how do a brand new boiler can be magnatised or pasivted explain me indetail?

Question

what kind of chemicals used for such process also the operating conditions required

Answer 1

Stainless steel and some other mettle are passivated.

Depending on the mettle different chemicals are used , I am not including them as most are extremely harm full and Toxic, deadly in small quantity. The factories that do this type of work keep the processes secret,and proprietary , the factories are in remote parsley populated areas and have special equipments to monitor air , discharge water........They also need to have evacuation plan for the people of the area, in case of any contingencies.

You may find it on Internet but please do not try even in small quantity.

Lots of things containing certain mettle get magnetised over the period of time due to earths magnetic field, it is called induce magnetism. If you have a pen it gets magnetised after some times in your pocket, by just being their, but has to have certain mettle(steel that can be induced).