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Carburization prevention coating for ultralow carbon stainless steel casting

An anti-carburizing coating and stainless steel technology, applied in the direction of coating, casting mold, casting mold composition, etc., can solve the problems of hydraulic turbine component failure, limited solubility, grain boundary corrosion, etc., achieve high refractoriness, high permeability, prevent The effect of sticky sand

Active Publication Date: 2013-06-05
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solubility of elements such as carbon, nitrogen and sulfur in solid stainless steel castings is very limited, and they are always precipitated along the grain boundaries in the form of carbides, resulting in the occurrence of grain boundary corrosion and premature failure of turbine components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An anti-carburization coating for ultra-low carbon stainless steel castings, which is composed of 50% refractory aggregate white corundum powder, 5% oxidant potassium nitrate or potassium permanganate, 8% sintering aid talc, organic binder rosin or resin 2 %, 2% bentonite suspending agent, 0.2% additive superfine aluminum silicate or titanium oxide and 32.8% ethanol solvent with a concentration of 95%.

Embodiment 2

[0027] An anti-carburizing coating for ultra-low carbon stainless steel castings, which is composed of 57% white corundum powder of refractory aggregate, 6% potassium dichromate oxidant, 3% sintering aid talcum powder, 1% organic binder rosin, and bentonite suspending agent 3%, 0.4% superfine aluminum silicate additive and 29.6% solvent isopropanol with a concentration of 98%.

Embodiment 3

[0029] An anti-carburizing coating for ultra-low carbon stainless steel castings, which is composed of refractory aggregate white corundum powder 50%, oxidant potassium chlorate 9%, sintering aid mica powder 6.8%, bentonite suspending agent 5%, additive titanium oxide 0.4% and concentration Prepared by mixing 28.8% of 95% ethanol solvent.

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Abstract

The invention discloses a carburization prevention coating for an ultralow carbon stainless steel casting. The carburization prevention coating is prepared by mixing 50 to 60 weight percent of white corundum powder, 5 to 10 percent of oxidant, 3 to 8 percent of sintering aid, 1 to 3 percent of organic binder, 2 to 5 percent of bentonite suspending agent, 0.2 to 0.4 percent of aid, and 28.8 to 38.2 percent of solvent; the granularity of the white corundum powder is less than or equal to 3 mu m, the granularity of the oxidant is less than or equal to 5 mu m, and the granularity of talcpowder isless than or equal to 5 mu m; the oxidant is one or more of potassium nitrate, potassium permanganate, potassium dichromate, and potassium chlorate; the sintering aid is one or more of talcpowder, feldspar powder, mica powder, and clay; and the organic binder is rosin or resin; and the solvent is ethanol or isopropanol, the concentration of ethanol is more than or equal to 95 percent, and the concentration of the isopropanol is more than or equal to 98 percent. The coating is poured into some ultralow carbon stainless steel castings of water turbine blades, and the thickness of a surface carburization layer of the ultralow carbon stainless steel casting on which the carburization prevention coating prepared according to the formula is poured is less than or equal to 3mm, and is obviously superior to that of the common coating.

Description

technical field [0001] The invention relates to a mold coating used in the production process of steel castings, in particular to an anti-carburization coating for ultra-low carbon stainless steel castings applied in the foundry industry and a preparation method thereof. Background technique [0002] The electric power industry is one of the important pillar industries of my country's national economic and social development. In my country's electricity installed structure, the proportion of coal power is as high as 70%, with high energy consumption and large pollutant emissions, while hydropower technology is the most mature, most competitive and environmentally friendly renewable energy that can be developed on a large scale. The development of hydropower is an important measure to achieve the goal of energy conservation and emission reduction and the goal of developing non-fossil energy, and has always been highly valued by countries all over the world. According to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 谭锐李汉锟李玲李世成王岩
Owner SHENYANG RES INST OF FOUNDRY