440 Stainless. However, a good weapon will never use stainless steel.
Most if not all countries make their own stainless steel.
Most reactive to what? There are dozens, probably hundreds, of grades of both steel and stainless steel, the reactivity of all of which will vary considerably depending on the chemical environment.
Most kitchen knives are made of stainless steel however knives can also be made of carbon steel, and other steel alloys.
Some of the most effective stainless steel cleaners include baking soda and vinegar as active ingredients. There are many name brand items available to clean stainless steel.
The most common use for stainless steel bolts is to hold parts together. You may find stainless steel bolts in use on such common household features as plumbing, woodworking and more.
Stainless steel refrigerators are usually quite expensive, often the most expensive. However, a good place to find stainless steel appliances is a company that sells directly from the manufacturer. For example, http://www.number1direct.com
Most people purchase stainless steel for the look, not for the safety. One con of stainless steel is that is does show fingerprints and dirt. But when clean it looks amazing!
China
most are made from stainless steel
The finish. Most people prefer stainless with a high shine (polished) finish. Satin has a dull finish to it (unpolished)
Stainless steel is made in most developed countries and many developing countries. It tends to be made in metal foundries.
A steel is considered to be stainless if it contains a minimal of 13% chromium.