Could a Machine Magnetize Cast Iron Parts More Than Steel?

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SUMMARY

The discussion centers on the potential for a machining machine to magnetize cast iron parts more than steel parts due to the presence of DC currents in the drive motors. It is established that machining cast iron at temperatures around 770°C can lead to magnetization, while stainless steel's magnetization depends on nickel content. The participants emphasize the need to address the DC currents for safety and to determine their impact on the magnetization of cast iron components, which contain 2.1-4% carbon, making them susceptible to magnetization.

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  • Familiarity with DC electrical systems in industrial machinery
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sophiecentaur
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Does it seem reasonable that a machine which has, up until now, been used for machining steel parts without, apparently, leaving them magnetised could be causing low level magnetisation of the same parts when made of cast iron? There are some DC currents flowing in the machine, apparently but suspect that they've not been high enough to magnetise the steel bits.
 
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Could be.

Stainless steel does not magnetize (depending on Ni content).
If the process of machining cast iron happens around 770'C magnetization can occur.

Why are there DC currents flowing through the machine?
 
Lok said:
Could be.

Stainless steel does not magnetize (depending on Ni content).
If the process of machining cast iron happens around 770'C magnetization can occur.

Why are there DC currents flowing through the machine?

I don't think it gets this hot in this machine but I'll enquire.
This isn't stainless steel that I'm comparing it with.
The DC, I think, is in the drive motors. This is a huge machine making car engine parts but I only know of the problem second hand.
 
sophiecentaur said:
I don't think it gets this hot in this machine but I'll enquire.
This isn't stainless steel that I'm comparing it with.
The DC, I think, is in the drive motors. This is a huge machine making car engine parts but I only know of the problem second hand.

Machining is a very hot process at least where the metal is cut, that is why they use cooling liquid. What type of machining does it do?

Fix the DC (safety first) and then see if it Cast Iron gets magnetized. Cast Iron has 2.1-4% in carbon, so it is easily magnetized.
 

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