Yes. While you do have a right to strike and cannot be fired for striking, you can be replaced.
In addition, if you engage in an economic strike, you would generally become an “economic striker.”
As an economic striker, your employer is legally allowed to hire a permanent replacement to fill your job.
As/if you and/or the union call off the strike, you are not entitled to your job back until a vacancy occurs.
Instead, you would be placed on a preferential rehire list and may return to work only when an opening occurs.