Well . I´ve been shipping internationally for about 30 years, with maybe 50 containers and another 70 machine tools on top of that, plus maybe 300 packages aka LTL (less than pallet) loads.
Get an industrial freight forwarder and it will be cheap and easy.
The normal ones will hugely overcharge You at the back end, since they can, when they have your goods at the receiving end and can charge whatever per day in storage fees.
DHL has an industrial arm dhl scs supply chain services.
Anyone like that.
For 600 kg, probably one pallet, you will probably pay 300$ ocean freight and 300-400 $ other fees until it is at your doorstep or truck, if near any major port via dhl scs.
The typical freight forwarders can and do tack on extra fees at the end, that you must pay to get your goods out of bonded storage.
The industrial freight forwarders don´t, their business is based on 98% repeat rate.
And they will happily sell anything to anyone, an individual is just a new client with possible entry to new future business.
They are all nice to deal with.
Again, based on dozens over 3 decades in 5 countries, at least.
Dhl scs or similar can and do typically quote a flat fee door to door, including all customs, duties whatever.
We shipped over 80 haas machines to me in Spain, 2000+ per year in europe, via dhl.
I shipped maybe 8000 PCs via ocean freight, when I was in my twenties.
A big 4000 kg VMC costs about 4k to get to europe from oxnard california and 1500 - 2.500 -4500$ to get to customer door anywhere in europe.
Shipping is dirt cheap.
I bought a Bridgeport M head as an individual, 150 kg (cost basis), and it was *air freight* to my door for 400$ US to barcelona.
My 450 kg industrial lathe was 150€ for 2500 km trucking, Chester UK to Barcelona at my door.