〣304 stainless steel and other models of the main difference

Difference between 201 and 304

1, commonly used stainless steel plate is divided into 201 and 304 two kinds of steel, the actual composition is different, 304 quality is better, but the price is expensive, 201 poor some.

2. 201 consists of 17Cr-4.5Ni-6Mn-N, which is a Ni-section steel and a substitute for 301 steel. Magnetic after cold working, used for railway rolling stock.

3. 304 consists of 18Cr-9Ni, which is the most widely used stainless steel and heat-resistant steel. Used in food production equipment, Xitong chemical equipment, nuclear energy, etc.

4. 201 has high manganese content, bright surface with dark brightness, and high manganese content is easy to rust. 304 contains more chromium, the surface is matte, no rust. Put the two together and you have a comparison. The most important thing is that the corrosion resistance is different. The corrosion resistance of 201 is very poor, so the price is much cheaper. And because of the low nickel content of 201, so the price is lower than 304, so the corrosion resistance is not as good as 304.

5, the difference between 201 and 304 is the nickel problem. And the price of 304 is relatively expensive, generally close to 20000 a ton, but 304 can at least ensure that it will not rust in the process of use. (Potion can be used for experiment)

6, stainless steel is not easy to rust because the formation of chrome-rich oxide on the surface of the steel body can protect the steel body,201 material belongs to high manganese stainless steel is higher than 304 hardness, high carbon and low nickel.

7, the composition is different (mainly from carbon, manganese, nickel, Chromium containing several aspects to distinguish 201 and 304 stainless steel) steel number carbon (C) silicon (Si) manganese (Mn) phosphorus (P) sulfur (S) chromium (Cr) nickel (Ni) molybdenum rod (Mo) copper (Cu)AISI(304) ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.03 18-20 8-10 AISI(201) ≤0.15 ≤1.00 5.5-7.5 ≤0.05 ≤0.03 16-18 3.5-5.5

In terms of fatigue resistance, 201 hardness, toughness is not as good as 304, or 304 fatigue resistance is better.

Difference between 316 and 304

The two most commonly used stainless steel 304,316 (or corresponding to German/European standard 1.4308,1.4408), the main difference between 316 and 304 in the chemical composition is that 316 contains Mo, and it is generally recognized that 316 corrosion resistance is better, than 304 in high temperature environment more corrosion resistance. Therefore, in a high temperature environment, engineers generally choose parts made of 316 materials. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, then high temperature do not use 316! Or this is gonna be a big deal. Anyone who studies mechanics has studied thread, and remember molybdenum disulfide (MoS2), a dark solid lubricant that is applied to prevent thread death at high temperatures, from which two conclusions can be drawn. [1]Mo is indeed a high-temperature substance. (Do you know what crucible gold is melted with? Molybdenum crucible!) . [2] : Molybdenum readily reacts with high sulfur ions to form sulfide. So no stainless steel is super resistant to corrosion. In the end, stainless steel is a piece of impurities (but these impurities can be more corrosion resistant than steel ^^) more steel, steel can react with other substances.

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