Device and method for manufacturing metal clad plates in way of continuous casting and rolling

Abstract

The device and method for manufacturing metal clad plates in way of continuous casting and rolling provided by the present invention, combines the continuous casting, rolling and heat treatment methods used for single material production with the continuous and large-scale production method of composite strip, greatly improves the production efficiency of composite plates. The present invention can be used for producing single-sided or double-sided composite plates with different thickness specifications, wherein the base material or the composited material can be selected in a wide range, including carbon steel, stainless steel, special alloy steel, titanium, copper and the like. The invention realizes the production of composite plates by continuous casting and rolling, and reduces energy consumption and costs.

Claims

1. A device for manufacturing metal clad plates in way of continuous casting and rolling, the device comprising first and second base material supplying equipment lines each including an uncoiler, a pinch roller, a shot blasting machine, a welding equipment, a welding pinch roller, an induction heating apparatus, and a guiding roller; wherein, a first base material strip (A) is transported through the uncoiler, the pinch roller, the shot blasting machine, the welding equipment, the welding pinch roller, the induction heating apparatus and the guiding roller of the first base material supplying equipment line; a second base material strip is transported through the uncoiler, the pinch roller, the shot blasting machine, the welding equipment, the welding pinch roller, the induction heating apparatus and the guiding roller of the second base material supplying equipment line, the first and second material strips are transported to a mould where the first and second base material strips and a molten steel are merged; the first and second base material strips enter the mould from above and pass through from below along inner walls of two sides of the mould, wherein the inner walls of two sides of the mould being sealed with side seal plates; a tundish for casting the molten steel is provided above the mould; the molten steel flows from the tundish into the mould and comes into contact with the first and second base material strips in the mould, so that a preliminary melt merging takes place; after the preliminary melt merging, the first and second base material strips (A) form composite slabs (B) and pass through the mould from below, and are cooled at a secondary cooling section with a cooling-spray located at an outlet of a lower part of the mould; a ski pass roll is provided after the secondary cooling section, and after the ski pass roll provided is a rolling mill for making composite slabs into composite strips (C) with a designed different size and specification; an on-line cooling equipment for the composite strips is provided after the rolling mill, a leveler is provided at an exit of the on-line cooling equipment; and the composite strips levelled by the leveler are then cut to a desired fixed length by a cut-to-length shear or coiled by a coiler.

2. A process for manufacturing metal clad plates in way of continuous casting and rolling, the method comprising: transporting a first base material strip through an uncoiler, a pinch roller, a shot blasting machine, a welding equipment, a welding pinch roller, an induction heating apparatus, and a guiding roller of a first base material supplying equipment line; transporting a second base material strip through an uncoiler, a pinch roller, a shot blasting machine, a welding equipment, a welding pinch roller, an induction heating apparatus and a guiding roller of a second base material supplying equipment line; transporting the first and second base material strips to a mould where the first and second base material strips and a molten steel are merged, wherein the first and second base material strips enter into the mould from above and pass through from below along inner walls of two sides of the mould, the inner walls of two sides of the mould are sealed with side seal plates, a tundish for casting the molten step is provided above the mould, the molten steel flows from the tundish into the mould and comes into with the first and second base material strips in the mould, that a preliminary melt merging takes place, and, after the preliminary melt merging, the first and second base material strips form composite slabs and pass through the mould from below; cooling the composite slabs at a secondary cooling section with a cooling-spray located at an outlet of a lower part of the mould; leveling the composite slabs by a ski pass roll provided after the secondary cooling section; forwarding the composite slabs into a rolling mill provided after the secondary cooling section and rolling the composite slabs into composite strips with a designed different size and specification; cooling the composite strips at an on-line cooling equipment provided after the rolling mill; leveling the composite strips at a leveler provided at an exist of the on-line cooling equipment; and cutting the composite strips to a desired fixed length by a cut-to-length shear or coiling the composite strips by a coiler.

3. The device of claim 1, wherein the first base material strip is transported through the uncoiler, the pinch roller, the shot blasting machine, the welding equipment, the welding pinch roller, the induction heating apparatus and the guiding roller of the first base material supplying equipment line in that sequential order, and the second base material strip is transported through the uncoiler, the pinch roller, the shot blasting machine, the welding equipment, the welding pinch roller, the induction heating apparatus and the guiding roller of the second base material supplying equipment line in that sequential order.

4. The device of claim 1, wherein the induction heating apparatus is filled with an atmosphere comprising nitrogen.

5. The device of claim 1, wherein the molten steel flows from the tundish into the mould with argon blowing on a surface of the molten steel.

Description

FIGURE DESCRIPTION

(1) FIG. 1 shows a diagram of the device of a device and method for manufacturing metal clad plates in way of continuous casting and rolling according to the present invention.

(2) 1—uncoiler, 2—pinch roller, 3—shot blasting machine, 4—welding equipment, 5—welding pinch roller, 6—induction heating apparatus, 7—guiding roller, 8—mould, 9—tundish, 10—secondary cooling section, 11—ski pass roll, 12—rolling mill, 13—on-line cooling equipment, 14—leveler, 15—cut-to-length shear, 16—coiler, A—base material strip, B—composite slab, C—composite strip.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(3) In the following, with reference to the drawings and embodiments, a device and method for manufacturing metal clad plates in way of continuous casting and rolling provided by the present invention will be further described.

