How to choose Stainless steel flatware and cookware?14/1, 21/0, 18/0, 18/8, 18/10, 301, 302, 304, and 316 are used to fabricate flatware and cookware. Different grades determine level of shine and prevention against corrosion.
Type 18 is old classification of stainless steel. American Iron and Steel Institute (AISI) developed 300 series designation, now used for all steel products. It gives a tighter control over the quality of stainless steel being used. Type 304 is the most common grade (the classic 18/8) used in fabricating cookware and flatware. Type 316 is the second most popular grade, the classic 18/10. Type 316 is better than 18/10 against corrosion.
Type 440 is used to make cutlery knives
Role of CarbonCarbon is needed in iron to make iron into steel. Carbon up to 0.65% makes steel harden-able. Durability can be increased by adding up to 1.5% Carbon. Beyond 1.5%, the Carbon reduces the toughness and makes it brittle,
Role of ChromiumChromium increases hardness penetration, toughness, and wear resistance. The most important effect on steel is to resist staining and corrosion. When the steel contains 10.5% or more Chromium, the surface reacts to the oxygen in the air forming Chromium oxide. Chromium oxide prevents the 'staining' (rusting) of the iron alloy, leading to the name stainless steel. If you scratch the surface, the oxygen in the air forms new chromium oxide surface. Higher the amount of Chromium, thicker is the protective surface and coated quicker by Chromium oxide after it has been scratched and exposed to air.
Role of NickelThe stainless steel may corrode due to acids and salts. Nickel is added to prevent the corrosion and pitting. It hardens the steel, and adds whiteness to render polishing (shiny) characteristics. Higher the amount of Nickel, harder and shinier is the stainless steel, as well as the price.
Grades of Stainless steel Flatware and Cookware- Economy grade Kitchenware in India is made with low carbon 14/1 (Chromium: 14%, Nickel: 1%) stainless steel
- Economy grade 21/0 is used to make economy flatware. It is comparable to classic 18/0. Neither 21/0, nor 18/0 has any Nickel.
- There are three classic standard grades of stainless steel sold in United States:
18/0: Chromium: 18%, No Nickel.
18/8: Chromium: 18%, Nickel: 8%. This is the most common stainless steel used worldwide
18/10: Chromium: 18%, Nickel: 10%. This is the most common 'high quality' grade
- The 300 series is modern standard with a slightly tighter margins. Type 304 is the most common stainless steel used in the world similar to classic 18/8 stainless steel. Therefore, other stainless steel are compared against Type 304
Type 304: Carbon: 0.08% max, Chromium:18% to 20% , Nickel: 8% to 10.5%
304 is the most common stainless steel
produced, similar to classic 18/8 stainless steel. It is durable, resists most of the chemicals and
withstands ordinary corrosion. Slightly magnetic.
Type 440 Cutlery Knife steel
This is used to fabricate cutlery knives such as chef's knife or paring knife, daggers (Chhuri,or Kirpan), and swords.
It contains 12% to 14% Chromium sufficient enough to make it corrosion resistant. Corrosion resistance is
achieved when it is hardened and surface ground and polished. It has better corrosion resistance, and tougher than
304. Higher amount of carbon provides better edge retention when properly heat-treated. 440A has the lowest amount of
carbon, 440 B average amount of carbon, and 440 C is high carbon. Low carbon stainless steel knives (440A) are
hard to sharpen at home, however they are most strain-resistant. High carbon stainless steel (440C) knives are the
strongest and can be sharpened at home.
Is one grade heavier than the other grade?
Chromium Nickel and Iron are basically same weight density. The weight for the same geometry is same for all
the grades of the Stainless steel. Physically larger pieces are heavier than the smaller pieces. Choose
flatware or cookware that feels heavier.
All 18/10 stainless steel is not sameUnfortunately, the federal laws permit labeling of stainless steel as 18/10, as long as the Nickel is at least 8.3%. Comparing it with 18/8, there is not much of a difference. You have to really compare the two products side by side and compare. Type 304 and Type 316 have better Nickel content. Stick with brand names
14/1, 21/0,18/0, 18/8, 18/10, 301, 302, 304,316, 316L are all acceptable.
|Google Group | Disclaimer | What do you think!|