Manufacture of a composite tubular product
AssigneeVallourec
InventorsMichel Douchy, Jean-Louis Tranchant, Michel Jehan
Life of this patent
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Abstract
For the purpose of introducing an additive into a molten metal bath, a reactive powder is enclosed in a tubular sleeve composed of a metal compatible with the bath. The cross-section of the sleeve is reduced after filling to compact the powder while leaving it porous. The filled sleeve can be formed by profiling a metal strip to a cup-shaped cross-section, metering the powder into the cup-shaped profile, closing the edges of the strip together to enclose the powder, forming the edges to hook together and crimping the hooked edges.
Claims13
Process for the manufacture of a composite tubular product comprising the steps of:
- (a) filling a tubular envelope with a powder capable of aggregation;
- and
- (b) reducing the cross-section of the filled tubular envelope while keeping its circumference substantially constant;
- (c) whereby said powder is compacted n situ while being safely retained within said tubular product.
Composite tubular product comprising a closed profiled tubular envelope filled with an aggregated powder having a flattened cross section.
Dependencies are inferred from the claim text.