A production method of pure magnesium plate

Abstract

The present invention provides a production method of pure magnesium plate, comprising the following steps: (1) spraying a protective film on the surface of a magnesium plate blank, which is a molybdenum layer, a titanium layer and a refractory layer containing 55%-70% alumina from the inside to the outside; (2) heating the blank in a continuous heating furnace, the heating temperature is 180-220°C, and the heating time is 0.8-1.2 min / mm; (3) rolling is performed in a cold rolling mode, the blank thickness after rough rolling is between 40-50 mm, the pass reduction during fine rolling is 10-15 mm, and all cooling water is turned off during the rolling process; (4) after rolling, straightening is performed using a cold straightening machine, and then cutting is performed while soaking in kerosene. The method of the present invention can realize continuous batch production of magnesium plates, and the produced magnesium plates have good plate shape and surface quality.

Description

Technical Field

[0001] The invention relates to a production method of a pure magnesium plate and belongs to the field of material processing. Background Art

[0002] The uses of magnesium metal are mainly concentrated in the production of magnesium alloys, reduction of other precious metals and corrosion protection. For example, magnesium sacrificial anodes are widely used in corrosion protection of oil pipelines, natural gas, coal gas pipelines and storage tanks, smelters, gas stations, as well as water heaters, heat exchangers, evaporators, boilers and other equipment.

[0003] At present, magnesium is mainly manufactured by powder method, shaft furnace reduction method and other methods, but it is rarely involved in the field of rolling. It is mostly used as a raw material to combine with other alloys to produce magnesium alloys. As a pure magnesium plate (containing more than 99.9% Mg), it is very active and not suitable for storage. It can react in the air and water, and it is rarely used for rolling production. Summary of the invention

[0004] The object of the present invention is to provide a production method of pure magnesium plates, which can realize continuous batch production of magnesium plates, and the produced magnesium plates have good plate shape and surface quality.

[0005] To achieve the above object, the technical solution provided by the present invention is:

[0006] A method for producing a pure magnesium plate comprises the following steps:

[0007] (1) A protective film is sprayed on the surface of the magnesium plate blank, which is composed of a molybdenum layer, a titanium layer and a refractory layer containing 55%-70% alumina from the inside to the outside;

[0008] (2) The billet is heated and rolled in a continuous heating furnace at a temperature of 180-220°C and a heating time of 0.8-1.2 min / mm;

[0009] (3) Cold rolling is adopted for rolling. The thickness of the billet after rough rolling is between 40-50 mm. The pass reduction during finishing rolling is 10-15 mm. All cooling water is turned off during the rolling process.

[0010] (4) After rolling, the steel is straightened using a cold straightening machine and then cut by immersion in kerosene.

[0011] In step (1) of the present invention, the thickness of the molybdenum layer is 1-3 mm, the thickness of the titanium layer is 0.5-1 mm, and the thickness of the refractory layer is 1-2 mm.

[0012] In step (1) of the present invention, the molybdenum layer is sprayed with 100% purity molybdenum powder, and the titanium layer is sprayed with 100% titanium powder; the particle size of the molybdenum powder and the titanium powder is 80-100 mesh.

[0013] The roughness of the molybdenum layer and the titanium layer in step (1) of the present invention is between 0.5 and 0.8 um.

[0014] In step (1) of the present invention, 2-5% silica gel is contained between the molybdenum layer and the titanium layer to facilitate bonding.

[0015] In the heating process of step (2) of the present invention, the flow ratio of air to gas in the heating furnace is controlled to be 20-30:1.

[0016] The magnesium plate blank in step (1) of the present invention has a thickness of 100-120 mm, and no cracks exist on the surface of the magnesium blank.

[0017] The technical solution of the present invention has the following beneficial technical effects:

[0018] (1) Spraying a protective film on the surface of the magnesium plate blank can prevent the pure magnesium plate from reacting with air, water and other substances during heating, rolling and storage.

[0019] (2) The technical solution provided by the present invention can realize the continuous batch production of magnesium plates. The produced magnesium plates have good plate shape, no surface defects, and unevenness ≤ 5 mm / m.

