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Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof

A production method and technology for wear-resistant pipes are applied in the field of metal casting and can solve the problems of high melting point slag, low shear strength, inclusion and slag inclusion, etc.

Inactive Publication Date: 2010-07-14
HANDAN XINXING SPECIAL TUBING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wear-resistant pipe produced by this method, because the coating is sprayed with water-based graphite paint, is likely to cause carburization of the outer layer of molten steel, and the increase in the carbon content of the outer layer will reduce the toughness of the product and affect the quality of the product; at the same time, due to the casting process Mold slag is not used to protect pouring. The high melting point slag produced in the steelmaking process is difficult to float up, and it is easy to produce inclusions and slag inclusions. Complete metallurgical bonding cannot be achieved, and the shear strength is low.

Method used

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  • Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof
  • Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof
  • Bimetallic metallurgical composite wear-resisting tube blank and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 (tube blank specification Φ617[outer diameter]×Φ589[medial diameter]×Φ563[inner diameter]×3100mm)

[0021] (1) After the metal pipe mold 1 is baked to 270°C, the water-based zirconium powder coating is sprayed with a thickness of 2.4 mm; the composition of the water-based zirconium powder coating should satisfy (ratio by weight): (zirconium) English powder: polyaluminum chloride: bentonite: water: active agent [washing powder or sodium sulfonate] = 100: 5-8: 12-15: 50: 0.5-0.8)

[0022] (2) After spraying, bake the metal pipe mold to 280°C and centrifugally pour the outer metal liquid. The pouring weight is 710kg, and the pouring temperature is 1610°C. Melting point mold flux, the composition of low melting point mold flux is (in percent by weight): CaO: 34.1%; SiO 2 : 29.8%; Al 2 o 3 : 2.51%; CaF 2 : 7.94%; Na2O: 14.57%; MgO: 2.51%; BaO: 8.57%;

[0023] (3) When the temperature of the inner surface of the outer layer is cooled to 50-60°C lower than the m...

Embodiment 2

[0024] Example 2 (tube blank specification Φ617[outer diameter]×Φ571[middle diameter]×Φ537[inner diameter]×3100mm)

[0025] (1) After baking the metal pipe mold to 285°C, spray water-based zircon powder coating with a thickness of 2.1 mm; the composition of water-based zircon powder coating should satisfy (ratio by weight): (zircon powder: polyaluminum chloride: bentonite: water: active agent [washing powder or sodium sulfonate]=100:5-8:12-15:50:0.5-0.8).

[0026] (2) After spraying, bake the metal pipe mold to 295°C and centrifugally pour the outer metal liquid. The pouring weight is 1036kg, and the pouring temperature is 1587°C. Melting point mold flux, low melting point mold flux consists of (weight percentage): CaO: 34.1%; SiO 2 : 29.8%; Al 2 O3: 2.51%; CaF 2 : 7.94%; Na 2 O: 14.57%; MgO: 2.51%; BaO: 8.57%.

[0027] (3) When the temperature of the inner surface of the outer layer is cooled to 110-120°C lower than the melting point of the outer layer of molten metal, s...

Embodiment 3

[0028] Example 3 (tube blank specification Φ222[outer diameter]×Φ193[medial diameter]×Φ184[inner diameter]×2100mm)

[0029] (1) After baking the metal pipe mold to 280°C, spray water-based zircon powder coating with a thickness of 1.3 mm; the composition of water-based zircon powder coating should satisfy (ratio by weight): (zircon powder: polyaluminum chloride: bentonite: water: active agent [washing powder or sodium sulfonate]=100:5-8:12-15:50:0.5-0.8).

[0030](2) After spraying, bake the metal pipe mold to 310°C and centrifugally pour the outer metal liquid. The pouring weight is 230kg, and the pouring temperature is 1644°C. Cool after pouring. Melting point mold flux, low melting point mold flux consists of (weight percentage): CaO: 34.1%; SiO 2 : 29.8%; Al 2 o 3 : 2.51%; CaF2: 7.94%; Na 2 O: 14.57%; MgO: 2.51%; BaO: 8.57%.

[0031] (3) When the temperature of the inner surface of the outer layer is cooled to 50-60°C lower than the melting point of the outer layer of...

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Abstract

The invention discloses a method for manufacturing a bimetallic metallurgical composite wear-resisting tube blank, which comprises the following steps: firstly, spraying a water-based zircon powder coating onto a metal tube die after being baked to between 200 and 300 DEG C, wherein the spraying thickness is 1.0 to 3.0mm; secondly, centrifugally casting external liquid metal on the metal tube die after being baked to between 200 and 350 DEG C, cooling the metal tube die after casting, beginning to cast internal liquid metal into the metal tube die when an internal surface temperature of the outer layer is cooled to a temperature lower than a solidus temperature of the external metal; and finally, pouring the internal liquid metal into the metal tube die for centrifugal casting, cooling the metal tube die after casting, and stopping cooling when the outer layer and the inner layer are completely solidified, then the outer layer and the inner layer are metallurgically fused completely, wherein the outer layer is made of a plain carbon steel material or a low-alloy high-strength steel material and the inner layer is made of a high-chromium white cast iron material. The invention also discloses the bimetallic metallurgical composite wear-resisting tube blank manufactured by the method. The outer-layer metal and the inner-layer metal of the tube blank manufactured by the method can be metallurgically fused completely; the qualification rate is improved; and the use safety is high.

Description

technical field [0001] The invention relates to the field of metal casting and molding, in particular to a bimetallic metallurgical composite wear-resistant tube blank and a production method thereof. Background technique [0002] X / high chromium white cast iron bimetallic composite pipes are mainly used in mining industries such as coal mines, gold mines, copper mines, iron ores, phosphate mines, and potassium sulfate mines, as well as pipes for conveying solid materials. Among them, X refers to ordinary carbon steel or low-alloy high-strength steel materials, such as 14MnV, 16MnV; high-chromium white cast iron is wear-resistant white cast iron alloy materials (such as KmTBCr20Mo2Cu1, KmTBCr26 and other steel grades in GB8263-87), according to the use Depending on the requirements, its composition can be adjusted appropriately. This material is generally used for wearing parts in mining, metallurgy, electric power, building materials and machinery industries. At present, t...

Claims

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Application Information

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IPC IPC(8): B22D19/08B22D13/02
Inventor 王黎晖申勇陈建波高杰宋亚峰霍川喜
Owner HANDAN XINXING SPECIAL TUBING CO LTD
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