300 series, chrome-nickel: such as 304, 321, 316, 310, etc., 200 is a low-nickel cheap and economical stainless steel, also austenite.
400 series, such as 430, 420, 410, etc.; austenitic type is non-magnetic or weak magnetic, martensite or ferrite is magnetic.
Hardware products should consider his rust, hardness, processing properties, etc. 201 202 301 304 316 has improved rust and heat resistance. 202 304 316 corresponding density: 7.74 7.93 7.98. 316 stainless steel plate is the US standard under the grade, belonging to stainless steel, heat-resistant, corrosion-resistant steel, is austenitic stainless steel, is better than 304 stainless steel, for the national standard (GB) It is 0Cr17Ni12Mo2.
Commonly used stainless steel sheets are available in 201 and 304 models, but only in different compositions.
Among them, 304 stainless steel plate is the most widely used as stainless steel heat-resistant steel, and is austenitic stainless steel. The 400 series is martensitic stainless steel.
No. 304 stainless steel is not magnetic, and the 400 series is magnetic. However, some No. 304 why the magnet can be sucked up, because the magnet can feel the micro-magnetic is no problem. Compared with the 400 series, the 304 nickel content is high, about 8-10%.
400 series stainless steel, this kind of stainless steel internal structure is tempered martensite, with magnetic permeability, can be attracted by magnets.
Austenitic stainless steel has non-magnetic properties, and its typical representative is 304 stainless steel. However, such stainless steel can not obtain high strength by heat treatment. Non-magnetic austenitic stainless steel can not be improved by heat treatment. The strength, non-magnetic austenitic stainless steel is not used to make the body, only for the shank, the holder and so on. Therefore, it is not easy to use whether or not there is magnetism to indicate whether it is stainless steel.
The 400 series stainless steel has a lower chromium content than the 300 series stainless steel, but it does not have carbon deposition problems like the 300 series, and it can be heat treated and can be used in a working environment with a high temperature of one thousand two. Increase its hardness.
400 series of ferritic and martensitic stainless steel. For example, 410 is a kind of 400 series stainless steel. Generally speaking, 304 will be better than rust and corrosion. Some special places 410 are better than 304. For example, some require higher hardness but do not need good rust resistance. Corrosion resistance So 410 will be much better 400 series of stainless steel can be improved by heat treatment. Now the tableware is generally used in the 400 series for the lower end of the product 304 for higher end products.
300 Series - Chromium - Nickel Austenitic Stainless Steel
Model 301—Good ductility for forming products. It can also be hardened by mechanical processing. Good weldability. Wear resistance and fatigue strength are better than 304 stainless steel.
Model 302—Corrosion resistance is the same as 304, because the carbon content is relatively high and the strength is better.
Model 303—It is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
Model 304—Universal model; ie 18/8 stainless steel. The GB grade is 0Cr18Ni9.
Model 309 - Better temperature resistance than 304.
Model 316—After 304, the second most widely used steel grade is used primarily in the food industry and surgical equipment, adding molybdenum to give it a special structure that resists corrosion. It is also used as "ship steel" because it has better resistance to chloride corrosion than 304. SS316 is commonly used in nuclear fuel recovery units. 18/10 grade stainless steel also generally meets this application level.
Model 321—except for the addition of titanium to reduce the risk of weld corrosion in the material, the performance is similar to 304.
400 Series - Ferritic and Martensitic Stainless Steel
Model 408—Good heat resistance, weak corrosion resistance, 11% Cr, and 8% Ni.
Model 409—The cheapest model (British and American), usually used as a car exhaust pipe, is a ferritic stainless steel.
Model 410—Martensite (high-strength chrome steel) with good wear resistance and poor corrosion resistance.
Model 416—Addition of sulfur improves the processing properties of the material.We are erw tube mill manufacturer,you can know it.
Model 420 - "cutting grade" martensitic steel, similar to the earliest stainless steel of Brinell high chromium steel. Also used for surgical knives, it can be done very brightly.
Model 430 - Ferritic stainless steel, for decoration, for example for automotive accessories. Good formability, but poor temperature resistance and corrosion resistance.
Model 440—High-strength cutting tool steel with slightly higher carbon content. After proper heat treatment, it can obtain higher yield strength and hardness of 58HRC, which is among the hardest stainless steel. The most common application example is the "razor blade." There are three commonly used models: 440A, 440B, 440C, and 440F.
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