FIELD: tube production, namely processes for making cover type hexahedral tubes of low-ductile steel with boron content 1.3 - 1.8%, possibly heat shaping of mechanically worked seamless hot rolled conversion tubes of steel with boron content 1.3 - 1.8%.
SUBSTANCE: method comprises steps of rolling tubes, cutting them by blanks, mechanically working blanks in machine tools with servo system (turning and boring), degreasing, performing induction treatment and ultrasonic flaw detection, drilling openings for pulling chain at shaping, coating tubes with salt lubricant, heat shaping of them, degreasing, heat treating, controlling size, controlling camber value, marking up tubes and cutting them by measured length values, selecting templates for making mechanically tested samples of shaped portion of tube, straightening in press tube - blanks with camber value exceeding admissible one, controlling geometry size of hexahedrons, finally inspecting, stamping and packaging hexahedral tubes. Turning and boring, degreasing, induction treatment, ultrasonic flaw detection, drilling openings for pulling chain at shaping, coating tubes with salt lubricant and heat shaping of tubes are realized for tubes having two-, three-multiple length whose value is determined according to relation: Lt = (2 - 3)Lb + Ltr + Lo + Lec where Lb - length of hexahedral tube blank, mm; Ltr - length of tube transition portion from cylinder to hexahedron, mm; Lo -length of cylindrical part of tube-blank for drilling axial opening for pivot of pulling chain, mm; Lec - length of end crop, mm. Cutting tubes by measured length values, selection of templates for making samples, removal of end crop are realized after geometry size control and marking up of hexahedron tube lengths. Invention provides possibility for performing new process of manufacturing cover hexahedral tubes of low ductile steel with boron content 1.3 -1.8 %, lowered quantity of waste at conversion of hexahedral tube blanks from cylindrical tubes.
EFFECT: lowered factor of metal consumption at conversion of electroslag-refining ingot to hexahedral blank, lowered number of procedures for testing hexahedral tubes, reduced cost of ready product.
2 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PRODUCING COVER HEXAHEDRAL TUBE-BLANKS OF LOW-DUCTILE BORON-CONTAINING STEEL FOR COMPACTED STORAGE OF WASTE NUCLEAR FUEL | 2006 |
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| METHOD FOR PRODUCING INGOT-BLANKS BY ELECTROSLAG REFINING OF LOW-DUCTILE STEEL CONTAINING BORON AND FOR ROLLING TUBES OF SUCH BLANKS IN TUBE ROLLING PLANTS WITH PILGER MILLS FOR FURTHER CONVERSION OF TUBES TO HEXAHEDRAL TUBE-BLANKS FOR COMPACTED STORAGE OF WASTE NUCLEAR FUEL | 2006 |
|
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RU2547053C1 |
| METHOD FOR PRODUCING CONVERSION TUBES OF LOW DUCTILE BORON STEEL | 2006 |
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| PRODUCTION OF "TURNKEY" 255×5,0+1,5/-1,0×4300+80/-30 mm HEXAGONAL PIPE-BILLETS | 2013 |
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| METHOD OF MAKING 257+2,0/-3,0×6,0+2,0/-1,0×4300+80/-30 mm-HEXAGONAL TUBE BILLETS FOR PACKED STORAGE AND TRANSPORTATION OF USED NUCLEAR FUEL | 2011 |
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RU2470726C1 |
