METHOD OF BLADES MANUFACTURING

FIELD: metallurgy. ^ SUBSTANCE: invention concerns metallurgy field. Particularly it concerns rolling mill, and can be used at manufacturing on continuous broad-strip mill of strips for electro-welded straight-line-seam casings, intended for development of oil and gas wells. For improving of blades...

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Main Authors POPOV EVGENIJ SERGEEVICH, MAL'TSEV ANDREJ BORISOVICH, NEMTINOV ALEKSANDR ANATOL'EVICH, TRAJNO ALEKSANDR IVANOVICH, TOROPOV SERGEJ SERGEEVICH, ROSLJAKOVA NATAL'JA EVGEN'EVNA, GOLOVANOV ALEKSANDR VASIL'EVICH, FILATOV NIKOLAJ VLADIMIROVICH
Format Patent
LanguageEnglish
Russian
Published 10.02.2009
Subjects
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:FIELD: metallurgy. ^ SUBSTANCE: invention concerns metallurgy field. Particularly it concerns rolling mill, and can be used at manufacturing on continuous broad-strip mill of strips for electro-welded straight-line-seam casings, intended for development of oil and gas wells. For improving of blades and screening yield it is received slab from steel, containing following chemical composition: wt %: 0.18-0.26 C; 0.14-0.36 Si; 0.30-0.80 Mn; 0.7-1.1 Cr; 0.10-0.30 Mo; 0.01-0.06 Nb; 0.01-0.06 Al; not more than 0.06 V; not more than 0.05 Ti; not more than 0.30 Ni; not more than 0.20 Cu; not more than 0.005 S; not more than 0.015 P; not more than 0.008 N; the rest is Fe, at fulfillment of conditions: Nb+V+Ti<=0.15% and at pollution of steel structure by nitrides which are not larger than 2 points and other nonmetallics not larger than 2.5 points. Slab is exposed to heating, hot rolling with regulated finishing temperature with receiving of blade, cooling by water and blade is reeled into rolls. Finishing temperature is kept equal 880-920C, and blades cooling is implemented by water till temperature 630-690C. At that before heating for rolling slab is exposed to annealing by means of heating till 600-650C, cooling with speed not more than 25C/h till temperature not lower than 250C, reheating with speed not more than 60C/h till temperature 630-650C and further cooling by means of furnace. ^ EFFECT: improving of blades and recovery. ^ 3 cl, 1 ex, 3 tbl
Bibliography:Application Number: RU20070104506