[0020] (3) The technical solution provided by the present invention can realize the rolling of magnesium plates with a thickness of 8-20 mm and a width of 2000-2800 mm. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described in detail below through specific embodiments.

[0022] Example 1

[0023] The production method of 8mm thick×2000mm wide pure magnesium plate comprises the following steps:

[0024] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 1mm molybdenum layer, a 0.5mm titanium layer and a 1mm thick refractory layer containing 55% alumina from the inside to the outside; there is 2% silica gel between the molybdenum layer and the titanium layer. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 80 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 80 mesh. The roughness of the molybdenum layer and the titanium layer after spraying is 0.5um.

[0025] (2) A pure magnesium billet with a thickness of 100 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 20:1; after the magnesium billet enters the furnace, it is quickly heated to 180°C, and the holding time is 0.8 min / mm.

[0026] (3) Cold rolling mode is adopted for rolling. The rough rolling billet is rolled to 40 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 10 mm. All cooling water is turned off during the rolling process.

[0027] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0028] The pure magnesium plate produced in this implementation has a width of 2000 mm, good surface quality, correct rectangularity, and an unevenness of 4.5 mm / m.

[0029] Example 2

[0030] The production method of 12mm thick×2300mm wide pure magnesium plate comprises the following steps:

[0031] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 1.2mm molybdenum layer, a 0.65mm titanium layer and a 1.2mm thick refractory layer containing 63% alumina from the inside to the outside. There is 2.5% silica gel between the molybdenum layer and the titanium layer for easy bonding. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 90 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 90 mesh. The roughness of the sprayed layer and the titanium layer is 0.65um.

[0032] (2) A pure magnesium billet with a thickness of 110 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 23:1; after the magnesium billet enters the furnace, the temperature is quickly raised to 190°C, and the holding time is 0.95 min / mm.

[0033] (3) Cold rolling mode is adopted for rolling. The rough rolling slab is rolled to 45 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 12 mm. All cooling water is turned off during the rolling process.

[0034] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0035] The pure magnesium plate produced in this implementation has a width of 2300 mm, good surface quality, good rectangularity, and an unevenness of 3.5 mm / m.

[0036] Example 3

[0037] The production method of 15mm thick × 2600mm wide pure magnesium plate comprises the following steps:

[0038] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 1.2mm molybdenum layer, a 0.8mm titanium layer and a 1.5mm thick refractory layer containing 65% alumina from the inside to the outside. There is 3.8% silica gel between the molybdenum layer and the titanium layer for easy bonding. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 90 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 90 mesh. The roughness of the molybdenum layer and the titanium layer after spraying is 0.7um.

[0039] (2) A pure magnesium billet with a thickness of 110 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 27:1; after the magnesium billet enters the furnace, it is quickly heated to 190°C, and the insulation time is 1 min / mm.

[0040] (3) Cold rolling mode is adopted for rolling. The rough rolling billet is rolled to 50 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 13 mm. All cooling water is turned off during the rolling process.

[0041] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0042] The pure magnesium plate produced in this implementation has a width of 2600 mm, good surface quality, correct rectangularity, and an unevenness of 4 mm / m.

[0043] Example 4

[0044] The production method of 15mm thick×2700mm wide pure magnesium plate comprises the following steps:

[0045] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 2mm molybdenum layer, a 0.7mm titanium layer and a 1.7mm thick refractory layer containing 65% alumina from the inside to the outside. There is 3.8% silica gel between the molybdenum layer and the titanium layer for easy bonding. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 95 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 95 mesh. The roughness of the molybdenum layer and the titanium layer after spraying is 0.65um.

[0046] (2) A pure magnesium billet with a thickness of 120 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 28:1; after the magnesium billet enters the furnace, it is quickly heated to 200°C, and the holding time is 1.0 min / mm.

[0047] (3) Cold rolling mode is adopted for rolling. The rough rolling billet is rolled to 50 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 13 mm. All cooling water is turned off during the rolling process.

[0048] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0049] The pure magnesium plate produced in this implementation has a width of 2700 mm, good surface quality, correct rectangularity, and an unevenness of 5 mm / m.