Example 1 Double-Sided Composite Plate

(4) 1) Uncoiling 20 mm thick 316L stainless steel strip used as cover layer with uncoiler and sending it to shot blasting machine where its surface will be cleaned through pinch roller. The shot blasted 316L stainless steel strip enters into welding equipment, the tail of the previous roll of the 316L stainless steel strip and the head of the next roll of the 316L stainless steel strip are welded, so the 316L stainless steel strip used as cover layer material will be continuous supplied; 2) The welded 316L stainless steel strip used as cover layer is transported to induction heating apparatus to be heated through welding pinch roller, wherein the induction heating apparatus is filled with nitrogen for protection, the heating temperature is 850° C., the heating speed is 10° C./s; 3) The heated 316L stainless steel used as cover layer passes through the mould along the inner wall of the wide side of the mould at a speed of 3 m/min via guiding roller. The distance of the wide side of the mould is 300 mm Molten Q235B carbon steel is poured from the tundish into the mould through a nozzle, the pouring temperature is 1610° C. The surface of the mould is blown with argon to reduce the oxidation of molten steel. Molten Q235B carbon steel contacts with the surface of the 316L stainless steel, causing slightly melt on the surface of the 316L stainless steel, so as to form a preliminary melt merging between the cover layer and the base layer. Thus, the double-sided composite slab with the Q235B carbon steel as the base layer and the 316L stainless steel as the cover layer is formed, and its thickness is 300 mm (20+260+20 mm); 4) The double-sided composite slab formed in the mould passes through the mould and enters into secondary cooling section, where cooling water is sprayed on the upper and lower surfaces of the composite slab to further solidify the incompletely solidified composite slab, meanwhile rapid cooling prevents the crystal grains generated by surface solidification from growing and coarsening; 5) The cooled composite slab is transported to rolling mill at 1120° C. to be rolled into a double-sided composite plate with a thickness of 30 mm (2+26+2 mm), and the final rolling temperature is 1000° C. The rolled composite plate is cooled on-line, the start cooling temperature is 950° C., the final cooling temperature is 540° C., and the cooling rate is 25° C./s; 6) The cooled composite strip is transported to leveler for leveling, and the leveled composite strip is cut to fixed length by a cut-to-length shear.

Example 2 Single-Sided Composite Plate

(5) 1) A 30 mm thick 304 stainless steel strip used as the cover layer is transported to shot blasting machine where its surface will be cleaned through pinch roller. The shot blasted 304 stainless steel strip enters into welding equipment, the tail of the previous roll of the 304 stainless steel strip and the head of the next roll of the 304 stainless steel strip are welded, so the 304 stainless steel strip used as cover layer will be continuous supplied; 2) The welded 304 stainless steel strip used as cover layer is transported to induction heating apparatus to be heated through welding pinch roller, wherein the induction heating apparatus is filled with nitrogen for protection, the heating temperature is 750° C., the heating speed is 8° C./s; 3) The heated 304 stainless steel used as cover layer passes through the mould along the inner wall of the wide side of the mould at a speed of 1.5 m/min via guiding roller. The distance of the wide side of the mould is 280 mm Molten AH36 carbon steel is poured from the tundish into the mould through a nozzle, the pouring temperature is 1600° C. The surface of the mould is blown with argon to reduce the oxidation of molten steel. The molten steel is gradually solidified under the cooling effect of the cool steel strip used as the cover layer, the wide side and the narrow side of the mould. Molten AH36 carbon steel contacts with the surface of the 304 stainless steel, causing slightly melt on the surface of the 304 stainless steel, so as to form a preliminary melt merging between the cover layer and the base layer. Thus, the single-sided composite slab with the AH36 carbon steel as the base layer and the 304 stainless steel as the cover layer is formed, and its thickness is 280 mm (30+250 mm); 4) The single-sided composite slab formed in the mould passes through the mould and enters into secondary cooling section, where cooling water is sprayed on the upper and lower surfaces of the composite slab to further solidify the incompletely solidified composite slab, meanwhile rapid cooling prevents the crystal grains generated by surface solidification from growing and coarsening; 5) The cooled composite slab is transported to rolling mill at 1050° C. to be rolled into a single-sided composite plate with a thickness of 14 mm (1.5+12.5 mm), and the final rolling temperature is 980° C. The rolled composite plate is cooled on-line, the start cooling temperature is 920° C., the final cooling temperature is 400° C., and the cooling rate is 30° C./s; 6) The cooled composite strip is transported to leveler for leveling, and the leveled composite strip is cut to fixed length by a cut-to-length shear.

(6) The device and method for manufacturing metal clad plates in way of continuous casting and rolling provided by the present invention, combines the continuous casting, rolling and heat treatment methods used for single material production with the continuous and large-scale production method of composite strip, greatly improves the production efficiency of composite plates. The present invention can be used for producing single-sided or double-sided composite plates with different thickness specifications, wherein the base material or the composited material can be selected in a wide range, including carbon steel, stainless steel, special alloy steel, titanium, copper and the like. The invention realizes the production of composite plates by continuous casting and rolling, and reduces energy consumption and costs.