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Method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy process

A technology of powder metallurgy and corrosion-resistant alloys, which is applied in the field of powder metallurgy to prepare wear-resistant and corrosion-resistant alloy pipe fittings, which can solve the problems of increased overall cost of alloys, adverse effects of alloy properties, segregation of alloy elements, etc., to prevent the rise of oxygen content in molten steel , reduce production costs, and accelerate the effect of floating and removing

Inactive Publication Date: 2017-10-10
ADVANCED TECHNOLOGY & MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, alloys for tools and molds are mainly prepared by traditional casting and forging processes. The liquid alloy is slowly cooled and solidified during the pouring process. The alloy components are prone to segregation during the solidification process and form coarse structures. Even after subsequent forging and rolling, this bad structure will still be formed. Alloy properties have adverse effects, resulting in low levels of alloy properties including strength, toughness, wear resistance, and grindability
The powder metallurgy process is used to prepare alloys to solve the problem of alloy element segregation. The prepared alloy structure is fine and uniform. Compared with cast and forged alloys, the performance is greatly improved, but the powder preparation cost is high, which increases the overall cost of the alloy. How to reduce powder metallurgy? The cost of alloy preparation process is a problem that needs to be solved

Method used

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  • Method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy process
  • Method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy process

Examples

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Embodiment 1

[0033] This embodiment relates to a method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy, including the following preparation steps:

[0034] Step 1. Prepare a powder of iron-based alloy with wear-resistant and corrosion-resistant properties. The mass percentage of the chemical composition of the alloy is C: 2.68%; W: 0.5%; Mo: 1.3%; Cr: 16.5%; V: 8.3%; Nb: 2.0%; Co: 0.2%; Si: 0.6%; Mn: 0.3%; N: 0.12%; O: 0.006%; the balance is iron and impurities. The alloy powder is prepared by non-vacuum powder metallurgy process, and the powder metallurgy process steps are as follows:

[0035] a. Transfer the molten steel to the ladle, and the loading weight of the molten steel is 3 tons;

[0036] b. The upper surface of the molten steel in the ladle is covered with ladle mold slag, and the ladle mold slag is heated to maintain the superheat of the molten steel at 110°C; nitrogen gas is introduced at the bottom of the ladle to stir the molte...

Embodiment 2

[0044] This embodiment relates to a method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy, including the following preparation steps:

[0045] Step 1. Prepare a powder of iron-based alloy with wear-resistant and corrosion-resistant properties. The mass percentage of the chemical composition of the alloy is calculated as C: 2.08%; W: 0.5%; Mo: 1.5%; Cr: 16.5%; V: 4.6%; Nb: 1.8%; Co: 0.3%; Si: 0.6%; Mn: 0.5%; N: 0.08%; O: 0.006%; the balance is iron and impurities. The alloy powder is prepared by non-vacuum powder metallurgy process, and the powder metallurgy process steps are as follows:

[0046] a. The molten steel is transferred to the ladle, and the loading weight of the molten steel is 5 tons;

[0047] b. The upper surface of the molten steel in the ladle is covered with ladle mold slag, and the ladle mold slag is heated to maintain the superheat of the molten steel at 150°C; argon gas is introduced at the bottom of the ladle ...

Embodiment 3

[0055] This embodiment relates to a method for preparing wear-resistant and corrosion-resistant alloy pipe fittings by powder metallurgy, including the following preparation steps:

[0056] Step 1. Prepare a powder of iron-based alloy with wear-resistant and corrosion-resistant properties. The mass percentage of the chemical composition of the alloy is calculated as C: 2.1%; W: 0.5%; Mo: 1.5%; Cr: 22.0%; V: 4.0%; Nb: 1.0%; Co: 0.2%; Si: 0.8%; Mn: 0.4%; N: 0.05%; O: 0.008%; the balance is iron and impurities. The alloy powder is prepared by non-vacuum powder metallurgy process, and the powder metallurgy process steps are as follows:

[0057] a. Transfer the molten steel to the ladle, and the loading weight of the molten steel is 7 tons;

[0058] b. The upper surface of the molten steel in the ladle is covered with ladle mold slag, and the ladle mold slag is heated to maintain the superheat of the molten steel at 135°C; nitrogen gas is introduced at the bottom of the ladle to s...

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Abstract

The invention relates to an anti-abrasion anti-etching alloy tube production method through a powder metallurgy process. Iron base alloy powder with anti-abrasion anti-etching performance characteristics and inner carbon steel or stainless steel alloy are subjected to hot isostatic pressing encapsulation combination to be formed into anti-abrasion anti-etching alloy tubes. The produced alloy tube tissue structure is completely compact, and two layers of alloy are integrated tightly, accordingly, the requirement of application work conditions for anti-abrasion anti-etching performances is met, the use amount of high-cost alloy powder is reduced, the production cost is reduced, and the product market competitiveness is improved. The method is simple to operate, easy to control and provided with wide application markets.

Description

technical field [0001] The invention relates to a method for preparing an alloy pipe fitting, in particular to a method for preparing a wear-resistant and corrosion-resistant alloy pipe fitting by a powder metallurgy process. Background technique [0002] Under some special working conditions, the surface of tools, molds or mechanical parts is not only subjected to direct contact with hard abrasive particles in moving parts or working media to cause wear, but also to be corroded by moisture, acid or other corrosive agents, such as in injection molding machinery. Screws, screw sleeves and other parts, on the one hand, due to the addition of a large number of hard particles in the plastic, such as glass fiber, carbon fiber, etc., the wear of these parts is increased, and on the other hand, the corrosive components in the plastic will chemically corrode the parts. In order to make the parts used in these special working conditions have a long service life, the surface of the al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B22F5/12B22F7/06
Inventor 李小明吴立志况春江王学兵匡星
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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