DE1483588A1 - Blow-off or flow-pack pipes - Google Patents

Description

KLÖÖKNER-WERKE SHARES & ESELLSCHASO}

Duisburg

Blow stowage or flow stowage pipes

The present invention relates to blow or blow pack pipes.

Such pipes are subject to very severe wear the inside. This is done by lining the inner surface of the pipes with cast basalts and other inorganic substances tried to avoid.

It is to improve the properties of the aforementioned pipes also known, blow-off or flow displacement pipes made of double pipes manufacture, the inner tube made of a relatively hard wear-resistant Steel and the outer tube is made of a common bulk steel. You already have pipes of the one in question Type made of two-layer metal sheets that were connected by means of a plating process and also various Provide steel grades for the two layers. Another known method is to attach one type of steel to a second type of steel to be poured on and the composite structure thus obtained to be rolled out to form a sheet, which is processed into a pipe.

The pipes made of several types of steel also have serious ones Disadvantage. As wear progresses, there are signs of separation between the two types of steel that are used for Lead shearing of inner wall parts, which cause a blockage of the pipe. In particular, those according to the well-known Process manufactured composite pipes very sensitive to hardening processes.

The invention avoids the disadvantages of the known composite pipe in that a mixing or connecting zone is provided between the two types of steel by means of a composite casting process in which there is a continuous transition from one type of steel to the other. According to a preferred embodiment

909810/0566 BATH ORIGINAL

U83588

embodiment of the invention is the 'thickness of the mixed or j connection zone 1-20%, preferably 3-10% of the total wall thickness of the pipe.

\ A further preferred embodiment of the invention "is that the composite casting system operates with a separating plate, is defined by a soft mixing chamber. By means of such process, the mixing zone thickness can be very finely adjusted and adapted to the given circumstances.

A special production method of the invention is based on a sheet metal produced from a composite cast raw block, the composite cast raw block being produced by casting the composite casting partners on both sides of a partition system. t

The present invention is explained with reference to the figures.

]? ig. 1 illustrates the casting of a composite cast ingot, from which a sheet metal can be rolled out for the production of a pipe according to the invention,

S * ig. 2 shows a welding from such a sheet metal by means of a spiral or the like. Manufactured pipe.

The reference number 1 illustrates the casting plate with the casting channels 2 and 3. In the mold 4, the two metal sheets 5 are used as a uniform partition system. The sheets are provided with a perforation (not shown) so that the two types of steel 8 and 9 can flow through the perforation into the mixing zone 10 between the two sheets 5. The inventive ratio of 1% to 20% of the mixed zone thickness to ^; The total thickness of the pipe is already specified in the ingot, the ratio of the two thicknesses is given by the distances 6 and 7, with the reference numeral 7 defining the thickness of the raw slab, which is rolled into a sheet that is used for composite pipe production is, while with the reference numeral 6 the thickness'. ι the mixing zone, ie the distance between the two sheets 5 for connection • is anschaulicht. ,

-3-909810 / 0566 BATH ₀

Figure 2 illustrates a cross section through an inventive Composite pipe. With the reference numerals 11 and 12 are the "two Steel grades with the reference number 13 indicated the mixing zone. the Reference number 14- indicates the total wall thickness of the pipe and the Reference number 15 indicates the thickness of the mixing zone.

Expectations

909810/056 6 M; ^

Claims (2)

Claims 1683588 1. Composite pipe consisting of an outer rail made of relatively soft steel and a wear-resistant inner layer made of relatively hard steel, characterized in that between the two types of steel (11, 12) a continuous transition region (13) produced by a composite casting process from one type of steel to the other type of steel is provided. 2. Composite pipe according to claim 1, characterized in that the transition region (13) has a thickness which is between 1 - 20%, preferably 3 - 10% of the total wall thickness of the pipe. 3. Process for the production of a composite pipe according to claim 1 or 2, characterized in that a composite cast slab is cast in a chill mold, a partition plate system with a mixing chamber is used in v / eicher and the width of the mixing chamber is chosen so that the Slab to a sheet, the thickness of the mixing or connecting zone between the two types of steel is 1-20%, preferably 3-10% of the total thickness of the sheet, and that the sheet thus rolled is further processed into a tube by a method known per se . BAD ORiQiNAL 909810/0566 • '-.-. ^ - Jr *. ν. 4.9.1967Ϊ