Loading patent…
AssigneeThyssen Stahl AG
InventorsHans Pircher, Rudolf Kawalla, Gerd Sussek, Walter Wilms, Waldemar Wolpert
Estimating the term…
The invention comprises a process for the production of clad hot rolled strip. A steel slab as base material is cladded with a layer material of a corrosion-resistnt material. The slab is of a low-alloy steel having a carbon content of up to 0.25% by weight, the layer material preferably is stainless, more particularly a stainless austenitic steel or a wrought alloy on a nickel basis. The steel slab and the layer material are connected by explosive cladding, the resulting composite body being heated to rolling temperature and is subsequently rolled down to one quarter of the initial thickness with a high reduction of pass of phi greater than 0.10 and then rolled to final thickness of the hot rolled strip. The finish rolling temperature is in the range of 900.degree. C. The clad hot rolled strip is subjected to a cooling rate in the core of at least 8.degree. C./s to a cooling temperature of below 650.degree. C. After cooling to this temperature range the clad hot rolled strip is coiled and cooled to room temperature.
A process for the production of a clad hot rolled strip, comprising (a) cladding a steel slab as a base material with a corrosion-resistant cladding material as a layer material by explosive cladding, (b) heating the resulting composite body from (a) to a rolling temperature, (c) hot-rolling the composite body from (b) to a final thickness of the hot rolled strip with a high reduction of pass in one operation in a hot strip mill, (d) rapidly cooling the resulting hot rolled strip from a finish rolling temperature to a cooling temperature and (e) coiling the cooled strip.
A product produced by the method according to any of the preceding claims wherein the steel slab (basic material) having a carbon content of up to 0.25% by weight, the layer material being stainless steel, an austenitic stainless steel or a wrought alloy on nickel basis.
Dependencies are inferred from the claim text.