ing' target='_blank'>cast iron
is through get spheroidal graphite spheroidization and inoculation, effectively improve the mechanical properties of cast iron, especially improve the plasticity and toughness, and the strength is higher than carbon steel.
Small make up today to tell you something about spheroidizing treatment of nodular cast iron
Ductile iron pieces in spheroidizing treatment method has a lot of kinds, into method is widely used at home and abroad spheroidizing treatment.
Processing package is usually used by the dam type spheroidized package.
In order to reduce the degree of reaction between liquid iron and magnesium and magnesium volatilization rate of vapor, into the method usually used magnesium content in low alloy nodularizer.
Spheroidizing, first of all, the spheroidizing agent into the dam side, covered ferrosilicon alloy, compact, and then covered with no rust iron, steel or other coating agent.
When spheroidized, should as far as possible will iron liquid into the other side of the iron liquid package at a time.
A magnesium absorption into general is 30% ~ 50%.
In order to improve the balling effect, can improve the processing package height and diameter ratio;
With low magnesium nodulizing agent;
A reasonable dose of iron liquid temperature, and the cover.
Into method has the advantage of handling and simple equipment, easy to operate, has greater flexibility in production, the technology needed to content is low, but the deficiency is the spheroidizing process micron, smoke and dust pollution is serious;
Magnesium absorption rate is low.
And there's a subcontract method, the method using pure magnesium as nodularizer, suitable for processing high sulfur content of liquid iron, can make the impurities such as magnesium sulphate, magnesium silicate with iron liquid separation well, magnesium and iron liquid reaction is not very intense, less liquid iron and cooling, the use of safe, magnesium absorption rate can reach 60% ~ 80%.
Before specific technological process is spheroidized will subcontract lies, quantitative iron liquid injection, and then add the nodularizer reaction chamber, lock tightly closed device, and cover the package cover.
Then turn the metal liquid package should be standing, then iron liquid through the small hole on the reaction chamber into the reaction chamber, the flow velocity and the area of the holes and the static pressure of iron liquid package.
Magnesium heated vaporization, formed in the reaction chamber of magnesium vapor pressure, when pressure exceeds iron liquid static pressure in the package, iron liquid suspension into the latent heat of vaporization of magnesium reaction indoor temperature drop;
Vapor pressure drops, iron liquid into the reaction chamber again, this kind of automatic adjustment function can make magnesium more smoothly with iron liquid reaction.
Subcontract method spheroidizing process also generate large micron and smoke, and subcontracting reaction chamber inside holes is easy to be iron or slag blockage, clean up and maintain the size of the pores more troublesome, the spheroidizing method is difficult to continuous processing liquid iron.
Above is the spheroidizing of nodular cast iron, hope can help to you.
Today small make up to you at this point, let's see you next time.
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