[0050] Example 5

[0051] The production method of 18mm thick×2300mm wide pure magnesium plate comprises the following steps:

[0052] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 2.6mm molybdenum layer, a 0.75mm titanium layer and a 1.9mm thick refractory layer containing 70% alumina from the inside to the outside. There is 4.2% silica gel between the molybdenum layer and the titanium layer for easy bonding. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 95 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 95 mesh. The roughness of the molybdenum layer and the titanium layer after spraying is 0.75um.

[0053] (2) A pure magnesium billet with a thickness of 120 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 28:1; after the magnesium billet enters the furnace, it is quickly heated to 200°C, and the holding time is 1.1 min / mm.

[0054] (3) Cold rolling mode is adopted for rolling. The rough rolling billet is rolled to 50 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 13 mm. All cooling water is turned off during the rolling process.

[0055] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0056] The pure magnesium plate produced in this implementation has a width of 2300 mm, good surface quality, correct rectangularity, and an unevenness of 2 mm / m.

[0057] Example 6

[0058] The production method of 20mm thick × 2800mm wide pure magnesium plate comprises the following steps:

[0059] (1) The protective film is sprayed on the surface of the magnesium plate blank, which is composed of a 3mm molybdenum layer, a 1mm titanium layer and a 2mm thick refractory layer containing 70% alumina from the inside to the outside. There is 5% silica gel between the molybdenum layer and the titanium layer for easy bonding. The molybdenum layer is sprayed with 100% pure molybdenum powder with a particle size of 100 mesh, and the titanium layer is sprayed with 100% pure titanium powder with a particle size of 100 mesh. The roughness of the molybdenum layer and the titanium layer after spraying is 0.8um.

[0060] (2) A pure magnesium billet with a thickness of 120 mm is sent from a roller table to a continuous furnace, and the flow ratio of the heating gas in the heating furnace is controlled, wherein the flow ratio of air to gas is 30:1; after the magnesium billet enters the furnace, the temperature is quickly raised to 220°C, and the holding time is 1.2 min / mm.

[0061] (3) Cold rolling mode is adopted for rolling. The rough rolling billet is rolled to 50 mm and sent to the finishing mill. During the finishing rolling, the pass is pressed down by 15 mm. All cooling water is turned off during the rolling process.

[0062] (4) After rolling, the steel is straightened using a cold straightening machine and then cut in a wood cutting machine soaked in kerosene.

[0063] The pure magnesium plate produced in this implementation has a width of 1800 mm, good surface quality, good rectangularity, and an unevenness of 4.5 mm / m.

Claims

1. A method for producing a pure magnesium plate, characterized in that: The following steps are involved: (1) A protective film is sprayed on the surface of the magnesium plate blank, which is composed of a molybdenum layer, a titanium layer and a refractory layer containing 55%-70% alumina from the inside to the outside; (2) The blank is heated in a continuous heating furnace at a temperature of 180-220°C and a heating time of 0.8-1.2 min / mm; (3) Cold rolling is adopted for rolling. The thickness of the billet after rough rolling is between 40-50 mm. The pass reduction during finishing rolling is 10-15 mm. All cooling water is turned off during the rolling process. (4) After rolling, the steel is straightened by a cold straightening machine and then cut by immersion in kerosene; In step (1), the thickness of the molybdenum layer is 1-3 mm, the thickness of the titanium layer is 0.5-1 mm, and the thickness of the refractory layer is 1-2 mm; In step (1), the molybdenum layer is sprayed with 100% pure molybdenum powder, and the titanium layer is sprayed with 100% titanium powder; The roughness of the molybdenum layer and the titanium layer in step (1) is between 0.5 and 0.8 μm; In step (1), 2-5% silica gel is contained between the molybdenum layer and the titanium layer.

2. The method for producing a pure magnesium plate according to claim 1, characterized in that: The particle size of the molybdenum powder and titanium powder is 80-100 mesh.

3. The method for producing a pure magnesium plate according to claim 1, characterized in that: In step (2), the flow ratio of air to gas in the heating furnace is controlled to be 20 to 30:

1.

4. The method for producing a pure magnesium plate according to claim 1, characterized in that: The magnesium plate blank in step (1) has a thickness of 100-120 mm, and no cracks exist on the surface of the magnesium plate blank.