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Device and method for producing workpieces with surfaces consisting of rust-resistant metal

A technology for workpieces, non-ferrous metals, applied in the field of devices for performing the method, to achieve the effect of low manufacturing and simple cost

Inactive Publication Date: 2011-12-28
ANDRITZ HYDRO GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In different workpieces, the geometry increases the difficulty of coating by spraying

Method used

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  • Device and method for producing workpieces with surfaces consisting of rust-resistant metal
  • Device and method for producing workpieces with surfaces consisting of rust-resistant metal
  • Device and method for producing workpieces with surfaces consisting of rust-resistant metal

Examples

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Effect test

example 1

[0025] After preheating to 220° C., a turbine blade made of G20Mn5 QT was immersed in a molten steel made of GX4 CrNi 13-4QT at a temperature of 1550° C. A layer thickness of 8.2 mm (measured at the center of the plate) was obtained after an immersion time of 10 seconds. Here, the layer thickness at the edge was 3.5 mm. In order to have a uniform layer thickness of 5 mm, the turbine blade was dipped again. Subsequently, the surface is ground, whereby the desired shape, layer thickness and surface quality are obtained. Milling is also necessary in some cases.

example 2

[0027] Turbine blades made of G24Mn6 QT were dipped after preheating to 500° C. into a molten steel made of GX5 CrNiMo 19-11-2 at a temperature of 1500° C. By preheating, the immersion time can be extended without risk up to 20 seconds. Here, the desired minimum layer thickness of 5 mm has already been reached after one immersion. Subsequently, the surface is likewise ground in order to ensure the necessary quality.

[0028] The present invention is not limited to these examples. Instead, it can be applied to different types of workpieces, such as rotating bodies, worm extrusion shafts, etc. The molten steel used for the cladding can also consist of other materials, for example GX 4 CrNiMo 16-5-1, GX 2 CrNi 19-10 or similar steel types. The workpiece can also consist of other raw materials, wherein the same ASME or ASTM material can likewise be used both for the immersion melt and for the workpiece.

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Abstract

The invention relates to a method for producing a workpiece with a surface made of a rust-resistant material. According to the invention, a workpiece 4 of unalloyed steel is cast and subsequently immersed in a melt 2 of a liquid rust-resistant material and covered with a layer of rust-resistant material. The invention also relates to a device comprising a crucible 1 and a lifting mechanism 3 and for carrying out the method according to the invention.

Description

technical field [0001] The invention relates to a method for producing workpieces with surfaces made of rust-resistant metal. Furthermore, the invention also relates to a device for carrying out the method. Background technique [0002] To date, various workpieces made of pure stainless steel have been cast in order to have corresponding surfaces. Such workpieces are becoming more and more expensive due to the alloying components, in particular for high-quality cast steel, and the rising prices of raw materials such as copper and zinc. When casting the workpiece, the steel is heated in the crucible to such an extent that the steel is liquid and also has the desired composition by adding different alloy components. Subsequently, the crucible with the liquid steel melt is pivoted to such an extent that the steel can be cast into the prepared shape. Undesirable air inclusions and slag inclusions can occur during casting. In different workpieces, the geometry increases the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/00C23C2/04
CPCC23C2/003C23C2/04C23C2/00322
Inventor 海因茨·潘霍尔策
Owner ANDRITZ HYDRO GMBH
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