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What makes stainless steel stainless?
Stainless steel is an iron based metal with at least 10.5% chromium added. It is the 10.5% chromium that makes it stainless. The chromium reacts with the oxygen in the air to form a thin protective layer of chromium oxide that prevents oxygen from rusting the surface. Higher levels of chromium and the addition of other alloys such as nickel and molybdenum enhance this protective layer and improve the corrosion resistance of the stainless material.

What causes rust?
Iron reacting with oxygen causes rust.

Can stainless steel rust?
Stainless steel does not "rust" as long as the protective layer of chromium oxide is able to form on the surface. Any contamination of the surface by dirt or other material hinders the formation of the protective layer and traps corrosive agents, reducing the corrosion protection and resulting in rust.

What are the most common causes of stainless steel rusting or corroding?
Improper cleaning of your stainless steel is the most common cause. This could include not removing all the dirt from your stainless steel, not thoroughly rinsing your stainless steel after washing, leaving some soap behind, and not thoroughly drying your stainless steel, allowing the iron in your water to react with the oxygen in the air leaving spots behind. In the last instance, it is your water that is rusty not your stainless steel. The best way to avoid rust or corrosion problems is to follow the Cleaning Instructions under the Product Care section.

Another cause of rust or corrosion could be that some iron particles have contaminated the surface of your stainless steel by scouring it with steel wool. It is these iron particles from the steel wool that are rusting not your stainless steel. Chlorides, which include a wide range of products from chlorine detergents to salt, can also have a corrosive effect on stainless steel. The addition of molybdenum to all the knives we sell helps our knives resist corrosion to chlorides, but care should still be taken to thoroughly rinse any chlorides from your stainless steel as soon as is conveniently possible.

What is the best way to remove rust or corrosion from your stainless steel?
Any of the numerous household stainless steel cleaners available on the market can be used to remove rust from your stainless steel. It is recommended that you visit your local kitchen shop to find one that is specifically produced for kitchen products.

What are the three categories of stainless steel used for making kitchen products?
The three categories of stainless steel used in making kitchen products are austenitic, ferritic and martensitic. Austenitic is non-magnetic and cannot be hardened by heat treatment. It contains nickel and little or no carbon. Austenitic is the most rust resistant of all stainless steels. 18-8 and 18-10 stainless steel are both austenitic. Ferritic is magnetic, but cannot be hardened by heat treatment. Ferritic is often called low carbon stainless steel. Martensitic is magnetic and can be heat treated to high hardness levels. Martensitic is called high carbon stainless steel. All your professional quality knives are made of martensitic stainless steel.

How do I sharpen my Kasumi ceramic knives?
You should always have your Kasumi ceramic knives professionally sharpened.

If I want to have my Global, Kasumi or Bunmei knives professionally sharpened where should I send them?
Send your knives to:

Charles Robertson
909 Kiwi Lane
Wilmington, NC 28412
(516) 978-4773


Michael Soleagui
Perfect Edge Cutlery
1640 Palm Avenue
San Mateo, CA 94402
(650) 349-2665


Eytan Zias
Phoenix Knife House
7607 E McDowell Road #118
Scottsdale, AZ 85257
(480) 946-2758

What should I do if I break my Global ceramic sharpening rod (G-45)?
If you should break your Global ceramic sharpening rod, you can purchase a replacement at your local authorized Global retailer.

Are replacement ceramic wheels available for the MinoSharp and MinoSharp Plus sharpeners?
Yes. Replacement ceramic wheels can be purchased at your local MinoSharp authorized retailer.

How do I make a warranty claim?
Go to Warranty Information, download the warranty claim form and follow the instructions.

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