Are enterprises in the world replace their solder to the lead (Pb) free solder from the lead (Pb) solder?
Regrettably, all lead (Pb) solder in the world is not replaced to lead (Pb) free solder.
There are various reasons why enterprises are not completely their solder from the lead (Pb) solder to the lead (Pb) free solder.
Typical reasons are as follows.

Still there is a country which can sell the product which used the lead (Pb) solder.

Because the lead (Pb) free solder is the new material than the lead (Pb) solder, it can not declare that the lead (Pb) free solder can be used in any product.

In strictly consideration of safety for life of the person, there is uneasiness in use the lead (Pb) free solder which is the new material than the lead (Pb) solder.

Some of technical poin_pt of lead (Pb) solder is superior to the lead (Pb) free solder.

The lead (Pb) solder is cheaper than the lead (Pb) free solder.

Since it has been a common sense that the electric product is manufactured on condition that apply the lead (Pb) solder　for these electric product, it is not easily replace to the lead (Pb) free solder from the lead (Pb) solder at present.

Even then, enterprises who replace to the lead (Pb) free solder from the lead (Pb) solder have been increasing little by little to reduce the lead (Pb) solder.
Furthermore, there is enterprise and a laboratory that are researching and developing new lead (Pb) free solder.
In the future,
It is probably in the future, the lead (Pb) free solder will be used for almost products.