摘要:
In a high-speed electrogalvanizing process, steel strip (1) is protected from the formation of troublesome zinc nodules by masking the edges (12) of the strip, while the strip is moving and upstream from the electrogalvanizing step (11), with an ultraviolet curable coating, and curing the coating (8) while the strip is moving prior to introduction to the electrogalvanizing step (11).
摘要:
A process and electrolyte for forming mound-free coatings of zinc-iron alloy on metal, e.g. steel, sheet and strip comprises passing the article to be plated through an electrolyte bath containing chlorides of iron and zinc and from about 2 to about 6 g/l, and particularly about 2.5 to about 3.5 g/l, of citric acid.
摘要:
Un support amortisseur de coulée (18) s'utilise dans un entonnoir de coulée (10) pendant la coulée continue en séquences. Le support amortisseur de coulée (18) comporte une pluralité de nervures primaires concentriques (23, 24) adjacentes au lieu d'impact d'un jet de coulée émanant d'une poche. Ces nervures sont d'une hauteur comprise dans une plage permettant de créer des poches de recirculation de manière à dissiper les turbulences sans déviation du métal en fusion par rapport à son écoulement radial vers l'extérieur le long du support amortisseur. L'écartement radial entre les crêtes primaires adjacentes, mesuré entre les surfaces marginales intérieures supérieures au niveau des points radiaux correspondants, est d'au moins 2 fois la hauteur de l'intérieur des crêtes primaires adjacentes.
摘要:
Un mortier de haute résistance a été mis au point pour être utilisé avec de la brique de silice dans la construction des parois de chauffe d'un four à coke. Lorsqu'il est porté à des températures conventionnelles d'un four à coke, de l'ordre de 1100°C, le mortier développe une résistance intrinsèque à la traction, et une liaison avec la brique de silice résistante à la traction, qui dépasse la résistance à la traction de la brique de silice. Le mortier se compose de trois constituants solides principaux: 25 à 88 % de SiO2, 6 à 65 % de Al2O3 et 4 à 12 % de P2O5. Pour obtenir une résistance à la traction aussi élevée, les autres constituants solides doivent être maintenus à un pourcentage minimum, de préférence inférieur à 4 % et mieux encore moins de 2 %.
摘要:
A method is provided for measuring and controlling the level of an elevated temperature liquid in a container. The method includes converting electrical voltage signals from temperature sensing means spaced along a wall of the container to digital form. The converted signals are periodically scanned in elevation sequence. From the scanned signals the location is determined of the uppermost sensing means having a signal value of sufficient magnitude to lie below the liquid level. A fraction, F, of the spacing between that sensing means and the next above sensing means is calculated at which the measured liquid level lies. The fraction determined is a function of the converted signal value, Sn-1, a converted signal value, Se, at an estimated location of the liquid level and, So, a converted signal value sufficient to cause the fraction, F, to be at or near zero in value immediately prior to imminent changes in the location of the uppermost sensing means determined to lie below the liquid level.
摘要:
A desulfurization composition contains from about 3 % to about 20 % particulate metallic aluminum, about 5 % to about 30 % particulate alumina, about 0.5 % to about 12 % particulate hydrocarbon material or other gas generating composition and the balance lime plus impurities. Preferably aluminum dross is the source of aluminum and alumina. The desulfurization composition is injected into molten iron from a blast furnace preferably in an amount of 0.7 to 7.5 kilograms desulfurizer per ton (907.2 kg.) of hot metal. The desulfurizing composition can be injected as a blend or co-injected into the hot metal through a lance using a carrier gas or dumped into the hot metal as it is being poured into the ladle. At least for torpedo ladles, the desulfurization composition can be placed in the ladle before the hot metal is poured into it.
摘要:
A method for desulfurizing molten steel while the steel is subjected to a vaccum dehydrogenation treatment, comprising adding to the steel in a vacuum chamber a desulfurizing agent in lump form and comprising, by weight percent, about 50 % CaO, about 38 % CaF2, and about 10 % MgO.
摘要:
An apparatus for use in a radial cell-type electrodeposition cell having a radial cathodic conductor roll (18) with a central conductor band for improving the transfer of electric current between the to-be-plated strip and the conductor band. The apparatus includes a holddown roll (44) which contacts the strip proximate the contact point of the strip and the conductor roll prior to the entry of the strip into the electrolyte bath and a second holddown roll which contacts the strip after the strip has exited from the electrolyte bath. The holddown rolls urge the strip uniformly against the conductor band to improve current transfer to the strip.