SU585033A1 - Method of making bimetallic packages - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular to the production of bimetals.

There is a known method of making packages, including preparing the surface of the base and cladding metals, making the frame, laying the frame and blanks of the cladding layer between the blanks of the base layer, welding the blanks of the base layer to frame l.

However, it is difficult to obtain double-layer sheets with a base layer of stainless steel and cladding carbon steel because of the complexity of the package welding and the low strength of welds during rolling, as it is necessary to weld stainless steel of a stainless steel layer with a carbon or stainless steel frame. In addition, a high flow rate (| fiiiyent (2.2-2.5) on stainless steel.

There is also known a method for producing a two-layer steel with a base layer of stainless steel and carbon-coated plating, when a plating coating is welded to the base layer billet.

rolled metal, and then a two-layer billet is rolled onto sheets of the desired size 2.

The disadvantage of this method is the difficulty of the rolling process due to the shuffling of the bimetallic billet and the low surface quality of the plating layer.

The purpose of the invention is to obtain high-quality two-layer sheets with a base layer of stainless steel, and cladding carbonaceous with a low metal consumption.

This is achieved by preforming the blanks of the cladding layer (carbon steel) with the base layer (stainless steel and steel), and then the two-layer blanks are folded inward with the cladding layer with the preliminary application of a layer of separating plaster and coated with carbon wall stitching.

The cladding of the preform of the base layer can be carried out by any known method, for example, explosion welding.

The preferred method was tested under industrial conditions.

For the base layer, use a slab of Grade grade / 12X18H1OT with dimensions 115 "1250x1900 mm", for a cladding layer plate made of 20K grade steel with dimensions 15x1350x21OO mm. Before welding, the stainless steel plates are planed, and carbon steel plates are etched and cleaned with metal rods. The welding of the plate to the slab is produced by explosion energy, for which the plate is set at an angle of 1 with respect to the slab. The minimum gap between the plate and SL bom-1O mm. Ammonite 6GV is used as an explosive substance. All charged yes 250 kg. Under the influence of the explosion energy, the plate is cut around the perimeter by the size of the slab.

The two cladding slabs of the ba are folded with a carbon layer to each other and scaled on carbon steel. For the pre-storage of carbon layers from welding between them, a separation coating consisting of an aqueous solution of magnesium sulphate and magnesite powder is applied to one of the contact surfaces. Pack-, you are heated in a methodical furnace to 12OO C (for metal) and rolled on the mill 28OO. After trimming the edges, sheets with dimensions of 25 15OO “5200 mm are obtained. Heat breaks are heat treated according to the mode: heating up to 920 ° C, exposure at the rate of 1, O –1.2.min / mm, cooling under the fan. The surface quality of the cladding layer is high. Sheets do not etch j.

Expense Ratio 1.6 t / t. The thickness of the cladding layer is 2.8 mm. Mechanical properties of bimetallic sheets: temporal resistance of mazgr.guu 56 kgf / mm, P1) yield strength 28 KIX: -MM, relative elongated 41%, shear resistance 28 kgf / mm. Steel 12X1 ail FROM slope, on to intergranular corrosion.

The proposed method allows to obtain high-quality two-layer sheets with a base layer of stainless steel and clad them with a layer of carbon steel. At the same time, the metal consumption is reduced to 1.5 -., 7 t / t as compared with the known method.

Claims (2)

1. Golovanenko S. A. Meandrov D.V. Bimetal production. M., Metallurgists, 1966, p. 172. 2. Meandrov D.V. Two-layer korroEIONT1O-resistant steels abroad. M., Metallurgists, 1970, p. 9-10.