FIELD: technological processes, metallurgy.
SUBSTANCE: method includes casting of hollow ingots with electroslag remelting, drilling of central opening with diameter of 100±5 mm, their heating to temperature of plasticity, volume expansion into hollow billets - cartridges with further turning and their boring into billets with removal of metal until forging defects are cleared with removal of metal, and value of metal removal is determined based on the following expressions Δ=K*D/S, Δ1=K1*D/S, where Δ - value of removed layer of metal during turning of hollow ingots-cartridges, mm; Δ1 - value of removed layer of metal during boring of hollow ingots-cartridges, mm; D - external diameter of hollow ingots-cartridges, mm; S - thickness of hollow ingots-cartridges walls, mm; K=0.3-0.4 - coefficient for determination of amount of removed metal layer during boring of ingots-cartridges, large amounts of which are related to steels with high content of alloying elements; K1=0.4-0.5 - coefficient for determination of amount of removed metal layer during boring of ingots-cartridges, high amounts of which are related to steels with high content of alloying elements; bottom part of hollow ingots-cartridges of electroslag remelting is removed with anode-mechanical cutting, value of which is determined based on expression L=K2*D/S, where K2=15-20 - coefficient for determination of value of removed bottom part of ingots-cartridges, high values of which are related to steels with high content of alloying elements.
EFFECT: expansion of assortment of pipes from hardly-deformed grades of steel and alloys on tube-rolling plants with Pilger rolling mills, reduction of metal consumption, lower possibility of defects creation in the form of skins and fissures, lower loads on drive of Pilger rolling mills, exclusion of spindles and ckrollers breakdown, reduction of cost of pipes production from expensive hardly-deformed grades of steel and alloys.
2 cl, 1 tbl
| Title | Year | Author | Number |
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| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES OF LARGE- AND MEAN-DIAMETERS OF HARD-TO-FORM STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2005 |
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RU2322316C2 |
| PRODUCTION OF 550×25-30 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL | 2014 |
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| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES OF LARGE AND MEAN DIAMETERS OF CORROSION RESISTANT HARD-TO-FORM KINDS OF STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2006 |
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