30:70%,khdi lugng cy the dugc tinh toin niu 16 cim umg tin Nguyen ligu sat xop Mirex Cao Bing cung cip dugc kiim tra vi tr^g thii vi thinh phin nhu tbing Thep phi vi fero dim bio yeu ciu nhu bing vi dugc chuin bj vi kich thu6c de thuin den cho qui Ixinh nau Bdng Nguyen lieu sdt xdp dugc sdy kho vdkiSm tra thdnh phan [1] Tong sit 86^92 SSt kim lo^i 80-82 Thinh phin cic nguySn t i (%) C P