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Method for manufacturing tubular or annular cobalt-based casting alloy resistant to abrasion, heat and corrosion

A technology for cobalt-based alloys and casting alloys, which is used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of low density of casting alloys, low mass production efficiency and high cost

Active Publication Date: 2012-12-26
HEBEI WUWEI AERO & POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low mass production efficiency, high cost, low density of casting alloy and coarse crystal grains in the prior art of sand casting itself.

Method used

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  • Method for manufacturing tubular or annular cobalt-based casting alloy resistant to abrasion, heat and corrosion
  • Method for manufacturing tubular or annular cobalt-based casting alloy resistant to abrasion, heat and corrosion
  • Method for manufacturing tubular or annular cobalt-based casting alloy resistant to abrasion, heat and corrosion

Examples

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Embodiment 1

[0019] Example 1: Using centrifugal casting process to prepare cobalt-based alloy pipe fittings with an inner diameter of Φ40mm, a wall thickness of 3mm, and a length of 4000mm to make a cobalt-based alloy sleeve

[0020] First, the alloy is smelted in a non-vacuum induction furnace according to the alloy composition required in Table 3, using slag protection, and the slag composition is shown in Table 4. While smelting the alloy, spray paint inside the mold cylinder. The mold cylinder is made of ZG45Ni35Cr26 heat-resistant steel castings. The thickness of the cylinder is 25mm, the inner diameter is 50mm, and the length is 4500mm. The coating formula is shown in Table 5, and the coating thickness is 0.7mm. After the completion of the preheating, the cylinder is preheated. The preheating adopts the method of heating the outer wall of gas, and the preheating temperature is 370℃. Transfer the uniformly smelted cobalt-based alloy to the ladle and move it to the centrifugal casting ma...

Embodiment 2

[0021] Example 2: Preparation of cobalt-based alloy pipe fittings with an inner diameter of Φ800mm, a wall thickness of 20mm, and a length of 500mm to make a cobalt-based alloy sealing ring

[0022] The alloying elements in Table 3 were smelted in a non-vacuum induction furnace with slag protection. The slag composition is shown in Table 4. While smelting the alloy, spray the paint inside the mold barrel. The mold barrel is made of ZG45Ni35Cr26 heat-resistant steel castings. The barrel thickness is 30mm and the inner diameter is 845mm. The coating formula is shown in Table 5. The coating thickness is 1mm. The cylinder is preheated, and the preheating adopts the heating method of the gas outer wall, and the preheating temperature is 420℃. Transfer the uniformly smelted cobalt-based alloy to the ladle and move it to the centrifugal casting machine for centrifugal casting. During centrifugal casting, the rotating speed of the mold cylinder is 1000 rpm, the cobalt-based alloy tempera...

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Abstract

The invention discloses a method for manufacturing tubular or annular cobalt-based casting alloy parts resistant to abrasion, heat and corrosion, belonging to the field of metal materials. In the invention, a mold cylinder centrifugal casting method is adopted for manufacturing the tubular or annular cobalt-based casting alloy parts, and by controlling the temperature, rotation speed and designed paint ingredients for centrifugal casting, the cobalt-based alloy with fine grains, high density, high performance and resistance to abrasion, heat and corrosion can be obtained. The method comprises the steps of: spraying paint with the thickness of 0.5-1mm on the inner wall of a mold cylinder before pouring, and preheating, wherein the preheating temperature of the mold cylinder is 350-450 DEG C and the rotation speed of the mold cylinder is controlled to be 800-1000 turns / minute; and pouring after the mold cylinder rotates at a stable speed, wherein the pouring temperature of molten cobalt-based alloy is 1600-1700 DEG C, and the pouring speed is bound to be controlled within the range of 5-8kg / s. According to the invention, a cobalt-based alloy pipe as long as several meters can be manufactured in one step without isostatic pressing treatment in a later period, and a pipe can be cut out from the manufactured cobalt-based alloy pipe according to actual length requirement, so that the production efficiency is improved and the production cost decreased.

Description

Technical field [0001] The invention belongs to the field of manufacturing cobalt-based alloys, and invents a method for manufacturing pipe or ring wear-resistant, heat-resistant and corrosion-resistant cobalt-based casting alloys. Background technique [0002] Cobalt-based alloy has high high temperature strength, high temperature fatigue resistance, thermal shock resistance, good oxidation resistance, corrosion resistance, high wear resistance and good resistance to intermetallic wear at 650~1100℃ . Widely used in the manufacture of various parts under industrial and mining conditions such as wear resistance, corrosion resistance, high temperature resistance and impact resistance, such as seal rings, guide sleeves and piston rings in ultra-supercritical steam turbines, aviation jet engines, industrial gas turbines, etc. , Guide vanes and nozzle guide vanes in ship gas turbines and diesel engine nozzles. Cobalt-based alloys are classified into cast cobalt-based superalloys, de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/10B22C3/00B22D21/06B22D27/04
Inventor 祁进坤任淑彬赵刚周勇寇晓磊
Owner HEBEI WUWEI AERO & POWER TECH