2B Surface 201CR Stainless Steel Sheets

2B Surface 201CR stainless steel sheet is an austenitic chromium-nickel-manganese stainless alloy. It was developed mid century to conserve nickel and it is used as an alternative to type 301CR stainless steel sheet in some tempered applications. Because of 201’s relatively high yield strength in the annealed condition, use of 201 is limited. SS 201CR sheet is generally used in the tempered condition particularly for springs and fasteners. 201CR stainless will retain a comparable ductility to 301 even with the higher yield strength.

2B Surface 201CR Stainless Steel Sheet Chemical Composition 

1) AOD (Low carbon, high nickel) J1 material: Ni: 1.0-1.5%, Cu:0.8-1.0%, Cr:>13.5%, Mn:9-11%, C:<0.1%
2) AOD (Low carbon, high nickel) J3 material: Ni: 1.0-1.5%, Cu:0.5-0.8%, Cr:>12%, Mn:9-11%, C:<0.12%
3) Induction (High carbon, low nickel) material: Ni: 0.6-0.9%, Cu:0.6-0.8%, Cr:>13.0%, Mn:9-11%, C:>0.12%

Why is 2B Surface 201CR Stainless Steel Sheets Corrosion Resistant? 

Corrosion is a natural phenomenon. Pure elements always react with the surrounding environment, which is why so few elements are naturally found in their pure form. Iron is no exception.
In wet or humid conditions, iron reacts with the oxygen contained in water to form iron oxide, also known as rust. The red flaky oxide deteriorates easily—exposing more material to corrosion. Iron and standard carbon steels are highly susceptible to this type of corrosion. Stainless steel has the innate ability to form a passive layer that prevents corrosion. What’s the secret?
Chromium!
The chromium found in all stainless steels reacts quickly with oxygen environments, much the same as iron. The difference, however, is that only a very fine layer of chromium will oxidize (often only a few molecules in thickness). Unlike flaky and unstable iron oxide, chromium oxide is highly durable and non-reactive. It adheres to stainless steel surfaces and won’t transfer or react further with other materials. It is also self-renewing—if it’s removed or damaged, more chromium will react with oxygen to replenish the barrier. The higher the chromium content, the faster the barrier repairs itself.
Once oxidized, or passivized, stainless steel typically rusts at a very low rate of less than 0.002 inches per year. When kept in its best condition, stainless steel offers clean and bright surfaces ideal for many building and landscape designs.
 

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