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How to distinguish between 202 stainless steel and 304 stainless steel.

Date:2023-07-11Tags:202 stainless steel,304 stainless steel,stainless steel plate,stainless steel tube,stainless steel manufacturer

Chemical composition of 202 stainless steel and 304 stainless steel

202 stainless steel is a kind of 200 series stainless steel, the chemical composition of iron, manganese, aluminum, sodium, carbon, lime, carbon dioxide, Australia, the density of 7.938 kg / cubic decimetre. 202 stainless steel nickel content is generally less than 4%, the manganese content of 8% or so, belongs to the low nickel and high manganese stainless steel. 202 stainless steel is often associated with 304 stainless steel, mainly because both belong to an austenitic structure. Austenitic structure, non-magnetic, the appearance of the difference is not very important, the most important difference is the content of the chemical element nickel, which caused the two in the performance and the price of the huge difference!

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The main difference between 202 stainless steel and 304 stainless steel

1. Material composition is different: 202 nickel content of about 4%, manganese content of about 8%, 304 nickel content of about 8%, containing more than 18% of chromium. 2. corrosion resistance is different: 304 stainless steel in the chromium content is greater than 202, corrosion resistance is better than 202. 3, the application range is different: 304 is mainly used in food processing, storage and transportation, medical appliances, household goods, automotive parts, bellows, etc., 202 is used in building and construction. 202 is used in building decoration, public facilities, municipal engineering, highway guardrail, shopping malls, glass handrail, etc.. Due to the difference in nickel content, resulting in the cost of 202 is much lower than 304, so the market has appeared with 202 pretending to be 304, we must know that the 200 series of stainless steel in corrosion resistance and toughness is far worse than the 300 series, if you buy and use the wrong, there will be a lot of hidden trouble.

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How to distinguish between 202 stainless steel and 304 stainless steel

Observation and touch: close observation of the surface of stainless steel, 304 stainless steel color saturation bright, 202 stainless steel color dark, color saturation is low "touch feeling, 304 feel smooth, 202 feel a little rough. Chemical identification method: buy professional stainless steel material identification potion, drop on the surface of stainless steel, by showing the color contrast color card, to determine the stainless steel material.

Friction spark identification method: stainless steel on the high-speed turn of the sander for friction, stainless steel friction produced by the spark will be due to the composition of different trace elements and differences, can be different from the number of sparks, shape bifurcation to identify the approximate content of the chemical composition, of course, this method requires a certain number of conditions and professional skills, non-professionals are still recommended to choose the method of observation and touch and chemical identification.

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Many people are concerned about whether 202 stainless steel will rust, in fact, whether stainless steel rust, mainly by the formation of chromium-nickel oxide film is determined by the oxide film to avoid rusting by isolating the oxygen.202 stainless steel to manganese instead of nickel, nickel content is low, so the corrosion resistance is poor, in the use of the use of the scene to pay attention to, to avoid sharp things bumping, scraping, to prevent the surface of the oxide film is damaged. About 202 stainless steel, do you understand now? Concerned about WUXI XINSHANHU STEEL CO., LTD., we continue to update you more stainless steel industry dry goods.